The mass of the white dwarf in GW libra

Lieke van Spaandonk, D. Steeghs, Thomas R. Marsh, S. G. Parsons

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Abstract

We report a mass and rotational broadening (vsin i) for the pulsating white dwarf (WD) component of the WZSge type Dwarf Nova GW Lib based on high-resolution Very Large Telescope spectroscopy that resolves the Mg II 4481 Å absorption feature. Its gravitational redshift combined with WD mass-radius models provides us with a direct measurement of the WD mass of M 1 = 0.84 ± 0.02 M 1. The line is clearly resolved and if associated with rotational broadening gives vsin i = 87.0 ± 3.4 km s-1, equivalent to a spin period of 97 ± 12 s.

Original languageEnglish
JournalThe Astrophysical Journal Letters
Volume715
Issue number2 PART 2
DOIs
Publication statusPublished - 2010
Externally publishedYes

Keywords

  • Binaries: spectroscopic
  • Cataclysmic variables
  • Novae
  • Stars: individual (GW Lib)

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