J/ApJ/888/43 APOGEE-Kepler Cool Dwarf star ages determination (Claytor+, 2020)
Chemical evolution in the Milky Way: rotation-based ages for APOGEE-Kepler
Cool Dwarf stars.
Claytor Z.R., van Saders J.L., Santos A.R.G., Garcia R.A., Mathur S.,
Tayar J., Pinsonneault M.H., Shetrone M.
<Astrophys. J., 888, 43 (2020)>
=2020ApJ...888...43C 2020ApJ...888...43C
ADC_Keywords: Stars, ages; Abundances; Stars, masses; Stars, diameters; Models
Keywords: Stellar rotation ; Stellar ages ; Stellar evolution ;
Galaxy chemical evolution
Abstract:
We use models of stellar angular momentum evolution to determine ages
for ∼500 stars in the APOGEE-Kepler Cool Dwarfs sample. We focus on
lower-main-sequence stars, where other age-dating tools become
ineffective. Our age distributions are compared to those derived from
asteroseismic and giant samples and solar analogs. We are able to
recover gyrochronological ages for old, lower-main-sequence stars, a
remarkable improvement over prior work in hotter stars. Under our
model assumptions, our ages have a median relative uncertainty of 14%,
comparable to the age precision inferred for more massive stars using
traditional methods. We investigate trends of Galactic
α-enhancement with age, finding evidence of a detection
threshold between the age of the oldest α-poor stars and that of
the bulk α-rich population. We argue that gyrochronology is an
effective tool reaching ages of 10-12Gyr in K and early M dwarfs.
Finally, we present the first effort to quantify the impact of
detailed abundance patterns on rotational evolution. We estimate a
∼15% bias in age for cool, α-enhanced (+0.4dex) stars when
standard solar-abundance-pattern rotational models are used for age
inference, rather than models that appropriately account for
α-enrichment.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 170 483 The input data and derived rotation-based ages
for stars in the APOGEE-Kepler cool dwarfs sample
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
J/A+AS/129/237 : G and K dwarfs abundances (Feltzing+ 1998)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/A+A/397/147 : Activity-rotation relationship in stars (Pizzolato+ 2003)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/ApJ/691/342 : griBVI photometry in M37 (Hartman+, 2009)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/ApJ/733/L9 : Stellar rotation for 71 NGC 6811 members (Meibom+, 2011)
J/ApJ/743/48 : Stars with rot. periods and X-ray luminosities (Wright+, 2011)
J/ApJ/753/90 : Parameters of K5 and later type Kepler stars (Mann+, 2012)
J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)
J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)
J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)
J/ApJ/780/159 : Rotation-mass-age relationship of old stars (Epstein+, 2014)
J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/ApJ/807/82 : Rotational velocities of APOKASC red giants (Tayar+, 2015)
J/ApJ/822/47 : K2 rotation periods for 65 Hyades members (Douglas+, 2016)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
J/MNRAS/456/3655 : Masses and ages of red giants (Martig+, 2016)
J/ApJ/821/93 : Rotation & Galactic kinematics of mid M dwarfs (Newton+, 2016)
J/AJ/152/113 : Pleiades members with K2 LCs. I. Periods (Rebull+, 2016)
J/A+A/605/A111 : Surface rotation of Kepler red giant stars (Ceillier+, 2017)
J/A+A/601/A67 : Kepler solar-type stars modeling (Creevey+, 2017)
J/ApJS/229/30 : Revised properties of Q1-17 Kepler targets (Mathur+, 2017)
J/ApJ/839/92 : Praesepe members with K2 light curve data (Rebull+, 2017)
J/ApJS/233/23 : APOKASC catalog of KIC dwarfs and subgiants (Serenelli+, 2017)
J/ApJ/862/33 : Expanded membership catalog for NGC752 (Agueros+, 2018)
J/ApJ/866/99 : Radii of KIC stars & planets using Gaia DR2 (Berger+, 2018)
J/MNRAS/475/5487 : Stellar properties of KIC stars (Silva Aguirre+, 2018)
J/A+A/624/A19 : GALAH survey, chemodynamical analyse with TGAS (Buder+, 2019)
J/ApJ/879/49 : Rot. periods for 171 Gaia members of NGC 6811 (Curtis+, 2019)
J/ApJS/244/21 : Surface rot. & activity of Kepler stars. I. (Santos+, 2019)
J/ApJS/241/12 : Asteroseismic Target List (ATL) for TESS (Schofield+, 2019)
J/ApJ/871/174 : Kepler rapid rotators and Ks-band excesses (Simonian+, 2019)
J/A+A/624/A78 : Masses and ages of 1059 HARPS-GTO stars (Delgado Mena+, 2019)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Kepler Input Catalog
10- 25 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000)
27- 30 I4 K Teff Effective temperature
32- 34 I3 K e_Teff Uncertainty in Teff
36- 41 F6.3 [-] [M/H] Bulk metallicity
43- 47 F5.3 [-] e_[M/H] Uncertainty in [M/H]
49- 54 F6.3 [-] [a/H] log α-enhancement
56- 60 F5.3 [-] e_[a/H] Uncertainty in [a/H]
62- 71 A10 --- Spec Reference for spectral properties (1)
73- 76 F4.2 [cm2/s] log(g) log surface gravity
78- 81 F4.2 [cm2/s] e_log(g) ? Uncertainty in log(g)
83- 92 A10 --- r_log(g) Reference for log(g) (1)
94- 98 F5.2 d Prot Rotational period (2)
100-104 F5.2 d e_Prot Uncertainty in Prot (2)
106-111 F6.3 Lsun Lum ? Luminosity (3)
113-117 F5.3 Lsun e_Lum ? Lower uncertainty in Lum (3)
119-124 F6.3 Lsun E_Lum ? Upper uncertainty in Lum (3)
126-130 F5.2 Gyr Age Age (3)
132-135 F4.2 Gyr e_Age Lower uncertainty in Age (3)
137-140 F4.2 Gyr E_Age Upper uncertainty in Age (3)
142-145 F4.2 Msun Mass Mass (3)
147-150 F4.2 Msun e_Mass Lower uncertainty in Mass (3)
152-155 F4.2 Msun E_Mass Upper uncertainty in Mass (3)
157-160 F4.2 Rsun Rad Radius (3)
162-165 F4.2 Rsun e_Rad Lower uncertainty in Rad (3)
167-170 F4.2 Rsun E_Rad Upper uncertainty in Rad (3)
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Note (1): We adopted temperatures, metallicities ([M/H]), and α-element
abundances ([α/M]; α includes O, Mg, Si, S, Ca, and Ti but is
dominated by Mg, O, and Si in the dwarfs) from APOGEE Data Release 14
(Holtzman+ 2018AJ....156..125H 2018AJ....156..125H ; see III/284) and the APOGEE Stellar
Parameters and Chemical Abundances Pipeline (ASPCAP).
ASPCAP_cal = ASPCAP performs a temperature-dependent calibration to the
abundance measurements under the assumption that stars in a
given open cluster should have homogeneous abundances.
ASPCAP_raw = no calibrated spectroscopic parameters available, usually due to
the proximity of the stars' temperatures or metallicities to
ASPCAP atmosphere grid edges. For these stars we used the
uncalibrated values.
See Section 2.2.
Note (2): Estimated from Kepler light curves.
Note (3): Inferred from Gaia parallaxes by Berger+, 2018, J/ApJ/866/99
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Jun-2021