The Hot White Dwarf in the Cataclysmic Variable MV Lyrae

Details The Hot White Dwarf in the Cataclysmic Variable MV Lyrae The Hot White Dwarf in the Cataclysmic Variable MV Lyrae

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...604..346h&link_type=abstract

The Astrophysical Journal, Volume 604, Issue 1, pp. 346-356.

Astronomy and Astrophysics

Astronomy

22

Accretion, Accretion Disks, Stars: Novae, Cataclysmic Variables, Stars: Individual: Constellation Name: Mv Lyrae, Ultraviolet: Stars, Stars: White Dwarfs

Scientific paper

We have obtained the first far-ultraviolet spectrum of the nova-like cataclysmic variable MV Lyrae using the Far Ultraviolet Spectroscopic Explorer (FUSE). We also obtained contemporaneous optical light curves and spectra. All data are from a deep faint accretion state of MV Lyr. We constructed a model for the system using the BINSYN software package; results from this model include the following: (1) The white dwarf has Teff=47,000K, photospheric logg=8.25, and metallicity of Z~0.3Zsolar. (2) The secondary star is cooler than 3500 K; it contributes nothing to the far-ultraviolet flux and a varying amount to the optical flux (from 10% at 5200 Å to 60% at 7800 Å). (3) The accretion disk, if present at all, contributes negligibly to the spectrum of MV Lyr. Irradiation considerations imply that the mass transfer rate is no more than 3×10-13Msolaryr-1. (4) Assuming no disk is present, the model optical light curve has an amplitude approximately 50% larger than that of the sinusoidal modulation (on the orbital period) in the observed optical light curve, suggesting that the secondary star might be shaded by a nascent disk and/or have starspots near the L1 point. (5) The scaling of the model spectrum to the observed data leads to a distance of d=505+/-50pc to MV Lyr.
This research is based on observations with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer, which is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985, and on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium.

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