Spectroscopy of the eclipsing cataclysmic variable NSV 12615

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cataclysmic Variables, Eclipsing Binary Stars, H Alpha Line, Stellar Magnitude, White Dwarf Stars, Emission Spectra, Line Spectra, Radial Velocity, Stellar Mass, Stellar Spectra

Scientific paper

The authors report on their spectroscopy of the short-period, 18th magnitude eclipsing binary NSV 12615. It shows a strong, broad and double-peaked Hα emission line, the width of which (3200±500 km s-1FWZI) confirms that NSV 12615 is a cataclysmic variable and suggests it to be an SU UMa type system. The authors also detect its orbital motion. The semi-amplitude of the radial velocity variations (56±7 km s-1) suggests a higher (0.62 - 1.40 M_sun;) white dwarf mass than that estimated from the FWZI (0.2 - 0.4 M_sun;). The authors discuss the possible explanations for this result.

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