Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.168..153k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 168, no. 1, June 1990, p. 153-172. Research supported by the Korea Researc
Astronomy and Astrophysics
Astrophysics
4
Brightness, Cepheid Variables, Dwarf Stars, Stellar Luminosity, Size (Dimensions), Stellar Color, Stellar Spectrophotometry
Scientific paper
In order to determine the radii of dwarf Cepheids by applying the visual surface brightness method, the empirical relationship between F(v) and (b - y) was derived. Seventeen stars of spectral type A to F, where both angular diameters and uvby beta photometric data are available, were selected from the literature. A theoretical F(v), (b-y) relation was derived by using the Kurucz model atmospheres. It was found that the theoretical relation is strongly dependent upon metallicity and surface gravity. To demonstrate that the visual surface brightness method is an effective way to determine the radii of dwarf Cepheids, both theoretical and empirical relations were applied to seven dwarf Cepheids. The most reliable result was obtained for AD CMi where the quality of the radial velocity data is superior.
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