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Atmospheric parameters of the white-dwarf companion to HD 74389
Publications of the Astronomical Society of the Pacific
We present an optical slit spectrum of the recently discovered DA white-dwarf companion to the A2 V star HD 74389. Fits of theoretical spectra to six observed Balmer lines lead to estimates of T e ~ 41,000*^ K and log g ~ 7.85ío;¡^. 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 -1-9.4, a value not inconsistent with the assumption that the two stars lie at a similar distance from the Sun.doi:10.1086/132741 fatcat:qnl2q4xgcbgalmwkopq2qcacr4