The hot hybrid white dwarf G200-39

Details The hot hybrid white dwarf G200-39 The hot hybrid white dwarf G200-39

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1612l&link_type=abstract

Astronomical Journal, vol. 84, Oct. 1979, p. 1612-1618.

Astronomy and Astrophysics

Astronomy

21

Hot Stars, Line Spectra, Stellar Spectra, White Dwarf Stars, Helium, Hydrogen, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Rotation

Scientific paper

Results are reported for six separate spectroscopic observations of the nonmagnetic hot white dwarf G200-39. The observations are found not to suggest any substantial variability in the spectrum of G200-39. The observed spectrum is shown to originate from a single white dwarf, and the results are compared with model atmospheres. An effective temperature of about 15,000 K is estimated, along with log g = 8 and a He/H number-density ratio of approximately 4000. It is argued that G200-39 is not composite, that this star lacks a magnetic field stronger than 500,000 G, and that the atmosphere is probably not stratified with a pure hydrogen upper layer. Spectroscopic discriminants for DBA stars are considered, and characteristics of known white dwarfs with intermediate He/H number-density ratios are discussed.

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