2010A&A...524A..86S -
Astronomy and Astrophysics, volume 524, A86-86 (2010/12-1)
Orbital periods of cataclysmic variables identified by the SDSS. VIII. A slingshot prominence in SDSS J003941.06+005427.5?
SOUTHWORTH J., MARSH T.R., GAENSICKE B.T., STEEGHS D. and COPPERWHEAT C.M.
Abstract (from CDS):
We present VLT spectroscopy and NTT photometry of the faint cataclysmic binary SDSS J003941.06+005427.5. This object shows triple-peaked Hα 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 Hα emission line. Using the GALEX and SDSS photometry of this object, we determine a white dwarf temperature of 15000K and a very late (>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 Hα and HeI 6678Å emission features show an accretion disc with a non-uniform brightness and departures from Keplerian flow. The third emission peak is detected only in Hα and at a relatively low velocity amplitude of 202±3km/s. 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.
Abstract Copyright:
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Journal keyword(s):
stars: dwarf novae - binaries: spectroscopic - novae, cataclysmic variables
VizieR on-line data:
<Available at CDS (J/A+A/524/A86): lc.dat obs.dat sp/*>
Simbad objects:
6
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