J/A+A/616/A33 Stellar parameters of 372 giant stars (Stock+, 2018)
Precise radial velocities of giant stars.
X. Bayesian stellar parameters and evolutionary stages for 372 giant stars
from the Lick planet search.
Stock S., Reffert S., Quirrenbach A.
<Astron. Astrophys. 616, A33 (2018)>
=2018A&A...616A..33S 2018A&A...616A..33S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, masses ; Stars, ages ; Stars, giant ; Stars, K-type
Keywords: stars: fundamental parameters - stars: late-type - stars: evolution -
Hertzsprung-Russell and C-M diagrams - planetary systems -
methods: statistical
Abstract:
The determination of accurate stellar parameters of giant stars is
essential for our understanding of such stars in general and as
exoplanet host stars in particular. Precise stellar masses are vital
for determining the lower mass limit of potential substellar
companions with the radial velocity method.
Our goal is to determine stellar parameters, including mass, radius,
age, surface gravity, effective temperature and luminosity, for the
sample of giants observed by the Lick planet search. Furthermore, we
want to derive the probability of these stars being on the horizontal
branch (HB) or red giant branch (RGB), respectively.
We compare spectroscopic, photometric and astrometric observables to
grids of stellar evolutionary models using Bayesian inference. We
provide tables of stellar parameters, probabilities for the current
post-main sequence evolutionary stage, and probability density
functions for 372 giants from the Lick planet search.
We find that 81% of the stars in our sample are more probably on the
HB. In particular, this is the case for 15 of the 16 planet host stars
in the sample. We tested the reliability of our methodology by
comparing our stellar parameters to literature values and find very
good agreement. Furthermore, we created a small test sample of 26
giants with available asteroseismic masses and evolutionary stages and
compared these to our estimates. The mean difference of the stellar
masses for the 24 stars with the same evolutionary stages by both
methods is only ΔM=0.01±0.20M☉. We do not find any
evidence for large systematic differences between our results and
estimates of stellar parameters based on other methods. In particular
we find no significant systematic offset between stellar masses
provided by asteroseismology to our Bayesian estimates based on
evolutionary models.
Description:
For the 372 giant stars we studied, we provide in our table the
determined stellar parameters which includes mass (M), radius (R), age
(A), surface gravity (G), effective temperature (T) and luminosity
(L). For each stellar parameter we provide the value that was
determined from the maximum (mode) of the probability density function
(PDF) as well as the mean value of the PDF for this stellar parameter.
We also provide the 1-sigma and 3-sigma confidence interval for each
stellar parameter. Additionally, each giant can have two solutions of
stellar parameters depending on the assigned post-main sequence
evolutionary stage which can be red-giant branch (RGB) or horizontal
branch (HB). We provide a probability (P) for each case. Stars with
less 1% probability for a specific evolutionary stage have no
determined stellar parameters for this specific solution. The
tabulated stellar masses and surface gravities are corrected with the
Reimer's mass loss along the RGB. Input parameters for the
determination of the tabulated solutions were parallaxes by van
Leeuwen (2007, Cat. I/311), metallicities by Hekker & Melendez
(2007A&A...475.1003H 2007A&A...475.1003H) and BV photometry included in the Hipparcos
catalog (ESA, 1997. Cat. I/239). We compared these observables to
grids of stellar evolutionary models by Bressan et al.
(2012MNRAS.427..127B 2012MNRAS.427..127B) using Bayesian inference.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
giants.dat 290 744 List of derived stellar parameters for 372
giant stars
images/* . 593 PDFs of HB and RGB solutions as fits files
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See also:
J/A+A/475/1003 : Stellar parameters of G and K giant stars (Hekker+, 2007)
J/A+A/574/A116 : G and K giant stars stellar parameters (Reffert+, 2015)
J/A+A/595/A55 : Radial velocity data of HD 59686 A (Ortiz+, 2016)
Byte-by-byte Description of file: giants.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos identifier of the star
8- 10 A3 --- Stage Evolutionary Stage (1)
12- 15 F4.2 --- P Probability of the evolutionary stage
17- 20 F4.2 Msun Mmode ? Stellar mass determined from mode
22- 25 F4.2 Msun Mmean ? Stellar mass determined from mean
27- 30 F4.2 Msun e_M ? Lower boundary of 1-sigma range for the
stellar mass
32- 35 F4.2 Msun E_M ? Upper boundary of 1-sigma range for the
stellar mass
37- 40 F4.2 Msun e3_M ? Lower boundary of 3-sigma range for the
stellar mass
42- 46 F5.2 Msun E3_M ? Upper boundary of 3-sigma range for the
stellar mass
48- 53 F6.2 Rsun Rmode ? Stellar radius determined from mode
55- 60 F6.2 Rsun Rmean ? Stellar radius determined from mean
62- 67 F6.2 Rsun e_R ? Lower boundary of 1-sigma range for the
stellar radius
69- 74 F6.2 Rsun E_R ? Upper boundary of 1-sigma range for the
stellar radius
76- 81 F6.2 Rsun e3_R ? Lower boundary of 3-sigma range for the
stellar radius
83- 88 F6.2 Rsun E3_R ? Upper boundary of 3-sigma range for the
stellar radius
90- 93 F4.2 [cm/2] logGmode ? Logarithm of stellar surface gravity
determined from mode
95- 98 F4.2 [cm/2] logGmean ? Logarithm of stellar surface gravity
determined from mean
100-103 F4.2 [cm/2] e_logG ? Lower boundary of 1-sigma range for the
logarithm of the stellar surface gravity
105-108 F4.2 [cm/2] E_logG ? Upper boundary of 1-sigma range for the
logarithm of the stellar surface gravity
110-114 F5.2 [cm/2] e3_logG ? Lower boundary of 3-sigma range for the
logarithm of the stellar surface gravity
116-119 F4.2 [cm/2] E3_logG ? Upper boundary of 3-sigma range for the
logarithm of the stellar surface gravity
121-125 F5.2 [yr] logAmode ? Logarithm of stellar age determined
from mode
127-131 F5.2 [yr] logAmean ? Logarithm of stellar age determined
from mean
133-137 F5.2 [yr] e_logA ? Lower boundary of 1-sigma range for the
logarithm of the stellar age
139-143 F5.2 [yr] E_logA ? Upper boundary of 1-sigma range for the
logarithm of the stellar age
145-148 F4.2 [yr] e3_logA ? Lower boundary of 3-sigma range for the
logarithm of the stellar age
150-154 F5.2 [yr] E3_logA ? Upper boundary of 3-sigma range for the
logarithm of the stellar age
156-161 F6.1 K Tmode ? Stellar effective temperature determined
from mode
163-168 F6.1 K Tmean ? Stellar effective temperature determined
from mean
170-175 F6.1 K e_T ? Lower boundary of 1-sigma range for the
stellar effective temperature
177-182 F6.1 K E_T ? Upper boundary of 1-sigma range for the
stellar effective temperature
184-189 F6.1 K e3_T ? Lower boundary of 3-sigma range for the
stellar effective temperature
191-196 F6.1 K E3_T ? Upper boundary of 3-sigma range for the
stellar effective temperature
198-205 F8.2 Lsun Lmode ? Stellar luminosity determined from mode
207-214 F8.2 Lsun Lmean ? Stellar luminosity determined from mean
216-223 F8.2 Lsun e_L ? Lower boundary of 1-sigma range for the
stellar luminosity
225-232 F8.2 Lsun E_L ? Upper boundary of 1-sigma range for the
stellar luminosity
234-240 F7.2 Lsun e3_L ? Lower boundary of 3-sigma range for the
stellar luminosity
242-249 F8.2 Lsun E3_L ? Upper boundary of 3-sigma range for the
stellar luminosity
251-271 A21 --- Flag Flag for catalog (2)
273-290 A18 --- PDF PDFs of HB or RGB solution fits filename
in subdirectory images
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Note (1): Evolutionary Stage as follows:
RGB = red-giant branch
HB = horizontal branch
Note (2): FlagR as follows:
V = V-I color index used to determine stellar parameters
(instead of B-V)
D = Degeneracy for late-type K giants resolved by applying a cut to
the stellar evolutionary models based on the spectroscopic
effective temperature
L = RGB mass loss below threshold (<0.001M☉)
P = Probability of evolutionary stage less than 1%,
no stellar parameters provided
MM = Multi-modal PDF of the stellar mass
RM = Multi-modal PDF of the stellar radius
AM = Multi-modal PDF of the stellar age
TM = Multi-modal PDF of the stellar effective temperature
GM = Multi-modal PDF of the stellar surface gravity
LM = Multi-modal PDF of the stellar luminosity
MC = Mean of mass PDF is outside the 1-sigma confidence interval
RC = Mean of radius PDF is outside the 1-sigma confidence interval
AC = Mean of age PDF is outside the 1-sigma confidence interval
TC = Mean of effective temperature PDF is outside the 1-sigma
confidence interval
GC = Mean of surface gravity PDF is outside the 1-sigma
confidence interval
LC = Mean of luminosity PDF is outside the 1-sigma confidence interval
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Acknowledgements:
Stephan Stock, sstock(at)lsw.uni-heidelberg.de
References:
Hekker et al., Paper I 2006A&A...454..943H 2006A&A...454..943H
Reffert et al., Paper II 2006ApJ...652..661R 2006ApJ...652..661R
Hekker & Melendez, Paper III 2007A&A...475.1003H 2007A&A...475.1003H, Cat. J/A+A/475/1003
Hekker et al., Paper IV 2008A&A...480..215H 2008A&A...480..215H
Mitchell et al., Paper V 2013A&A...555A..87M 2013A&A...555A..87M
Trifonov et al., Paper VI 2014A&A...568A..64T 2014A&A...568A..64T
Reffert et al., Paper VII 2015A&A...574A.116R 2015A&A...574A.116R, Cat. J/A+A/574/A116
Trifonov et al., Paper VIII 2015A&A...582A..54T 2015A&A...582A..54T
Ortiz et al., Paper IX 2016A&A...595A..55O 2016A&A...595A..55O, Cat. J/A+A/595/A55
(End) Patricia Vannier CDS 23-May-2018