J/A+A/574/A116 G and K giant stars stellar parameters (Reffert+, 2015)
Precise radial velocities of giant stars.
VII. Occurrence rate of giant extrasolar planets as a function of mass and
metallicity.
Reffert S., Bergmann C., Quirrenbach A., Trifonov T., Kuenstler A.
<Astron. Astrophys. 574, A116 (2015)>
=2015A&A...574A.116R 2015A&A...574A.116R
ADC_Keywords: Stars, giant ; Stars, G-type ; Stars, K-type ; Stars, masses
Keywords: techniques: radial velocities - planets and satellites: detection -
brown dwarfs - planetary systems
Abstract:
We have obtained precise radial velocities for a sample of 373 G and K
type giants at Lick Observatory regularly over more than 12 years.
Planets have been identified around 15 of these giant stars, and an
additional 20 giant stars host planet candidates.
We are interested in the occurrence rate of substellar companions
around giant stars as a function of stellar mass and metallicity. We
probe the stellar mass range from approximately 1 to beyond 3M☉,
which is not being explored by main-sequence samples.
We fit the giant planet occurrence rate as a function of stellar mass
and metallicity with a Gaussian and an exponential distribution,
respectively.
Description:
The stellar parameters of 373 G and K giant stars were derived via a
comparison of the position in the color-magnitude diagram with
evolutionary tracks from Girardi et al. (2000A&AS..141..371G 2000A&AS..141..371G, Cat.
J/A+AS/141/317). A trilinear interpolation in the tracks was performed
to obtain stellar parameters for the observed position in the
color-magnitude diagram. Errors on stellar parameters were derived
from Monte Carlo simulations, taking the measurement errors in the
input data into account.
B-V magnitude and absolute V magnitude M_V are based on Hipparcos data
(version of van Leeuwen 2007, ASSL 350, Springer, Cat. I/311).
The spectroscopic metallicity from Hekker & Melendez
(2007A&A...475.1003H 2007A&A...475.1003H, Cat. J/A+A/475/1003) was taken into account in
the derivation of stellar parameters. In many cases the comparison
with evolutionary tracks yielded two results: one solution for the red
giant branch (RGB) and one solution for the horizontal branch (HB).
Both solutions are given, if applicable. In addition, a probability is
given for the star to be either on the RGB or on the HB, which was
derived taken the initial mass function as well as the evolutionary
time scales at certain evolutionary stages into account.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 131 583 Stellar parameters for 373 giant stars
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See also:
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
J/A+AS/141/371 : Low-mass stars evolutionary tracks+isochrones (Girardi+, 2000)
J/A+A/475/1003 : Stellar parameters of G and K giant stars (Hekker+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos number
8 A1 --- f_HIP [*] flag set if no result from interpolation
10- 13 F4.2 Msun Mass [0.9/7.9] Stellar mass
17- 20 F4.2 Msun e_Mass Error in stellar mass
23- 27 F5.2 [Sun] [Fe/H] [-0.8/0.3] Stellar metallicity
31- 34 F4.2 [Sun] e_[Fe/H] [0.06/0.5] Error in stellar metallicity
37- 40 I4 K Teff ? Stellar effective temperature
43- 46 I4 K e_Teff ? Error in stellar effective temperature
50- 55 F6.1 Lsun L* ? Stellar luminosity
59- 64 F6.1 Lsun e_L* ? Error in stellar luminosity
69- 72 F4.2 [cm/s2] logg ? Surface gravity, cgs units (log scale)
76- 79 F4.2 [cm/s2] e_logg ? Error in surface gravity logg
83- 88 F6.2 Rsun R* ? Stellar radius
91- 95 F5.2 Rsun e_R* ? Error in stellar radius
98-101 F4.2 Msun Mloss ? Integrated stellar mass loss
104-107 F4.2 Msun e_Mloss ? Error in stellar mass loss
110-114 F5.2 Gyr Age ? Stellar Age t*
117-120 F4.2 Gyr e_Age ? Error in Stellar Age
123-126 F4.2 --- P(St) [0/1]? Probability for RGB/HB
129-131 A3 --- St [RGB/HB] Red giant branch/horizontal branch
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Acknowledgements:
Sabine Reffert, sreffert(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
(End) Sabine Reffert [Univ. Heidelberg], Patricia Vannier [CDS] 22-Dec-2014