The Precataclysmic Variable GD 245

Details The Precataclysmic Variable GD 245 The Precataclysmic Variable GD 245

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..398s&link_type=abstract

Astronomical Journal v.110, p.398

Astronomy and Astrophysics

Astronomy

27

Cataclysmic Variables, Stars: Individual: Gd 245

Scientific paper

A combined photometric/spectroscopic study has been carried out of the evolved binary GD 245. The system is shown to consist of a DA2 white dwarf plus M3-5 secondary in a 4.17 h orbit. From model fitting to the white dwarf spectral features, the primary star is found to have log g=7.77±0.02 and Teff=22170 K, leading to M1 (g)=0.48 Msun and R1=0.015 Rsun. Radial velocity analysis of the double-lined system implies M2=0.22 Msun. The distance is computed to be 61 pc and the orbital inclination is i≍69°. These parameters are consistent with the companion being a main-sequence object, in which case Teff=3S60 K, R2=0.27 Rsun, and the binary just escapes being an eclipsing system. A rich spectrum of emission lines phased in strength and radial velocity with the orbital motion is testimony to irradiation of a corotating secondary star by the white dwarf. However, the strength of this spectral component exceeds the intercepted Lyman continuum from the white dwarf, implying that alternate heating mechanisms are important. The companion underfills its Roche lobe by less than 25% in radius, and for current estimates of the angular momentum loss rate in close binaries will require less than 108 yr to evolve into contact. At the inception of mass transfer, the cataclysmic variable GD 245 will appear as one of the rare objects in the 2-3 h orbital period gap.

Affiliated with

Also associated with

No associations

Rating

The Precataclysmic Variable GD 245 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Precataclysmic Variable GD 245, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Precataclysmic Variable GD 245 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1169725