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Time-resolved photometry and spectroscopy of the new deeply-eclipsing SW Sextantis star HS 0728+6738

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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 ISSN 0004-6361.

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Official URL: http://dx.doi.org/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, Engineering and Medicine > 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:
DateEvent
September 2004Published
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 (Creative Commons)
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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