A Far-Ultraviolet Spectroscopic Analysis of BZ Ursae Majoris

作者：Godon Patrick^*; Sion Edward M; Gaensicke Boris T; de Martino Domitilla

来源：Publications of the Astronomical Society of the Pacific, 2011, 123(907): 1071-1075.

DOI：10.1086/661763

We present an analysis of the Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) far-ultraviolet snapshot spectrum of the dwarf nova BZ UMa taken during quiescence. We find that the flux continuum is consistent with that of a white dwarf atmosphere with a temperature of 15,000 K, a projected rotational velocity of 200 km/s, nonsolar abundances with enhanced N/C ratio, and a distance of approximate to 156 pc when assuming a white dwarf gravity of log g 7.5. We also show that the hydrogen quasi-molecular satellite lines opacity affects the spectrum around. lambda approximate to 1300-1400 angstrom and has to be included to fine-tune the spectral modeling, this is self-consistent with the low stellar temperature we find.

• 出版日期2011-9