HS2237+8154: On the onset of mass transfer or entering the period gap?

Details HS2237+8154: On the onset of mass transfer or entering the period gap? HS2237+8154: On the onset of mass transfer or entering the period gap?

2004-02-09

arxiv.org/abs/astro-ph/0402189v1

Astron.Astrophys. 418 (2004) 265

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A, 6 pages

Scientific paper

10.1051/0004-6361:20035591

We report follow-up observations of a new white dwarf/red dwarf binary HS2237+8154, identified as a blue variable star from the Hamburg Quasar Survey. Ellipsoidal modulation observed in the R band as well as the Halpha radial velocity variations measured from time-resolved spectroscopy determine the orbital period to be Porb=178.10+-0.08min. The optical spectrum of HS2237+8154 is well described by a combination of a Teff=11500+-1500K white dwarf (assuming log g=8) and a dM3.5+-0.5 secondary star. The distance implied from the flux scaling factors of both stellar components is d=105+-25pc. Combining the constraints obtained from the radial velocity of the secondary and from the ellipsoidal modulation, we derive a binary inclination of i~50deg-70deg and stellar masses of Mwd=0.47-0.67Msun and Msec=0.2-0.4Msun. All observations imply that the secondary star must be nearly Roche-lobe filling. Consequently, HS2237+8154 may be either a pre-cataclysmic variable close to the start of mass transfer, or (considering its orbital period) a cataclysmic variable that terminated mass transfer and entered the period gap, or a hibernating nova.

Affiliated with

Also associated with

No associations

Rating

HS2237+8154: On the onset of mass transfer or entering the period gap? 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 HS2237+8154: On the onset of mass transfer or entering the period gap?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HS2237+8154: On the onset of mass transfer or entering the period gap? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-29792