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

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dc.creatorGaensicke, B. T.
dc.creatorAraujo-Betancor, S.
dc.creatorHagen, H. -J.
dc.creatorHarlaftis, E.
dc.creatorKitsionas, S.
dc.creatorDreizler, S.
dc.creatorEngels, D.
dc.date2004-02-09
dc.date.accessioned2026-07-07T02:12:11Z
dc.date.available2026-07-07T02:12:11Z
dc.descriptionWe 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.
dc.descriptionAccepted for publication in A&A, 6 pages
dc.identifierhttps://arxiv.org/abs/astro-ph/0402189
dc.identifierhttp://arxiv.org/abs/astro-ph/0402189
dc.identifierAstron.Astrophys. 418 (2004) 265
dc.identifierdoi:10.1051/0004-6361:20035591
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7367
dc.subjectAstrophysics
dc.titleHS2237+8154: On the onset of mass transfer or entering the period gap?
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