J/ApJS/199/30 Effective temperature scale for KIC stars (Pinsonneault+, 2012)
A revised effective temperature scale for the Kepler Input Catalog.
Pinsonneault M.H., An D., Molenda-Zakowicz J., Chaplin W.J., Metcalfe T.S.,
Bruntt H.
<Astrophys. J. Suppl. Ser., 199, 30 (2012)>
=2012ApJS..199...30P 2012ApJS..199...30P
ADC_Keywords: Effective temperatures ; Abundances, [Fe/H] ;
Stars, double and multiple
Keywords: stars: fundamental parameters
Abstract:
We present a catalog of revised effective temperatures for stars
observed in long-cadence mode in the Kepler Input Catalog (KIC). We
use Sloan Digital Sky Survey (SDSS) griz filters tied to the
fundamental temperature scale. Polynomials for griz color-temperature
relations are presented, along with correction terms for surface
gravity effects, metallicity, and statistical corrections for binary
companions or blending. We compare our temperature scale to the
published infrared flux method (IRFM) scale for VTJKs in both open
clusters and the Kepler fields. We find good agreement overall, with
some deviations between (J-Ks)-based temperatures from the IRFM
and both SDSS filter and other diagnostic IRFM color-temperature
relationships above 6000K. For field dwarfs, we find a mean shift
toward hotter temperatures relative to the KIC, of order 215K, in the
regime where the IRFM scale is well defined (4000K to 6500K). This
change is of comparable magnitude in both color systems and in
spectroscopy for stars with Teff below 6000K. Systematic differences
between temperature estimators appear for hotter stars, and we define
corrections to put the SDSS temperatures on the IRFM scale for them.
When the theoretical dependence on gravity is accounted for, we find a
similar temperature scale offset between the fundamental and KIC
scales for giants. We demonstrate that statistical corrections to
color-based temperatures from binaries are significant. Typical
errors, mostly from uncertainties in extinction, are of order 100K.
Description:
We took griz photometry from long-cadence targets in the Kepler Input
Catalog (KIC) (Brown et al. 2011AJ....142..112B 2011AJ....142..112B, see Cat. V/133);
photometric uncertainties were taken as 0.01mag in gri and 0.03mag in
z. Errors were taken from the quadrature sum of uncertainties in the
individual filters. JHKs photometry was taken from the All Sky Data
Release of the 2MASS Point Source Catalog (Skrutskie et al. 2006, Cat.
VII/233) and checked against complementary information in the KIC
itself.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 63 161977 Catalog with revised Teff
table9.dat 63 7912 Tycho-2MASS-based IR-flux method (IRFM) Teff
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See also:
II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011)
J/MNRAS/412/1210 : Kepler asteroseismic targets (Molenda-Zakowicz+, 2011)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/ApJ/700/523 : Galactic star clusters in SDSS. II. Colors. (An+, 2009)
J/ApJ/546/1006 : VRI photometry of M35 (Barrado y Navascues+, 2001)
J/A+AS/130/65 : A standard stellar library. II. (Lejeune+ 1998)
J/A+AS/125/229 : A standard stellar library (Lejeune+ 1997)
J/AJ/106/181 : CCD photometry of open cluster M67 (Montgomery+ 1993)
http://www.ipac.caltech.edu/2mass/ : 2MASS home page at IPAC
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC Unique KIC catalog identification
10- 14 I5 K Te(S) ?=-9999 SDSS derived effective temperature (1)
16- 19 I4 K e_Te(S) ?=0 Total uncertainty in Te(S)
21- 24 I4 K E_Te(S) ?=0 Random uncertainty in Te(S)
26- 30 I5 K Te(I) ?=-9999 IRFM derived effective temperature (2)
32- 34 I3 K e_Te(I) ?=0 Total uncertainty in Te(I)
36- 38 I3 K E_Te(I) ?=0 Random uncertainty in Te(I)
40- 44 I5 K Te(K) KIC derived effective temperature
46- 50 F5.2 [cm/s2] log(g) KIC derived log gravity
52- 56 F5.2 [-] [Fe/H] KIC derived [Fe/H]
58- 61 I4 K Te.c [0/1020] Effective temperature correction (3)
63 I1 --- Q [0/1] Quality flag, 0=good (4)
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Note (1): Computed at a fixed [Fe/H]=-0.2.
Note (2): IRFM (infrared flux method) estimation based on (J-Ks) using
the original formula in C10 at [Fe/H]=-0.2.
Note (3): Correction factor for giants that has been subtracted from
Te(S) estimate.
Note (4): If the flag is set (=1), Te(S) estimates should be taken
with care (see Section 4.2.4).
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- KIC Unique KIC catalog identification
10- 14 I5 K Te(V-J) ?=-9999 Effective temperature from (VT-J) (1)
16- 18 I3 K e_Te(V-J) ?=0 Total uncertainty in Te(V-J)
20- 22 I3 K E_Te(V-J) ?=0 Random uncertainty in Te(V-J)
24- 28 I5 K Te(V-H) ?=-9999 Effective temperature from (VT-H) (1)
30- 32 I3 K e_Te(V-H) ?=0 Total uncertainty in Te(V-H)
34- 36 I3 K E_Te(V-H) ?=0 Random uncertainty in Te(V-H)
38- 42 I5 K Te(V-K) ?=-9999 Effective temperature from
(VT-KS) (1)
44- 46 I3 K e_Te(V-K) ?=0 Total uncertainty in Te(V-K)
48- 50 I3 K E_Te(V-K) ?=0 Random uncertainty in Te(V-K)
52- 55 I4 K Te(J-K) Effective temperature from (J-KS) (1)
57- 59 I3 K e_Te(J-K) Total uncertainty in Te(J-K)
61- 63 I3 K E_Te(J-K) Random uncertainty in Te(J-K)
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Note (1): Computed at a fixed [Fe/H]=-0.2.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Jun-2012