Rodríguez-Gil, P., Gaensicke, B. T., Barwig, H., Hagen, H.-J. and Engels, Dieter (2004) Time-resolved photometry and spectroscopy of the new deeply-eclipsing SW Sextantis star HS 0728+6738. Astronomy & Astrophysics, Vol.424 (No.2). pp. 647-655. doi:10.1051/0004-6361:20040408

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Abstract

We present time-resolved optical spectroscopy and photometry, and far-ultraviolet spectroscopy of HS 0728+6738, a cataclysmic variable discovered in the Hamburg Quasar Survey. We show that the system is a new eclipsing member of the SW Sex class of CVs with an orbital period of 3.21 h. We derive an orbital inclination of ∼85 ± 4◦ from the average eclipse profile, making HS 0728+6738 the highest inclination SW Sex star known. The optical and far-ultraviolet emission lines are not or only weakly occulted during the eclipse, indicating the presence of line-emission sites either far outside the Roche lobe of the primary or, more likely, above the orbital plane of the binary. The photometric light curves exhibit fast variability with a period of ∼7 min, which might be related to the spin of the white dwarf.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	September 2004
Dates:	Date Event September 2004 Published
Volume:	Vol.424
Number:	No.2
Page Range:	pp. 647-655
DOI:	10.1051/0004-6361:20040408
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Deutsche Forschungsgemeinschaft (DFG)
Grant number:	Re 353/11 (DFG), Re 353/22 (DFG)

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