J/ApJ/927/167 Asteroseismology of Kepler red giant branch stars (Li+, 2022)
Asteroseismology of 3642 Kepler red giants: correcting the scaling relations
based on detailed modeling.
Li T., Li Y., Bi S., Bedding T.R., Davies G., Du M.
<Astrophys. J., 927, 167 (2022)>
=2022ApJ...927..167L 2022ApJ...927..167L
ADC_Keywords: Asteroseismology; Abundances; Stars, ages; Stars, masses;
Stars, diameters; Stars, giant
Keywords: Stellar oscillations ; Asteroseismology ; Stellar properties
Abstract:
This paper presents a correction to the scaling relations for red
giant stars using model-based masses and radii. We measure radial-mode
frequencies from Kepler observations for 3642 solar-like oscillators
on the red giant branch and use them to characterize the stars with
grid-based modeling. We determine fundamental stellar parameters with
good precision: the typical uncertainty is 4.5% for mass, 16% for age,
0.006dex for surface gravity, and 1.7% for radius. We also achieve
good accuracy for estimated masses and radii, based on a comparison
with those determined for eclipsing binaries. We find a systematic
offset of ∼15% in mass and ∼7% in radius between the modeling
solutions and the scaling relations. Further investigation indicates
that these offsets are mainly caused by a systematic bias in the
Δν scaling relation: the original scaling relation
underestimates the Δν value by ∼4%, on average, and it is
important to correct for the surface term in the calibration. We find
no significant offset in the νmax scaling relation, although a
clear metallicity dependence is seen and we suggest including a
metallicity term in the formulae. Lastly, we calibrate new scaling
relations for red giant stars based on observed global seismic
parameters, spectroscopic effective temperatures and metallicities,
and modeling-inferred masses and radii.
Description:
We cross matched the Kepler red giant branch (RGB) sample
(Hon+ 2017, J/MNRAS/469/4578) with spectroscopically measured
atmospheric parameters (Teff and [M/H]) from two large-scale
spectroscopic surveys: APOGEE DR16 (see III/284) and
LAMOST DR5 (see V/164).
See Section 2 for further details.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 156 5311 Observed constraints and model-inferred stellar
parameters
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
J/A+A/543/A54 : Main-sequence and subgiant oscillations (Appourchaux+, 2012)
J/A+A/540/A143 : Oscillations of red giants from Kepler (Mosser+, 2012)
J/A+A/541/A41 : Basic tracks at Zinit=0.006 (Mowlavi+, 2012)
J/A+A/572/L5 : Evolution state of RGBs from seismology (Mosser+, 2014)
J/A+A/573/A89 : STAGGER-grid of 3D stellar models. III. (Magic+, 2015)
J/MNRAS/452/2127 : Fundamental param. of Kepler stars (Silva Aguirre+, 2015)
J/ApJ/832/121 : 4-yr RV survey of red giant in EBs (Gaulme+, 2016)
J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)
J/MNRAS/469/4578 : Deep learning classif. in asteroseismology (Hon+, 2017)
J/ApJ/844/102 : KIC star plx from asteroseismology vs Gaia (Huber+, 2017)
J/ApJ/835/172 : Kepler asteroseismic LEGACY sample. I. (Lund+, 2017)
J/ApJ/835/173 : Kepler ast. LEGACY sample. II. (Silva Aguirre+, 2017)
J/ApJS/236/42 : Asteroseismology of ∼16000 Kepler red giants (Yu+, 2018)
J/ApJ/887/203 : Core rot. period measurements of KIC stars (Tayar+, 2019)
J/ApJS/245/34 : Abundances for 6 million stars from LAMOST (Xiang+, 2019)
J/MNRAS/495/2363 : Asteroseismology of 36 Kepler subgiants. I. (Li+, 2020)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [0/5310] Internal index number
6- 13 I8 --- KIC [893214/12885196] Kepler Input Catalog number
15- 20 A6 --- Source Survey source identifier
("APOGEE"=2510 occurrences or
"LAMOST"=2801 occurrences)
22- 27 F6.3 uHz Dnu [1/19] Observed δν scaling relation
29- 33 F5.3 uHz e_Dnu [0.008/0.3] Uncertainty in Dnu
35- 40 F6.2 uHz numax [7/271] Observed νmax scaling relation
42- 46 F5.2 uHz e_numax [0.17/71] Uncertainty in numax
48- 51 I4 K Teff [3977/6026] Observed effective temperature
53- 55 I3 K e_Teff [6/820] Uncertainty in Teff
57- 61 F5.3 [cm/s2] logg [1.6/4.8] Observed log surface gravity
63- 67 F5.3 [cm/s2] e_logg [0.015/1.7] Uncertainty in log (g)
69- 74 F6.3 [-] [M/H] [-0.3/0.3] Observed metallicity
76- 80 F5.3 [-] e_[M/H] [0.005/0.8] Uncertainty in [M/H]
82- 86 F5.3 Msun Mass [0.8/2.1] Model-inferred stellar mass
88- 92 F5.3 Msun E_Mass [0/0.9] Upper uncertainty in Mass
94- 98 F5.3 Msun e_Mass [0/1.1] Lower uncertainty in Mass
100- 105 F6.3 Gyr Age [0.7/21.1] Model-inferred stellar age
107- 112 F6.3 Gyr E_Age [0/18.2] Upper uncertainty in Age
114- 119 F6.3 Gyr e_Age [0/15.5] Lower uncertainty in Age
121- 126 F6.3 Rsun Rad [3.6/26.5] Model-inferred stellar radius
128- 132 F5.3 Rsun E_Rad [0/2.6] Upper uncertainty in Rad
134- 138 F5.3 Rsun e_Rad [0/4.4] Lower uncertainty in Rad
140- 144 F5.3 [cm/s2] logg-e [1.7/3.4] Model-inferred log stellar surface
gravity
146- 150 F5.3 [cm/s2] E_logg-e [0/0.2] Upper uncertainty in log(g)e
152- 156 F5.3 [cm/s2] e_logg-e [0/0.1] Lower uncertainty in log(g)e
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Jan-2024