J/AJ/163/229 Open cluster chemical abund. & mapping survey. VII. (Spoo+, 2022)
The Open Cluster Chemical Abundances and Mapping Survey.
VII. APOGEE DR17 [C/N]-Age Calibration.
Spoo T., Tayar J., Frinchaboy P.M., Cunha K., Myers N., Donor J.,
Majewski S.R., Bizyaev D., Garcia-Hernandez D.A., Jonsson H., Lane R.R.,
Pan K., Longa-Pena P., Roman-Lopes A.
<Astron. J., 163, 229 (2022)>
=2022AJ....163..229S 2022AJ....163..229S
ADC_Keywords: Clusters, open; Stars, giant; Abundances; Abundances, [Fe/H];
Effective temperatures; Infrared
Keywords: Open star clusters ; Galactic abundances ; Chemical abundances
; Abundance ratios
Abstract:
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.
Description:
In this work, we use data from the latest, and final, data release of
the Apache Point Observatory Galactic Evolution Experiment 2
(APOGEE-2) survey. The APOGEE-2 DR17 includes all observations from
both APOGEE spectrographs taken from 2011 August to 2021 January and
has ∼734000 stars. A full description of the APOGEE DR17 data quality
and parameter limitations will be presented in Abdurro'uf+,
2022ApJS..259...35A 2022ApJS..259...35A and Holtzman+,(2022, in preparation).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 40 75 Mean [C/N] DR17 abundance for full sample
table3.dat 73 535 Full calibration cluster sample stellar data from
APOGEE DR17
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See also:
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)
J/ApJS/221/24 : SDSS-III APOGEE H-band spectral line lists (Shetrone+, 2015)
J/AJ/151/144 : ASPCAP weights for 15 APOGEE chemical elements (Garcia+, 2016)
J/ApJ/832/121 : 4yr RV survey red giant in eclipsing binaries (Gaulme+, 2016)
J/MNRAS/456/3655 : Masses and ages of red giants (Martig+, 2016)
J/ApJ/823/114 : The Cannon; a new approach to determine masses (Ness+, 2016)
J/ApJ/844/102 : KIC star parallaxe from asteroseismology vs Gaia (Huber+, 2017)
J/MNRAS/465/3203 : GALAH observational overview (Martell+, 2017)
J/AJ/156/142 : Precision cluster abund. APOGEE using SDSS DR14 (Donor+, 2018)
J/AJ/156/126 : Stellar parameters & abund. BACCHUS analysis (Jonsson+, 2018)
J/ApJS/239/32 : APOKASC-2 catalog of Kepler evolved stars (Pinsonneault+, 2018)
J/ApJ/872/137 : Abundances red clump & RGB stars with APOGEE (Shetrone+, 2019)
J/A+A/634/A34 : Complete line list and solar values (Baratella+, 2020)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/AJ/159/199 : OCCAM. IV. Open cluster abund. using APOGEE DR16 (Donor+, 2020)
J/ApJ/895/52 : EW & chemical abundances in 211 stars with HARPS (Spina+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Cluster name
14- 17 F4.2 [yr] Age [8.35/9.86] log cluster age (1)
19- 24 F6.3 [-] Fe/H [-0.53/0.32] log metallicity
26- 31 F6.3 [-] C/N [-0.71/-0.16] log Carbon to Nitrogen ratio
33- 37 F5.3 [-] e_C/N [0/0.08] Error on C/N
39- 40 I2 --- Memb [1/65] DR17 membership
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Note (1): From Cantat-Gaudin+, 2020, J/A+A/640/A1. Errors are equal to 0.1.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Cluster name
14- 31 A18 --- 2MASS 2MASS identifier
33- 36 I4 K Teff [3515/5341] APOGEE DR17 effective temperature
38- 39 I2 K e_Teff [3/24] Uncertainty in Teff
41- 44 F4.2 [cm/s2] logg [0.76/3.29] APOGEE DR17 Surface Gravity
46- 49 F4.2 [cm/s2] e_logg [0.02/0.04] Uncertainty in logg
51- 55 F5.2 [Sun] [Fe/H] [-0.55/0.41] APOGEE DR17 [Fe/H]
57- 60 F4.2 [Sun] e_[Fe/H] [0.01] Uncertainty in [Fe/H]
62- 66 F5.2 [Sun] [C/N] [-1.03/0.15] APOGEE DR17 [C/N]
68- 71 F4.2 [Sun] e_[C/N] [0.01/0.05] Uncertainty in [C/N]
73 A1 --- RCflag Red Clump flag (1)
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Note (1): Flags as follows:
Y = identified red clump star using the APOGEE DR17 red clump value-added
catalog (Bovy+, 2014ApJ...790..127B 2014ApJ...790..127B; 133 occurrences).
N = stars not identified as part of the catalog and considered red giant
branch stars (402 occurrences).
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History:
From electronic version of the journal
References:
Donor et al. Paper II : 2018AJ....156..142D 2018AJ....156..142D Cat. J/AJ/156/142
Donor et al. Paper IV : 2020AJ....159..199D 2020AJ....159..199D Cat. J/AJ/159/199
Ray et al. Paper V : 2022AJ....163..195R 2022AJ....163..195R Cat. J/AJ/163/195
Myers et al. Paper VI : 2022AJ....164...85M 2022AJ....164...85M
(End) Prepared by [AAS], Coralie Fix [CDS], 16-Sep-2022