Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..240s&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Feb. 15, 1979, p. 240-256.
Astronomy and Astrophysics
Astrophysics
175
Helium, Hydrogen, Radii, Stellar Mass, White Dwarf Stars, Astronomical Photometry, Atmospheric Models, Dimensional Measurement, Error Analysis, H Lines, Parallax, Stellar Evolution, Stellar Spectra, Stellar Temperature
Scientific paper
The basic method for calculating stellar radii is briefly described. It is claimed that systematic errors in the method are approximately 5% for the hydrogen-rich stars, taking into account a discussion of systematic errors in support of that statement. Procedures strictly relevant to the calculations for the H-rich stars are given and procedures for the He-rich stars are discussed. Selection effects are also examined. It is found that the mean radius of a sample of 110 hydrogen-rich stars with parallaxes and good photometry is 0.0127 solar radius. The mean radius of a sample of 28 He-rich stars is 0.0111 solar radius, which, considering the uncertainties, is not significantly different from that of the DA stars.
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