Catching VY Sculptoris in a low state

Abstract

Context. In the context of a large campaign to determine the system parameters of high mass transfer cataclysmic variables, we found VY Scl in a low state in 2008. Aims. Making use of this low state, we study the stellar components of the binary with little influence of the normally dominating accretion disc. Methods. Time-resolved spectroscopy and photometry of VY Scl taken during the low state are presented. We analysed the light-curve and radial velocity curve and use time-resolved spectroscopy to calculate Doppler maps of the dominant emission lines. Results. The spectra show narrow emission lines of Halpha, Hbeta, HeI, NaID, and FeII, as well as faint TiO absorption bands that trace the motion of the irradiated secondary star, and Halpha and HeI emission line wings that trace the motion of the white dwarf. From these radial velocities, we find an orbital period of 3.84 h, and put constraints on binary parameters such as the mass ratio M2/M1 of 0.43 and the inclination of 15 deg. With a secondary's mass between 0.3 and 0.35 Msol, we derive the mass for the white dwarf as M1 = 0.6-0.1 Msol.

arXiv comment8 pages, 9 figures, accepted for publication in A&A

References in corpus (9)

• An Exploration of the Paradigm for the 2-3 Hour Period Gap in Cataclysmic Variables
• The Stony Brook / SMARTS Atlas of mostly Southern Novae
• VY Sculptoris stars as magnetic CVs
• An atlas of line profile studies for SU UMa type cataclysmic variables
• Tidal torques, disc radius variations, and instabilities in dwarf novae and soft X-ray transients
• The fight for accretion: discovery of intermittent mass transfer in BB Doradus in the low state
• VV Pup in a low state: secondary-star irradiation or stellar activity?
• Far Ultraviolet Spectral Analysis of the Prototype Nova-Like Variable VY Sculptoris from the High State to the Low State
• Discovery of Halpha satellite emission in a low state of the SW Sextantis star BB Doradus

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