The APO-K2 Catalog:  II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way

Jack T. Warfield; Joel C. Zinn; Jessica Schonhut-Stasik; James W. Johnson; Marc H. Pinsonneault; Jennifer A. Johnson; Dennis Stello; Rachael L. Beaton; Yvonne Elsworth; Rafael A. García; Savita Mathur; Benoît Mosser; Aldo Serenelli; Jamie Tayar

doi:10.3847/1538-3881/ad33bb

The APO-K2 Catalog: II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way

Jack T. Warfield^*, Joel C. Zinn, Jessica Schonhut-Stasik, James W. Johnson, Marc H. Pinsonneault, Jennifer A. Johnson, Dennis Stello, Rachael L. Beaton, Yvonne Elsworth, Rafael A. García, Savita Mathur, Benoît Mosser, Aldo Serenelli, Jamie Tayar

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

71 Downloads (Pure)

Abstract

We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Galactic Evolution Experiment survey. Our sample includes 17 of the 19 fields observed by K2, making it one of the most comprehensive catalogs of accurate stellar ages across the Galaxy in terms of the wide range of populations spanned by its stars, enabling rigorous tests of Galactic chemical evolution models. Taking into account the selection functions of the K2 sample, the data appear to support the age−chemistry morphology of stellar populations predicted by both inside-out and late-burst scenarios. We also investigate trends in age versus stellar chemistry and Galactic position, which are consistent with previous findings. Comparisons against APOKASC-3 asteroseismic ages show agreement to within ∼3%. We also discuss offsets between our ages and spectroscopic ages. Finally, we note that ignoring the effects of α-enhancement on stellar opacity (either directly or with the Salaris metallicity correction) results in an ∼10% offset in age estimates for the most α-enhanced stars, which is an important consideration for continued tests of Galactic models with this and other asteroseismic age samples.

Original language	English
Article number	208
Journal	The Astronomical Journal
Volume	167
Issue number	5
Early online date	10 Apr 2024
DOIs	https://doi.org/10.3847/1538-3881/ad33bb
Publication status	Published - 1 May 2024

Bibliographical note

Acknowledgments
Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions.

SDSS-IV acknowledges support and resources from the Center for High Performance Computing at the University of Utah. The SDSS website is www.sdss.org.

SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration, including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, Center for Astrophysics—Harvard & Smithsonian, the Chilean Participation Group, the French Participation Group, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional / MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University.

S.M. acknowledges support by the Spanish Ministry of Science and Innovation with the Ramon y Cajal fellowship No. RYC-2015-17697 and grant No. PID2019-107187GB-I00, and through AEI under the Severo Ochoa Centres of Excellence Programme 2020–2023 (CEX2019-000920-S). D.S. is supported by the Australian Research Council (DP190100666). R.A.G acknowledges the support from the PLATO Centre National D'Études Spatiales grant.

Keywords

Stellar abundances
Stellar ages
Galaxy stellar content
Stellar evolutionary models
Milky Way evolution
Milky Way formation
Asteroseismology
Red giant stars

Access to Document

10.3847/1538-3881/ad33bbLicence: Creative Commons: Attribution (CC BY)

WarfieldJ2024APO-K2.pdfFinal published version, 2.51 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

Warfield, J. T., Zinn, J. C., Schonhut-Stasik, J., Johnson, J. W., Pinsonneault, M. H., Johnson, J. A., Stello, D., Beaton, R. L., Elsworth, Y., García, R. A., Mathur, S., Mosser, B., Serenelli, A., & Tayar, J. (2024). The APO-K2 Catalog: II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way. The Astronomical Journal, 167(5), Article 208. https://doi.org/10.3847/1538-3881/ad33bb

@article{df765d7c54a340529d457f2b33f2de23,

title = "The APO-K2 Catalog: II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way",

abstract = "We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Galactic Evolution Experiment survey. Our sample includes 17 of the 19 fields observed by K2, making it one of the most comprehensive catalogs of accurate stellar ages across the Galaxy in terms of the wide range of populations spanned by its stars, enabling rigorous tests of Galactic chemical evolution models. Taking into account the selection functions of the K2 sample, the data appear to support the age−chemistry morphology of stellar populations predicted by both inside-out and late-burst scenarios. We also investigate trends in age versus stellar chemistry and Galactic position, which are consistent with previous findings. Comparisons against APOKASC-3 asteroseismic ages show agreement to within ∼3%. We also discuss offsets between our ages and spectroscopic ages. Finally, we note that ignoring the effects of α-enhancement on stellar opacity (either directly or with the Salaris metallicity correction) results in an ∼10% offset in age estimates for the most α-enhanced stars, which is an important consideration for continued tests of Galactic models with this and other asteroseismic age samples.",

keywords = "Stellar abundances, Stellar ages, Galaxy stellar content, Stellar evolutionary models, Milky Way evolution, Milky Way formation, Asteroseismology, Red giant stars",

author = "Warfield, {Jack T.} and Zinn, {Joel C.} and Jessica Schonhut-Stasik and Johnson, {James W.} and Pinsonneault, {Marc H.} and Johnson, {Jennifer A.} and Dennis Stello and Beaton, {Rachael L.} and Yvonne Elsworth and Garc{\'i}a, {Rafael A.} and Savita Mathur and Beno{\^i}t Mosser and Aldo Serenelli and Jamie Tayar",

note = "Acknowledgments Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High Performance Computing at the University of Utah. The SDSS website is www.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration, including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, Center for Astrophysics—Harvard & Smithsonian, the Chilean Participation Group, the French Participation Group, Instituto de Astrof{\'i}sica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut f{\"u}r Astrophysik Potsdam (AIP), Max-Planck-Institut f{\"u}r Astronomie (MPIA Heidelberg), Max-Planck-Institut f{\"u}r Astrophysik (MPA Garching), Max-Planck-Institut f{\"u}r Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observat{\'a}rio Nacional / MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Aut{\'o}noma de M{\'e}xico, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University. S.M. acknowledges support by the Spanish Ministry of Science and Innovation with the Ramon y Cajal fellowship No. RYC-2015-17697 and grant No. PID2019-107187GB-I00, and through AEI under the Severo Ochoa Centres of Excellence Programme 2020–2023 (CEX2019-000920-S). D.S. is supported by the Australian Research Council (DP190100666). R.A.G acknowledges the support from the PLATO Centre National D'{\'E}tudes Spatiales grant.",

year = "2024",

month = may,

day = "1",

doi = "10.3847/1538-3881/ad33bb",

language = "English",

volume = "167",

journal = "The Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5",

}

Warfield, JT, Zinn, JC, Schonhut-Stasik, J, Johnson, JW, Pinsonneault, MH, Johnson, JA, Stello, D, Beaton, RL, Elsworth, Y, García, RA, Mathur, S, Mosser, B, Serenelli, A & Tayar, J 2024, 'The APO-K2 Catalog: II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way', The Astronomical Journal, vol. 167, no. 5, 208. https://doi.org/10.3847/1538-3881/ad33bb

TY - JOUR

T1 - The APO-K2 Catalog

T2 - II. Accurate Stellar Ages for Red Giant Branch Stars across the Milky Way

AU - Warfield, Jack T.

AU - Zinn, Joel C.

AU - Schonhut-Stasik, Jessica

AU - Johnson, James W.

AU - Pinsonneault, Marc H.

AU - Johnson, Jennifer A.

AU - Stello, Dennis

AU - Beaton, Rachael L.

AU - Elsworth, Yvonne

AU - García, Rafael A.

AU - Mathur, Savita

AU - Mosser, Benoît

AU - Serenelli, Aldo

AU - Tayar, Jamie

N1 - Acknowledgments Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High Performance Computing at the University of Utah. The SDSS website is www.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration, including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, Center for Astrophysics—Harvard & Smithsonian, the Chilean Participation Group, the French Participation Group, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional / MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University. S.M. acknowledges support by the Spanish Ministry of Science and Innovation with the Ramon y Cajal fellowship No. RYC-2015-17697 and grant No. PID2019-107187GB-I00, and through AEI under the Severo Ochoa Centres of Excellence Programme 2020–2023 (CEX2019-000920-S). D.S. is supported by the Australian Research Council (DP190100666). R.A.G acknowledges the support from the PLATO Centre National D'Études Spatiales grant.

PY - 2024/5/1

Y1 - 2024/5/1

N2 - We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Galactic Evolution Experiment survey. Our sample includes 17 of the 19 fields observed by K2, making it one of the most comprehensive catalogs of accurate stellar ages across the Galaxy in terms of the wide range of populations spanned by its stars, enabling rigorous tests of Galactic chemical evolution models. Taking into account the selection functions of the K2 sample, the data appear to support the age−chemistry morphology of stellar populations predicted by both inside-out and late-burst scenarios. We also investigate trends in age versus stellar chemistry and Galactic position, which are consistent with previous findings. Comparisons against APOKASC-3 asteroseismic ages show agreement to within ∼3%. We also discuss offsets between our ages and spectroscopic ages. Finally, we note that ignoring the effects of α-enhancement on stellar opacity (either directly or with the Salaris metallicity correction) results in an ∼10% offset in age estimates for the most α-enhanced stars, which is an important consideration for continued tests of Galactic models with this and other asteroseismic age samples.

AB - We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic Archaeology Program and elemental abundances from the Apache Point Galactic Evolution Experiment survey. Our sample includes 17 of the 19 fields observed by K2, making it one of the most comprehensive catalogs of accurate stellar ages across the Galaxy in terms of the wide range of populations spanned by its stars, enabling rigorous tests of Galactic chemical evolution models. Taking into account the selection functions of the K2 sample, the data appear to support the age−chemistry morphology of stellar populations predicted by both inside-out and late-burst scenarios. We also investigate trends in age versus stellar chemistry and Galactic position, which are consistent with previous findings. Comparisons against APOKASC-3 asteroseismic ages show agreement to within ∼3%. We also discuss offsets between our ages and spectroscopic ages. Finally, we note that ignoring the effects of α-enhancement on stellar opacity (either directly or with the Salaris metallicity correction) results in an ∼10% offset in age estimates for the most α-enhanced stars, which is an important consideration for continued tests of Galactic models with this and other asteroseismic age samples.

KW - Stellar abundances

KW - Stellar ages

KW - Galaxy stellar content

KW - Stellar evolutionary models

KW - Milky Way evolution

KW - Milky Way formation

KW - Asteroseismology

KW - Red giant stars

U2 - 10.3847/1538-3881/ad33bb

DO - 10.3847/1538-3881/ad33bb

M3 - Article

SN - 0004-6256

VL - 167

JO - The Astronomical Journal

JF - The Astronomical Journal

IS - 5

M1 - 208

ER -