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Orbital periods of cataclysmic variables identified by the SDSS. VIII, A slingshot prominence in SDSS J003941.06 + 005427.5?
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Southworth, J., Marsh, T. R., Gaensicke, B. T., Steeghs, D. and Copperwheat, C. M. (2010) Orbital periods of cataclysmic variables identified by the SDSS. VIII, A slingshot prominence in SDSS J003941.06 + 005427.5? Astronomy & Astrophysics, Vol.524 . A86. doi:10.1051/0004-6361/201015633 ISSN 0004-6361.
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WRAP_Steeghs_Orbital_periods_1009.5478v1.pdf - Submitted Version Download (635Kb) | Preview |
Official URL: http://dx.doi.org/10.1051/0004-6361/201015633
Abstract
We present VLT spectroscopy and NTT photometry of the faint cataclysmic binary SDSS J003941.06+005427.5. This object shows triple-peaked Ha emission with all three peaks variable in both strength and velocity. We measure an orbital period of 91.395 +/- 0.093 min from the velocity variations of the wings of the Ha emission line. Using the GALEX and SDSS photometry of this object, we determine a white dwarf temperature of 15 000 K and a very late (greater than or similar to L2) spectral type for the companion star. These measurements, plus the relatively long orbital period, suggest that SDSS J003941.06+005427.5 may be a post-bounce cataclysmic variable. Doppler maps of the Ha and He I 6678 angstrom emission features show an accretion disc with a non-uniform brightness and departures from Keplerian flow. The third emission peak is detected only in Ha and at a relatively low velocity amplitude of 202 +/- 3 kms(-1). We are unable to explain this emission as arising from either the white dwarf, the secondary star, or the accretion disc. We tentatively attribute this mysterious central peak to a coronal loop anchored at the secondary star. If confirmed, this would be the first example of a slingshot prominence in a CV with a low mass-transfer rate and/or a fully convective secondary star.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Dwarf novae, Double stars -- Spectra, Stars, New, Cataclysmic variable stars | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | December 2010 | ||||
Dates: |
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Volume: | Vol.524 | ||||
Number of Pages: | 8 | ||||
Page Range: | A86 | ||||
DOI: | 10.1051/0004-6361/201015633 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC) | ||||
Grant number: | ST/F002599/1 (STFC) |
Data sourced from Thomson Reuters' Web of Knowledge
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