Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...484l.149c&link_type=abstract
Astrophysical Journal Letters v.484, p.L149
Astronomy and Astrophysics
Astronomy
50
Stars: Novae, Cataclysmic Variables, Stars: Individual Constellation Name: Wz Sagittae, Stars: White Dwarfs
Scientific paper
We present Hubble Space Telescope Goddard High-Resolution Spectrograph G140L spectra of the white dwarf in WZ Sge, exposed during quiescence. Our best-fitting synthetic spectra yield a rapidly rotating white dwarf with velocity Vrot sin i = 1200 ^{+300}_{-400} km s-1, white dwarf effective temperature Twd = 14,800 K, the gravity log g = 8.0, and the chemical abundances relative to solar in number (with 3 sigma error bars) of C, 5.0 ^{+2.0}_{-2.0} ; N, 3.0 ^{+1.0}_{-1.0} ; and Si, <0.1. We also reexamined a previous Hubble Space Telescope Faint Object Spectrograph G130H spectrum reported by Sion and coworkers and obtained consistent values, but lower C and N abundances. We do not detect a measurable systematic shift in our observed spectra, presumably due to the extremely low mass of the companion.
Cheng Fu-Hua
Huang Min
Sion Edward M.
Szkody Paula
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