Atmospheric parameters of the white-dwarf companion to HD 74389

Details Atmospheric parameters of the white-dwarf companion to HD 74389 Atmospheric parameters of the white-dwarf companion to HD 74389

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1126l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Oct. 1990, p. 1126-1130.

Physics

7

A Stars, Binary Stars, Stellar Atmospheres, Stellar Physics, White Dwarf Stars, Balmer Series, Charge Coupled Devices, Companion Stars, Stellar Spectra, Stellar Temperature

Scientific paper

An optical slit spectrum of the recently discovered DA white-dwarf companion to the A2 V star HD 74389 is presented. Fits of theoretical spectra to six observed Balmer lines lead to estimates of Tc = 41,000 (+4000, -1000) K and log g = 7.85 (+0.20, -0.06). The latter implies that the white dwarf does not have a substantially higher mass than the mean for field DA white dwarfs. These parameters lead to an estimated M(v) = +9.4, a value not inconsistent with the assumption that the two stars lie at a similar distance from the sun.

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