A Pre-Cataclysmic Variable

Details A Pre-Cataclysmic Variable A Pre-Cataclysmic Variable

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.2102s&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #21.02; Bulletin of the American Astronomical Society, Vol. 26, p.1344

Astronomy and Astrophysics

Astronomy

1

Scientific paper

GD 245 is a cataloged white dwarf which has been recently found to exhibit short-term radial velocity variations by at least three independent groups. Our discovery arose from a search for magnetic fields among DA white dwarfs, which found the star to be nonmagnetic at the level of a few tens of kilogauss. Photometric and spectroscopic monitoring of GD 245 presented here reveal that the object is a noneclipsing double-lined spectroscopic binary with mass ratio q=M_1/M_2=2.0 and a very short period of P=4.2 hr. A mass determination of the white dwarf primary from line profile analysis yields M_1=0.48 \msun, hence M_2=0.24 \msun. Assuming a main-sequence structure, the secondary star underfills its Roche lobe by no more than 20% in radius. A rich emission-line spectrum and red continuum from the inner hemisphere of the heated secondary are phased in strength with the orbital period, signifying tidal corotation. However, there is no evidence for a disk component such as would be expected if mass-transfer had been initiated. For typical evolutionary scenarios, contact will occur within a few million years.

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