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HS 2237+8154 : on the onset of mass transfer or entering the period gap?
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Gaensicke, B. T., Araujo-Betancor, S., Hagen, H.-J., Harlaftis, E. T., Kitsionas, S., Dreizler, S. and Engels, Dieter (2004) HS 2237+8154 : on the onset of mass transfer or entering the period gap? Astronomy & Astrophysics, Vol.418 (No.1). pp. 265-270. doi:10.1051/0004-6361:20035591 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20035591
Abstract
We report follow-up observations of a new white dwarf/red dwarf binary HS 2237+8154, identified as a blue variable star from the Hamburg Quasar Survey. Ellipsoidal modulation observed in the R band as well as the radial velocity variations measured from time-resolved spectroscopy determine the orbital period to be Porb = 178.10 +- 0.08 min. The optical spectrum of HS 2237+8154 is well described by a combination of a Teff = 11500 +- 1500 K white dwarf (assuming log g = 8) and a dM 3.5 +- 0.5 secondary star. The distance implied from the flux scaling factors of both stellar components is d = 105 +- 25 pc. Combining the constraints obtained from the radial velocity of the secondary and from the ellipsoidal modulation, we derive a binary inclination of i = 50-70 and stellar masses of and Mwd = 0.47-0.67 M and Msec = 0.2-0.4 M. All observations imply that the secondary star must be nearly Roche-lobe filling. Consequently, HS 2237+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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Cataclysmic variable stars | ||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||
| Publisher: | EDP Sciences | ||||
| ISSN: | 0004-6361 | ||||
| Official Date: | April 2004 | ||||
| Dates: |
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| Volume: | Vol.418 | ||||
| Number: | No.1 | ||||
| Page Range: | pp. 265-270 | ||||
| DOI: | 10.1051/0004-6361:20035591 | ||||
| Status: | Peer Reviewed | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Funder: | Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Deutsche Forschungsgemeinschaft (DFG) | ||||
| Grant number: | Re 353/11 (DFG), Re 353/22 (DFG) |
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