Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105...51r&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 683, p. 51-58.
Other
18
Cataclysmic Variables, M Stars, Stellar Spectrophotometry, White Dwarf Stars, Absorption Spectra, Light Curve, Line Spectra, Stellar Magnitude, Stellar Spectra
Scientific paper
Results of a program to monitor the peculiar variable star MV Lyrae, carried out at Asiago since 1968, are reported. The light curve shows that MV Lyr passes at times from its normal 'high state' or maximum to a deep minimum (low state) in which it can remain for months or even years. The optical spectra of MV Lyr at minimum are characterized by the presence of narrow emission lines of H, He I, and very weak Ca II K. At maximum, He II 4686 disappears, and some of the He I lines are found in absorption. The continuum rises toward the blue, like that of a blackbody with temperature of about 15,000 K. The color index B-V is always negative, slightly higher at maximum (about -0.2) than at minimum (about -0.3). MV Lyr is compared with other typical members of the VY Sculptoris subclass of cataclysmic variables.
Marziani Paola
Romano Gennaro
Rosino Leonida
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