2004A&A...418..265G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST13:48:01

2004A&A...418..265G - Astronomy and Astrophysics, volume 418, 265-270 (2004/4-4)

HS 2237+8154: On the onset of mass transfer or entering the period gap?

GAENSICKE B.T., ARAUJO-BETANCOR S., HAGEN H.-J., HARLAFTIS E.T., KITSIONAS S., DREIZLER S. and ENGELS D.

Abstract (from CDS):

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 Hα radial velocity variations measured from time-resolved spectroscopy determine the orbital period to be Porb=178.10±0.08min. The optical spectrum of HS 2237+8154 is well described by a combination of a Teff=11500±1500K white dwarf (assuming logg=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±25pc. 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 Mwd=0.47-0.67M and Msec=0.2-0.4M. 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.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: individual: HS 2237+8154 - stars: novae, cataclysmic variables

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* LL Eri WD* 03 32 43.4695166384 -08 55 39.253882059   14.415 13.60     DA+M2.5V 34 0
2 V* QS Vir WD* 13 49 52.0031855330 -13 13 37.001934702 14.27 14.98 14.40 14.37   DA3+dM 122 1
3 2MASS J22371065+8209409 * 22 37 10.6558247347 +82 09 40.985738709   16.4 16.0     ~ 1 0
4 HS 2237+8154 WD* 22 37 15.5602204676 +82 10 27.357588994           DA2.8 22 1
5 2MASS J22373042+8212018 * 22 37 30.4002309504 +82 12 01.920902543   15.2 14.8     ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-13:48:01

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