Photometric versus empirical surface gravities of eclipsing binaries.

Details Photometric versus empirical surface gravities of eclipsing binaries. Photometric versus empirical surface gravities of eclipsing binaries.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326.1044j&link_type=abstract

Astronomy and Astrophysics, v.326, p.1044-1054

Astronomy and Astrophysics

Astrophysics

17

Stars: Fundamental Parameters, Stars: Binaries: Eclipsing, Stars: Early-Type, Stars: Late-Type

Scientific paper

Systematic differences in photometric stellar surface gravity determination are studied by means of the comparison with empirical values derived from detached double-lined eclipsing binaries. Photometric gravities were computed using Moon & Dworetsky (1985MNRAS.217..305M) grids based on Kurucz (1979ApJS...40....1K) atmosphere models, and empirical gravities were taken from Andersen (1991A&ARv...3...91A). Individual Stroemgren colours and β indices of each component of the binary system have to be taken into account to correctly analyze the observed differences. A compilation of data on a sample containing 30 detached double-lined eclipsing binaries with accurate (=~1-2%) determination of mass and radius and available uvbyHbeta_ photometric data is also presented. Correction of the differences in terms of T_eff_ and logg for the range 11000K

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