A Revised Effective Temperature Scale for the Kepler Input Catalog
Abstract
We present a catalog of revised effective temperatures for stars observed in longcadence 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 colortemperature 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 V_{T}JK_{s} in both open clusters and the Kepler fields. We find good agreement overall, with some deviations between (J  K_{s} )based temperatures from the IRFM and both SDSS filter and other diagnostic IRFM colortemperature relationships above 6000 K. For field dwarfs, we find a mean shift toward hotter temperatures relative to the KIC, of order 215 K, in the regime where the IRFM scale is well defined (4000 K to 6500 K). This change is of comparable magnitude in both color systems and in spectroscopy for stars with T _{eff} below 6000 K. 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 colorbased temperatures from binaries are significant. Typical errors, mostly from uncertainties in extinction, are of order 100 K. Implications for other applications of the KIC are discussed.
 Publication:

The Astrophysical Journal Supplement Series
 Pub Date:
 April 2012
 DOI:
 10.1088/00670049/199/2/30
 arXiv:
 arXiv:1110.4456
 Bibcode:
 2012ApJS..199...30P
 Keywords:

 stars: fundamental parameters;
 Astrophysics  Solar and Stellar Astrophysics
 EPrint:
 Corrected for sign flip errors in the gravity corrections. Erratum to this paper is attached in Appendix. Full version of revised Table 7 can be found at http://home.ewha.ac.kr/~deokkeun/kic/sdssteff_v2.dat.gz