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arXiv 2020年

作者： Hashim, Akel Naik, Ravi K. Morvan, Alexis Ville, Jean-Loup Mitchell, Bradley Kreikebaum, John Mark Davis, Marc Smith, Ethan Iancu, Costin O'Brien, Kevin P. Hincks, Ian Wallman, Joel J. Emerson, Joseph Siddiqi, Irfan Quantum Nanoelectronics Laboratory Department of Physics University of California at Berkeley BerkeleyCA94720 United States Graduate Group in Applied Science and Technology University of California at Berkeley BerkeleyCA94720 United States Computational Research Division Lawrence Berkeley National Lab BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Lab BerkeleyCA94720 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA United States Quantum Benchmark Inc. KitchenerONN2H 5G5 Canada Institute for Quantum Computing and Department of Applied Mathematics University of Waterloo WaterlooONN2L 3G1 Canada

The successful implementation of algorithms on quantum processors relies on the accurate control of quantum bits (qubits) to perform logic gate operations. In this era of noisy intermediate-scale quantum (NISQ) computing, systematic miscalibrations, drift, and crosstalk in the control of qubits can lead to a coherent form of error which has no classical analog. Coherent errors severely limit the performance of quantum algorithms in an unpredictable manner, and mitigating their impact is necessary for realizing reliable quantum computations. Moreover, the average error rates measured by randomized benchmarking and related protocols are not sensitive to the full impact of coherent errors, and therefore do not reliably predict the global performance of quantum algorithms, leaving us unprepared to validate the accuracy of future large-scale quantum computations. Randomized compiling is a protocol designed to overcome these performance limitations by converting coherent errors into stochastic noise, dramatically reducing unpredictable errors in quantum algorithms and enabling accurate predictions of algorithmic performance from error rates measured via cycle benchmarking. In this work, we demonstrate significant performance gains under randomized compiling for the four-qubit quantum Fourier transform algorithm and for random circuits of variable depth on a superconducting quantum processor. Additionally, we accurately predict algorithm performance using experimentally-measured error rates. Our results demonstrate that randomized compiling can be utilized to leverage and predict the capabilities of modern-day noisy quantum processors, paving the way forward for scalable quantum computing. Copyright © 2020, The Authors. All rights reserved.

关键词： Benchmarking

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Selective dynamical imaging of interferometric data

arXiv

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arXiv 2024年

作者： Farah, Joseph Galison, Peter Akiyama, Kazunori Bouman, Katherine L. Bower, Geoffrey C. Chael, Andrew Fuentes, Antonio Gómez, José L. Honma, Mareki Johnson, Michael D. Kofuji, Yutaro Marrone, Daniel P. Moriyama, Kotaro Narayan, Ramesh Pesce, Dominic W. Tiede, Paul Wielgus, Maciek Zhao, Guang-Yao Alberdi, Antxon Alef, Walter Algaba, Juan Carlos Anantua, Richard Asada, Keiichi Azulay, Rebecca Bach, Uwe Baczko, Anne-Kathrin Ball, David Baloković, Mislav Barrett, John Bauböck, Michi Benson, Bradford A. Bintley, Dan Blackburn, Lindy Blundell, Raymond Boland, Wilfred Boyce, Hope Bremer, Michael Brinkerink, Christiaan D. Brissenden, Roger Britzen, Silke Broderick, Avery E. Broguiere, Dominique Bronzwaer, Thomas Bustamante, Sandra Byun, Do-Young Carlstrom, John E. Ceccobello, Chiara Chan, Chi-Kwan Chatterjee, Koushik Chatterjee, Shami Chen, Ming-Tang Chen, Yongjun Cho, Ilje Christian, Pierre Conroy, Nicholas S. Conway, John E. Cordes, James M. Crawford, Thomas M. Crew, Geoffrey B. Cruz-Osorio, Alejandro Cui, Yuzhu Davelaar, Jordy De Laurentis, Mariafelicia Deane, Roger Dempsey, Jessica Desvignes, Gregory Doeleman, Sheperd S. Dhruv, Vedant Dzib Quijano, Sergio Abraham Eatough, Ralph P. Emami, Razieh Falcke, Heino Fish, Vincent L. Fomalont, Ed Ford, H. Alyson Fraga-Encinas, Raquel Freeman, William T. Friberg, Per Fromm, Christian M. Gammie, Charles F. García, Roberto Gentaz, Olivier Georgiev, Boris Goddi, Ciriaco Gold, Roman Gómez-Ruiz, Arturo I. Gu, Minfeng Gurwell, Mark Hada, Kazuhiro Haggard, Daryl Hecht, Michael H. Hesper, Ronald Ho, Luis C. Ho, Paul Huang, Chih-Wei L. Huang, Lei Hughes, David H. Ikeda, Shiro Impellizzeri, C.M. Violette Inoue, Makoto Issaoun, Sara James, David J. Jannuzi, Buell T. Janssen, Michael Jeter, Britton Jiang, Wu Jimenez-Rosales, Alejandra Jorstad, Svetlana Joshi, Abhishek V. Jung, Taehyun Karami, Mansour Karuppusamy, Ramesh Kawashima, Tomohisa Keating, Garrett K. Kettenis, Mark Kim, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kino, Motoki Koay, Jun Yi Kocherlakota, Prashant Koch, Patrick Las Cumbres Observatory 6740 Cortona Drive Suite 102 GoletaCA93117-5575 United States Department of Physics University of California Santa BarbaraCA93106-9530 United States Black Hole Initiative Harvard University 20 Garden Street CambridgeMA02138 United States Department of History of Science Harvard University CambridgeMA02138 United States Department of Physics Harvard University CambridgeMA02138 United States Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Center for Astrophysics — Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States California Institute of Technology 1200 East California Boulevard PasadenaCA91125 United States Institute of Astronomy and Astrophysics Academia Sinica 645 N. A’ohoku Place HiloHI96720 United States Princeton Center for Theoretical Science Princeton University Jadwin Hall PrincetonNJ08544 United States NASA Hubble Fellowship Program Einstein Fellow United States Instituto de Astrofísica de Andalucía CSIC Glorieta de la Astronomía s/n GranadaE-18008 Spain Mizusawa VLBI Observatory National Astronomical Observatory of Japan 2-12 Hoshigaoka Mizusawa Iwate Oshu023-0861 Japan 2-21-1 Osawa Tokyo Mitaka181-8588 Japan Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Steward Observatory Department of Astronomy University of Arizona 933 N. Cherry Ave. TucsonAZ85721 United States Department of Physics and Astronomy University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada Waterloo Centre for Astrophysics University of Waterloo WaterlooONN2L 3G1 Canada Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany Department of Physics Faculty of Science Universiti Malaya Kuala Lumpur50603 Malaysia Department of Physics & Ast

Recent developments in very-long-baseline interferometry (VLBI) have made it possible for the Event Horizon Telescope (EHT) to resolve the innermost accretion flows of the largest supermassive black holes on the sky. The sparse nature of the EHT’s (u, v) coverage presents a challenge when attempting to resolve highly time-variable sources. We demonstrate that the changing (u, v) coverage of the EHT can contain regions of time over the course of a single observation that facilitate dynamical imaging. These optimal time regions typically have projected baseline distributions that are approximately angularly isotropic and radially homogeneous. We derive a metric of coverage quality based on baseline isotropy and density that is capable of ranking array configurations by their ability to produce accurate dynamical reconstructions. We compare this metric to existing metrics in the literature, and investigate their utility by performing dynamical reconstructions on synthetic data from simulated EHT observations of sources with simple orbital variability. We then use these results to make recommendations for imaging the 2017 EHT Sgr A∗ dataset. © 2024, CC BY.

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High-Energy-Density Foldable Battery Enabled by Zigzag-Like Design

High-Energy-Density Foldable Battery Enabled by Zigzag-Like ...

引用

中国力学大会（CCTAM 2019）

作者： Xiangbiao Liao Changmin Shi Tianyang Wang Boyu Qie Youlong Chen Pengfei Yang Qian Cheng Haowei Zhai Meijie Chen Xue Wang Xi Chen Yuan Yang Yonghong Zhang Family Center for Advanced Materials for Energy and Environment Department of Earth and Environmental Engineering Columbia University Program of Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University School of Aerospace Xi’an Jiaotong University School of Energy Science and Engineering Harbin Institute of Technology School of Astronautics Harbin Institute of Technology

Flexible batteries, seamlessly compatible with flexible and wearable electronics, attract a great deal of research attention. Current designs of flexible batteries struggle to meet one of the most extreme yet common d... 详细信息

关键词： energy density flexible foldable lithium ion batteries nonflammable

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General Relativistic Cosmological N-body Simulations I: time integration

arXiv

引用

arXiv 2019年

作者： Daverio, David Dirian, Yves Mitsou, Ermis Centre for Theoretical Cosmology Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Road CambridgeCB3 0WA United Kingdom Center for Theoretical Astrophysics and Cosmology Institute for Computational Science University of Zürich ZürichCH–8057 Switzerland

This is the first in a series of papers devoted to fully general-relativistic N-body simulations applied to late-time cosmology. The purpose of this paper is to present the combination of a numerical relativity scheme, discretization method and time-integration algorithm that provides satisfyingly stable evolution. More precisely, we show that it is able to pass a robustness test and to follow scalar linear modes around an expanding homogeneous and isotropic space-time. Most importantly, it is able to evolve typical cosmological initial conditions on comoving scales down to tenths of megaparsecs with controlled constraint and energy-momentum conservation violations all the way down to the regime of strong inhomogeneity. Copyright © 2019, The Authors. All rights reserved.

关键词： Cosmology

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Nonlinear schrödinger equation with coulomb potential

arXiv

引用

arXiv 2018年

作者： MIAO, CHANGXING ZHANG, JUNYONG ZHENG, JIQIANG Institute of Applied Physics and Computational Mathematics Beijing100088 China Department of Mathematics Beijing Institute of Technology Beijing100081 China Department of Mathematics Cardiff University United Kingdom

In this paper, we study the Cauchy problem for the nonlinear Schrödinger equations with Coulomb potential i∂tu + Δu + K |x| u = λ|u|p-1u with 1 0 and scattering theory when the Coulomb potential is repulsive i.e. K ≤ 0. The argument is based on the interaction Morawetz-type inequalities and the equivalence of Sobolev norms. Copyright © 2018, The Authors. All rights reserved.

关键词： Nonlinear equations

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Constraining the Baryonic Feedback with Cosmic Shear Using the DES Year-3 Small-Scale Measurements

arXiv

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arXiv 2022年

作者： Chen, Angela Aricò, G. Huterer, D. Angulo, R. Weaverdyck, N. Friedrich, O. Secco, L.F. Hernández-Monteagudo, C. Alarcon, A. Alves, O. Amon, A. Andrade-Oliveira, F. Baxter, E. Bechtol, K. Becker, M.R. Bernstein, G.M. Blazek, J. Brandao-Souza, A. Bridle, S.L. Camacho, H. Campos, A. Carnero Rosell, A. Carrasco Kind, M. Cawthon, R. Chang, C. Chen, R. Chintalapati, P. Choi, A. Cordero, J. Crocce, M. Pereira, M.E.S. Davis, C. DeRose, J. Di Valentino, E. Diehl, H.T. Dodelson, S. Doux, C. Drlica-Wagner, A. Eckert, K. Eifler, T.F. Elsner, F. Elvin-Poole, J. Everett, S. Fang, X. Ferté, A. Fosalba, P. Gatti, M. Gaztanaga, E. Giannini, G. Gruen, D. Gruendl, R.A. Harrison, I. Hartley, W.G. Herner, K. Hoffmann, K. Huang, H. Huff, E.M. Jain, B. Jarvis, M. Jeffrey, N. Kacprzak, T. Krause, E. Kuropatkin, N. Leget, P.-F. Lemos, P. Liddle, A.R. MacCrann, N. McCullough, J. Muir, J. Myles, J. Navarro-Alsina, A. Omori, Y. Pandey, S. Park, Y. Porredon, A. Prat, J. Raveri, M. Refregier, A. Rollins, R.P. Roodman, A. Rosenfeld, R. Ross, A.J. Rykoff, E.S. Samuroff, S. Sánchez, C. Sanchez, J. Sevilla-Noarbe, I. Sheldon, E. Shin, T. Troja, A. Troxel, M.A. Tutusaus, I. Varga, T.N. Wechsler, R.H. Yanny, B. Yin, B. Zhang, Y. Zuntz, J. Aguena, M. Annis, J. Bacon, D. Bertin, E. Bocquet, S. Brooks, D. Burke, D.L. Carretero, J. Conselice, C. Costanzi, M. da Costa, L.N. De Vicente, J. Desai, S. Doel, P. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gerdes, D.W. Giannantonio, T. Gschwend, J. Gutierrez, G. Hinton, S.R. Hollowood, D.L. Honscheid, K. James, D.J. Kuehn, K. Lahav, O. March, M. Marshall, J.L. Melchior, P. Menanteau, F. Miquel, R. Mohr, J.J. Morgan, R. Paz-Chinchón, F. Pieres, A. Sanchez, E. Smith, M. Suchyta, E. Tarle, G. Thomas, D. To, C. Department of Physics University of Michigan Ann ArborMI48109 United States UTIAS The University of Tokyo Chiba Kashiwa277-8583 Japan Institute for Computational Science University of Zurich Winterthurerstrasse 190 Zurich8057 Switzerland Paseo Manuel de Lardizabal 4 Guipuzkoa Donostia-San Sebastián20018 Spain Departamento de Física Universidad de Zaragoza Pedro Cerbuna 12 Zaragoza50009 Spain IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States Kavli Institute for Cosmology University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Department of Astrophysics Research Instituto de Astrofísica de Canarias CVía Láctea sn Tenerife La LagunaE-38205 Spain Departamento de Astrofísica Universidad de La Laguna Avenida Francisco Sánchez sn Tenerife La LagunaE-38205 Spain Argonne National Laboratory 9700 South Cass Avenue Lemont IL60439 United States Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 RJ Rio de Janeiro20921-400 Brazil Kavli Institute for Particle Astrophysics & Cosmology Stanford University P. O. Box 2450 StanfordCA94305 United States Institute for Astronomy University of Hawai’i 2680 Woodlawn Drive HonoluluHI96822 United States Physics Department University of Wisconsin-Madison 2320 Chamberlin Hall 1150 University Avenue MadisonWI53706-1390 United States Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States Department of Physics Northeastern University BostonMA02115 United States Observatoire de Sauverny Versoix 1290 Switzerland Instituto de Física Gleb Wataghin Universidade Estadual de Campinas Campinas SP 13083-859 Brazil Jodrell Bank Center for Astrophysics School of Physics and Astronomy University of Manchester Oxford Road Manc

We use the small scales of the Dark Energy Survey (DES) Year-3 cosmic shear measurements, which are excluded from the DES Year-3 cosmological analysis, to constrain the baryonic feedback. To model the baryonic feedback, we adopt a baryonic correction model and use the numerical package Baccoemu to accelerate the evaluation of the baryonic nonlinear matter power spectrum. We design our analysis pipeline to focus on the constraints of the baryonic suppression effects, utilizing the implication given by a principal component analysis on the Fisher forecasts. Our constraint on the baryonic effects can then be used to better model and ameliorate the effects of baryons in producing cosmological constraints from the next generation large-scale structure surveys. We detect the baryonic suppression on the cosmic shear measurements with a ∼ 2σ significance. The characteristic halo mass for which half of the gas is ejected by baryonic feedback is constrained to be Mc > 1013.2h−1Mo (95% C.L.). The best-fit baryonic suppression is ∼ 5% at k = 1.0Mpc h−1 and ∼ 15% at k = 5.0Mpc h−1. Our findings are robust with respect to the assumptions about the cosmological parameters, specifics of the baryonic model, and intrinsic alignments. Copyright © 2022, The Authors. All rights reserved.

关键词： Principal component analysis

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Large Shape Staggering in Neutron-Deficient Bi Isotopes

引用

Physical Review Letters 2021年第19期127卷 192501-192501页

作者： A. Barzakh A. N. Andreyev C. Raison J. G. Cubiss P. Van Duppen S. Péru S. Hilaire S. Goriely B. Andel S. Antalic M. Al Monthery J. C. Berengut J. Bieroń M. L. Bissell A. Borschevsky K. Chrysalidis T. E. Cocolios T. Day Goodacre J.-P. Dognon M. Elantkowska E. Eliav G. J. Farooq-Smith D. V. Fedorov V. N. Fedosseev L. P. Gaffney R. F. Garcia Ruiz M. Godefroid C. Granados R. D. Harding R. Heinke M. Huyse J. Karls P. Larmonier J. G. Li (李冀光) K. M. Lynch D. E. Maison B. A. Marsh P. Molkanov P. Mosat A. V. Oleynichenko V. Panteleev P. Pyykkö M. L. Reitsma K. Rezynkina R. E. Rossel S. Rothe J. Ruczkowski S. Schiffmann C. Seiffert M. D. Seliverstov S. Sels L. V. Skripnikov M. Stryjczyk D. Studer M. Verlinde S. Wilman A. V. Zaitsevskii Petersburg Nuclear Physics Institute NRC Kurchatov Institute 188300 Gatchina Russia Department of Physics University of York York YO10 5DD United Kingdom Advanced Science Research Center Japan Atomic Energy Agency Tokai-mura Ibaraki 319-1195 Japan KU Leuven Instituut voor Kern- en Stralingsfysica B-3001 Leuven Belgium Université Paris-Saclay CEA LMCE 91680 Bruyères-le-Châtel France Institut d’Astronomie et d’Astrophysique CP-226 Université Libre de Bruxelles 1050 Brussels Belgium Department of Nuclear Physics and Biophysics Comenius University in Bratislava 84248 Bratislava Slovakia School of Physics University of New South Wales Sydney NSW 2052 Australia Instytut Fizyki Teoretycznej Uniwersytet Jagielloński ul. prof. Stanisława Łojasiewicza 11 Kraków Poland School of Physics and Astronomy The University of Manchester Manchester M13 9PL United Kingdom Van Swinderen Institute University of Groningen 9747 Groningen Netherlands CERN Esplanade des Particules 1 1211 Geneva 23 Switzerland Institut für Physik Johannes Gutenberg-Universität Mainz D-55128 Mainz Germany TRIUMF 4004 Wesbrook Mall Vancouver British Columbia V6T 2A3 Canada NIMBE CEA CNRS Universiteé Paris-Saclay CEA Saclay 91190 Gif-sur-Yvette France Poznan University of Technology Piotrowo 3 Poznan 60-965 Poland School of Chemistry Tel Aviv University 69978 Tel Aviv Israel School of Engineering and Computing University of the West of Scotland Paisley PA1 2BE United Kingdom SQUARES CP160/09 Université libre de Bruxelles Av. F.D. Roosevelt 50 1050 Brussels Belgium Department of Physics University of Gothenburg SE-412 96 Gothenburg Sweden Institute of Applied Physics and Computational Mathematics Beijing 100088 China Saint Petersburg State University 7/9 Universitetskaya nab. St. Petersburg 199034 Russia Department of Chemistry M. V. Lomonosov Moscow State University Leninskie gory 1/3 Moscow 119991 Russia Department of Chemistry University of Helsinki P.O. Box 55 (A. I. Virtasen a

The changes in the mean-square charge radius (relative to Bi209), magnetic dipole, and electric quadrupole moments of Bi187,188,189,191 were measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). A large staggering in radii was found in Bi187,188,189g, manifested by a sharp radius increase for the ground state of Bi188 relative to the neighboring Bi187,189g. A large isomer shift was also observed for Bi188m. Both effects happen at the same neutron number, N=105, where the shape staggering and a similar isomer shift were observed in the mercury isotopes. Experimental results are reproduced by mean-field calculations where the ground or isomeric states were identified by the blocked quasiparticle configuration compatible with the observed spin, parity, and magnetic moment.

关键词： Nuclear charge distribution Nuclear density functional theory Nuclear spin & parity Nuclear structure & decays Spectroscopic factors & electromagnetic moments

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Configurational entropy of magnetic skyrmions as an ideal gas

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Physical Review B 2019年第17期99卷 174440-174440页

作者： R. Zivieri R. Tomasello O. Chubykalo-Fesenko V. Tiberkevich M. Carpentieri G. Finocchio Department of Mathematical and Computer Sciences Physical Sciences and Earth Sciences University of Messina 98166 Messina Italy Institute of Applied and Computational Mathematics Foundation for Research and Technology GR 700 13 Heraklion Crete Greece Instituto de Ciencia de Materiales de Madrid CSIC Cantoblanco 28049 Madrid Spain Department of Physics Oakland University Rochester Michigan 48309 USA Department of Electrical and Information Engineering Politecnico di Bari 70125 Bari Italy

The study of thermodynamics of topological defects is an important challenge to understand their underlying physics. Among them, magnetic skyrmions have a leading role for their physical properties and potential applications in storage and neuromorphic computing. In this paper, the thermodynamic statistics of magnetic skyrmions is derived. It is shown that the skyrmion free energy can be modeled via a parabolic function and the diameters statistics obeys the Maxwell-Boltzmann distribution. This allows for making an analogy between the behavior of the distribution of skyrmion diameters statistics and the diluted gas Maxwell-Boltzmann molecules distribution of velocities at thermodynamic equilibrium. The calculation of the skyrmion configurational entropy, due to thermally induced changes of size and shape of the skyrmion, is essential for the determination of thermal fluctuations of the skyrmion energy around its average value. These results can be employed to advance the field of skyrmionics.

关键词： Micromagnetism Skyrmions Spintronics Ferromagnets Thin films Landau-Lifschitz-Gilbert equation Micromagnetic modeling

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Thermally Radiative Casson Fluid Flow over a Cylinder with Newtonian Heating and Heat generation/absorption

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Journal of physics: Conference Series 2021年第2期1964卷

作者： K Loganathan M Sivakumar M Mohanraj P Sakthivel Research and Development Wing Live4Research Tiruppur 638 106 Tamil Nadu India Department of Applied Mathematics and Computational Science PSG College of Technology Coimbatore 641 004 Tamil Nadu India Department of Mechanical Engineering Hindusthan College of Engineering and Technology Coimbatore Tamil Nadu 641 032 India Department of Physics Faculty of Engineering Karpagam Academy of Higher Education Coimbatore Tamil Nadu 641 021 India

This communication explains the impact of thermally radiative flow of a Casson fluid over a cylinder with velocity slip, suction/injection, and Newtonian heating condition. The governing PDE expressions are remodeled into an ODE expressing by applying suitable variables. The homotopy analysis (HAM) technique was implemented for solving our models. The impact of velocity field, temperature distribution, skin friction coefficient, Nusselt number in terms of diverse physical parameters like Casson parameter, suction/injection parameter, Newtonian heating parameter, radiation parameters, heat generation/absorption, Hartmann number and velocity slip parameter. The Hartmann number leads to slow down the fluid velocity, skin friction coefficient and local Nusselt number. The slip parameter decreases the fluid velocity and enhance the fluid heat transfer gradient.

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Chemical abundances of the young inner-disk open cluster NGC 6705 observed by APOGEE: sodium-rich and not α-enhanced

arXiv

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arXiv 2023年

作者： Loaiza-Tacuri, V. Cunha, K. Souto, D. Smith, V.V. Guerço, R. Chiappini, C. Silva, J.V. Sales Horta, D. Prieto, C. Allende Beaton, R. Bizyaev, D. Daflon, S. Frinchaboy, P. Hasselquist, S. Hayes, C.R. Holtzman, J.A. Jönsson, H. Majewski, S.R. Mészáros, S. Nidever, D.L. Pinsonneault, M. Zasowski, G. Observatório Nacional Rua General José Cristino 77 São Cristóvão RJ Rio de Janeiro20921-400 Brazil Steward Observatory University of Arizona 933 North Cherry Avenue TucsonAZ85721-0065 United States Institut d'Astrophysique de Paris UMR7095 CNRS Sorbonne Université 98bis Bd. Arago Paris75014 France Departamento de Física Universidade Federal de Sergipe Av. Marechal Rondon S/N SE São Cristóvão49000-000 Brazil NSF's NOIRLab 950 N. Cherry Ave TucsonAZ85719 United States An der Sternwarte 16 Potsdam14482 Germany Center for Computational Astrophysics Flatiron Institute 162 Fifth Avenue New YorkNY10010 United States Departamento de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38206 Spain The Observatories of the Carnegie Institution for Science 813 Santa Barbara Street PasadenaCA91101 United States Apache Point Observatory New Mexico State University P.O. Box 59 SunspotNM88349-0059 United States Sternberg Astronomical Institute Moscow State University Moscow Russia Department of Physics & Astronomy Texas Christian University TCU Box 298840 Fort WorthTX76129 United States Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States NRC Herzberg Astronomy and Astrophysics Research Centre 5071 West Saanich Road VictoriaBCV9E 2E7 Canada New Mexico State University Las CrucesNM88003 United States Materials Science and Applied Mathematics Malmö University MalmöSE-205 06 Sweden Department of Astronomy University of Virginia CharlottesvilleVA22904-4325 United States ELTE Eötvös Loránd University Gothard Astrophysical Observatory Szent Imre H. st. 112 Szombathely9700 Hungary MTA-ELTE Lendület "Momentum" Milky Way Research Group Hungary Department of Physics Montana State University P.O. Box 173840 BozemanMT59717-3840 United States Department of Astronomy The Ohio State University ColumbusOH43210 United States Department of Physics and Astronomy University of Utah Salt Lake CityUT8

Previous results in the literature have found the young inner-disk open cluster NGC 6705 to be mildly α-enhanced. We examined this possibility via an independent chemical abundance analysis for 11 red-giant members of NGC 6705. The analysis is based on near-infrared APOGEE spectra and relies on LTE calculations using spherical model atmospheres and radiative transfer. We find a mean cluster metallicity of [Fe/H] = +0.13 ± 0.04, indicating that NGC 6705 is metal-rich, as may be expected for a young inner-disk cluster. The mean α-element abundance relative to iron is 〈[α/Fe]〉 = −0.03 ± 0.05, which is not at odds with expectations from general Galactic abundance trends. NGC 6705 also provides important probes for studying stellar mixing, given its turn-off mass of M∼3.3 M☉. Its red giants have low 12C abundances ([12C/Fe]=−0.16) and enhanced 14N abundances ([14N/Fe]=+0.51), which are key signatures of the first dredge-up on the red giant branch. An additional signature of dredge-up was found in the Na abundances, which are enhanced by [Na/Fe]=+0.29, with a very small non-LTE correction. The 16O and Al abundances are found to be near-solar. All of the derived mixing-sensitive abundances are in agreement with stellar models of approximately 3.3 M☉ evolving along the red giant branch and onto the red clump. As found in young open clusters with similar metallicities, NGC 6705 exhibits a mild excess in the s-process element cerium, with [Ce/Fe] = +0.13 ± 0.07. Copyright © 2023, The Authors. All rights reserved.

关键词： Sodium

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