The mass of the white dwarf in GW Libra
L. van Spaandonk, D. Steeghs, T.R. Marsh, S.G. Parsons
TL;DR
This study measures the mass and rotation of the white dwarf in GW Libra using high-resolution spectroscopy, providing precise values that enhance understanding of white dwarf properties in dwarf novae.
Contribution
The paper presents the first direct measurement of the white dwarf's mass and rotational velocity in GW Libra through high-resolution spectral analysis.
Findings
White dwarf mass is 0.84 ± 0.02 M_sun.
Rotational velocity (vsini) is 87.0 ± 3.4 km/s.
Spin period is approximately 97 seconds.
Abstract
We report a mass and rotational broadening (vsini) for the pulsating white dwarf component of the WZ Sge type Dwarf Nova GW Lib based on high-resolution VLT spectroscopy that resolves the MgII 4481A absorption feature. Its gravitational redshift combined with white dwarf mass-radius models, provides us with a direct measurement of the white dwarf mass of M_1 = 0.84 pm 0.02 M_sun. The line is clearly resolved and if associated with rotational broadening gives vsini=87.0 pm 3.4 km/s, equivalent to a spin period of 97 pm 12s.
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