TY - JOUR
T1 - The Open Cluster Chemical Abundances and Mapping Survey. VII. APOGEE DR17 [C/N]-Age Calibration
AU - Spoo, Taylor
AU - Tayar, Jamie
AU - Frinchaboy, Peter M.
AU - Cunha, Katia
AU - Myers, Natalie
AU - Donor, John
AU - Majewski, Steven R.
AU - Bizyaev, Dmitry
AU - García-Hernández, D. A.
AU - Jönsson, Henrik
AU - Lane, Richard R.
AU - Pan, Kaike
AU - Longa-Peña, Penélope
AU - Roman-Lopes, A.
N1 - Funding Information:
T.S., P.M.F., N.M., and J.D. acknowledge support for this research from the National Science Foundation (AST-1715662). J.T. and P.M.F. acknowledge this work was performed at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611. J.T. acknowledges support for this work was provided by NASA through the NASA Hubble Fellowship grant No. 51424 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555 and was supported in part by the National Science Foundation under grant No. NSF PHY-1748958. K.C. acknowledges support for this research from the National Science Foundation (AST-0907873). S.R.M. acknowledges support from National Science Foundation award AST-1908331. D.A.G.H. acknowledges support from the State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU) and the European Regional Development Fund (FEDER) under grant AYA2017-88254-P.
Funding Information:
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.
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022
Y1 - 2022
N2 - Large-scale surveys open the possibility to investigate Galactic evolution both chemically and kinematically; however, reliable stellar ages remain a major challenge. Detailed chemical information provided by high-resolution spectroscopic surveys of the stars in clusters can be used as a means to calibrate recently developed chemical tools for age-dating field stars. Using data from the Open Cluster Abundances and Mapping survey, based on the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment 2 survey, we derive a new empirical relationship between open cluster stellar ages and the carbon-to-nitrogen ([C/N]) abundance ratios for evolved stars, primarily those on the red giant branch. With this calibration, [C/N] can be used as a chemical clock for evolved field stars to investigate the formation and evolution of different parts of our Galaxy. We explore how mixing effects at different stellar evolutionary phases, like the red clump, affect the derived calibration. We have established the [C/N]-age calibration for APOGEE Data Release 17 (DR17) giant star abundances to be log[Age(yr)]DR17=10.14(±0.08)+2.23(±0.19)[C/N], usable for 8.62≤log(Age[yr])≤9.82, derived from a uniform sample of 49 clusters observed as part of APOGEE DR17 applicable primarily to metal-rich, thin- and thick-disk giant stars. This measured [C/N]-age APOGEE DR17 calibration is also shown to be consistent with asteroseismic ages derived from Kepler photometry.
AB - Large-scale surveys open the possibility to investigate Galactic evolution both chemically and kinematically; however, reliable stellar ages remain a major challenge. Detailed chemical information provided by high-resolution spectroscopic surveys of the stars in clusters can be used as a means to calibrate recently developed chemical tools for age-dating field stars. Using data from the Open Cluster Abundances and Mapping survey, based on the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment 2 survey, we derive a new empirical relationship between open cluster stellar ages and the carbon-to-nitrogen ([C/N]) abundance ratios for evolved stars, primarily those on the red giant branch. With this calibration, [C/N] can be used as a chemical clock for evolved field stars to investigate the formation and evolution of different parts of our Galaxy. We explore how mixing effects at different stellar evolutionary phases, like the red clump, affect the derived calibration. We have established the [C/N]-age calibration for APOGEE Data Release 17 (DR17) giant star abundances to be log[Age(yr)]DR17=10.14(±0.08)+2.23(±0.19)[C/N], usable for 8.62≤log(Age[yr])≤9.82, derived from a uniform sample of 49 clusters observed as part of APOGEE DR17 applicable primarily to metal-rich, thin- and thick-disk giant stars. This measured [C/N]-age APOGEE DR17 calibration is also shown to be consistent with asteroseismic ages derived from Kepler photometry.
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U2 - 10.3847/1538-3881/ac5d53
DO - 10.3847/1538-3881/ac5d53
M3 - Article
AN - SCOPUS:85130043170
VL - 163
JO - Astronomical Journal
JF - Astronomical Journal
SN - 0004-6256
IS - 5
M1 - 229
ER -