MV Lyrae at minimum light

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Spectroscopy, Continuous Spectra, Dwarf Novae, Lyra Constellation, Stellar Spectra, Accretion Disks, Balmer Series, Binary Stars, Stellar Magnetic Fields, Stellar Models, White Dwarf Stars

Scientific paper

The results of spectroscopic observations of the nova-like object MV Lyr at minimum light (mv ⪆ 18m) are presented. From radial velocity measurements of the hydrogen lines the author determined a system period P = 0d.1324. It is shown that the high excitation spectra are formed in a small volume and that they are likely produced by infall of matter onto the white dwarf's surface near a magnetic pole. The spectral class of the secondary is estimated to be M5 V. The masses of the components are estimated as: M1 = 0.88 M_sun; and M2 = 0.43 M_sun;; the system inclination is i = 24°; the distance between the components is 0.8×1011cm. The spectral characteristics of the system at maximum and minimum are compared. The observed phenomena are interpreted in terms of non-stationary outflow from the secondary.

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