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The Mysterious Nature of HS 2331+3905

Published online by Cambridge University Press:  22 February 2018

S. Aranjo-Betancor ,
B. T. Gänsicke ,
H.-J. Hagen ,
T. R. Marsh ,
J. Thorstensen ,
E. T. Harlaftis ,
R. E. Fried  and
D. Engels
S. Aranjo-Betancor
Affiliation:
Space Telescope Science Institute, USA University of Southhampton, UK
B. T. Gänsicke
Affiliation:
University of Southhampton, UK University of Warwick, UK
H.-J. Hagen
Affiliation:
Hamburger Sternwarte, Germany
T. R. Marsh
Affiliation:
University of Southhampton, UK University of Warwick, UK
J. Thorstensen
Affiliation:
Dartmouth College, USA
E. T. Harlaftis
Affiliation:
Athens National Observatory, Greece
R. E. Fried
Affiliation:
Braeside ObsevatoryUSA
D. Engels
Affiliation:
Hamburger Sternwarte, Germany

Abstract

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We report the discovery of one unique cataclysmic variable drawn from the Hamburg Quasar Survey, HS 2331 + 3905. Follow-up observations obtained over three years unveiled a very unusual picture. The large amplitude 3.5 h radial velocity variations obtained from our optical spectroscopy is not the orbital period of the system, as one would normally expect. Instead, extensive CCD photometry strongly suggests that HS 2331 + 3005 is a short orbital period cataclysmic variable with Рorb = 81.09 min, containing a cold white dwarf which appears to exhibit ZZ Ceti pulsations.

Resumen

Resumen

Informamos sobre el descubrimiento de la única variable cataclísmica enana procedente del Hamburg Quasar Survey. HS 2331 + 3905. Las observaciones obtenidas durante tres años nos revelan un esquema inusual. La gran amplitud de 3.5 h de las variaciones en velocidad radial obtenidas a partir de espectroscopía óptica no es el período orbital del sistema, como se esperaría normalmente. Роr el contrario, fotometría CCD extensiva, sugiere fuertemente que HS 2331 + 3005 es una variable cataclísmica de corto periodo orbital con un Рorb = 81.09 min, que contiene una enana blanca, la cual parece exhibir pulsaciones ZZ Ceti.

Keywords

BinariesClose — Novae, Cataclysmic Variables — StarsIndividual (HS 2331+3905)
Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 190 - 191
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

References

Gänsicke, B. Т., Hagen, H.-J., & Engels, D. 2002, ASP Conf. Ser., 261, 190 Google Scholar
Hagen, H. J., Groote, D., Engels, D & Reimers, D. 1995. A&AS, 111, 195 Google Scholar
Kotak, R., van Kerkwijk, M.N., & Clemens, J. С. 2002, A&A, 388, 219 Google Scholar