2011A&A...528A.121B


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET21:29:01

2011A&A...528A.121B - Astronomy and Astrophysics, volume 528A, 121-121 (2011/4-1)

Atmospheric parameters of red giants in the Kepler field.

BRUNTT H., FRANDSEN S. and THYGESEN A.O.

Abstract (from CDS):

Accurate fundamental parameters of stars are mandatory for the asteroseismic investigation of the Kepler mission to succeed. We determine the atmospheric parameters for a sample of six well-studied bright K giants to confirm that our method produces reliable results. We then apply the same method to 14 K giants that are targets of the Kepler mission. We used high-resolution, high signal-to-noise ratio spectra acquired using the FIES spectrograph on the Nordic Optical Telescope. We applied the iterative spectral synthesis method VWA to derive the fundamental parameters from carefully selected high-quality iron lines and pressure-sensitive Calcium lines. We find good agreement with parameters from the literature for the six bright giants. We compared the spectroscopic values with parameters based on photometric indices in the Kepler Input Catalogue (KIC). We identify serious problems with the KIC values for [Fe/H] and find a large RMS scatter of 0.5dex. The logg values in KIC agree reasonably well with the spectroscopic values displaying a scatter of 0.25dex after excluding two low-metallicity giants. The Teff values from VWA and KIC agree well with a scatter of about 85K. We also find good agreement with logg and Teff derived from asteroseismic analyses for seven Kepler giant targets. We determine accurate fundamental parameters of 14 giants using spectroscopic data. The large discrepancies between photometric and spectroscopic values of [Fe/H] emphasize the need for further detailed spectroscopic follow-up of the Kepler targets. This will be mandatory to be able to produce reliable constraints for detailed asteroseismic analyses and interpretation of possible exo-planet candidates found around giant stars.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: abundances - stars: fundamental parameters - stars: Population II

VizieR on-line data: <Available at CDS (J/A+A/528/A121): stars.dat kepgiant.dat>

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * alf Mon PM* 07 41 14.8325688 -09 33 04.071083 5.83 4.95 3.93 3.16 2.64 G9.5III-IIIbFe-0.5 186 0
2 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2061 0
3 * mu. Leo PM* 09 52 45.8165435 +26 00 25.031882 6.50 5.10 3.88 2.97 2.39 K2IIIbCN1Ca1 407 0
4 * psi UMa PM* 11 09 39.8086764 +44 29 54.552050 5.27 4.15 3.01 2.18 1.61 K1III 262 0
5 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2151 0
6 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1688 0
7 KIC 7006979 RG* 18 43 38.9520044058 +42 35 29.434882322   11.00 9.96 9.70   ~ 15 0
8 2MASS J18501537+4431571 RG* 18 50 15.3752997997 +44 31 57.119306944   11.72 10.89     ~ 10 0
9 KIC 3936921 RG* 19 02 39.3557626268 +39 05 59.225555970   12.33 10.88     ~ 18 0
10 KIC 8017159 RG* 19 08 41.6306903216 +43 52 10.320892797   11.91 11.14     ~ 16 0
11 KIC 11342694 RG* 19 11 00.6318217547 +49 06 52.754809240   11.40 10.14     K3III 17 0
12 BD+38 3559 RG* 19 22 27.4543322675 +38 50 52.907500781   10.79 9.81     K2 28 0
13 KIC 10403036 RG* 19 24 33.6374977276 +47 32 10.735480706   12.47 11.24 10.83   ~ 13 0
14 KIC 4157282 RG* 19 26 11.0376763408 +39 13 42.432164384   12.71 10.97 10.485   ~ 14 0
15 KIC 1726211 RG* 19 30 01.0670625524 +37 17 33.906935463   12.14 11.16     G8II 21 0
16 KIC 5709564 RG* 19 32 18.5550635600 +40 58 21.848820495   11.03 9.90     G8III 16 0
17 TYC 3135-696-1 RG* 19 35 58.7268599631 +38 57 32.836568153   12.49 11.49 11.06   K3III 12 0
18 2MASS J19434309+3917436 RG* 19 43 43.0965148157 +39 17 43.570305206   12.02 10.66     K3III 13 0
19 BD+47 2960 RG* 19 56 41.7021584641 +47 33 29.733952938   11.24 10.31     G5V: 22 0
20 * nu. Ind ** 22 24 36.8855638745 -72 15 19.494501994   5.94 5.29     G9VFe-3.1CH-1.5 247 0
21 * lam Peg PM* 22 46 31.8778614 +23 33 56.356140 5.93 5.00 3.93 3.16 2.66 G8IIIaCN0.5 158 0
22 * mu. Peg PM* 22 50 00.1931506 +24 36 05.698380 5.10 4.42 3.48 2.80 2.33 G8+III 278 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-21:29:01

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