Atmospheric parameters of the white-dwarf companion to HD 74389

James Liebert, P. Bergeron, Rex A. Saffer
1990 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