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HS 2331+3905: The cataclysmic variable that has it all
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UNSPECIFIED (2005) HS 2331+3905: The cataclysmic variable that has it all. ASTRONOMY & ASTROPHYSICS, 430 (2). pp. 629-642. doi:10.1051/0004-6361:20041736 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20041736
Abstract
We report detailed follow-up observations of the cataclysmic variable HS 2331+3905, identified as an emission-line object in the Hamburg Quasar Survey. An orbital period of 81.08 min is unambiguously determined from the detection of eclipses in the light curves of HS 2331+3905. A second photometric period is consistently detected at P similar or equal to 83.38 min, similar to2.8% longer than P-orb, which we tentatively relate to the presence of permanent superhumps. High time resolution photometry exhibits short-timescale variability on time scales of similar or equal to5-6 min which we interpret as non-radial white dwarf pulsations, as well as a coherent signal at 1.12 min, which is likely to be the white dwarf spin period. A large-amplitude quasi-sinusoidal radial velocity modulation of the Balmer and Helium lines with a period similar to3.5 h is persistently detected throughout three seasons of time-resolved spectroscopy. However, this spectroscopic period, which is in no way related to the orbital period, is not strictly coherent but drifts in period and/or phase on time scales of a few days. Modeling the far-ultraviolet to infrared spectral energy distribution of HS 2331+3905, we determine a white dwarf temperature of T-eff similar or equal to 10 500 K ( assuming M-wd = 0.6 M-circle dot), close to the ZZCeti instability strip of single white dwarfs. The spectral model implies a distance of d = 90 +/- 15 pc, and a low value for the distance is supported by the large proper motion of the system, mu = 0.14" yr(-1). The non-detection of molecular bands and the low J, H, and K fluxes of HS 2331+3905 make this object a very likely candidate for a brown-dwarf donor.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Journal or Publication Title: | ASTRONOMY & ASTROPHYSICS | ||||
Publisher: | E D P SCIENCES | ||||
ISSN: | 0004-6361 | ||||
Official Date: | February 2005 | ||||
Dates: |
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Volume: | 430 | ||||
Number: | 2 | ||||
Number of Pages: | 14 | ||||
Page Range: | pp. 629-642 | ||||
DOI: | 10.1051/0004-6361:20041736 | ||||
Publication Status: | Published |
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