Aungwerojwit, A., Gaensicke, B. T., Rodríguez-Gil, P., Hagen, H.-J., Harlaftis, E. T., Papadimitriou, C., Lehto, H., Araujo-Betancor, S., Heber, U., Fried, R. E., Engels, Dieter and Katajainen, S. (2005) HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049 : four new long-period cataclysmic variables. Astronomy & Astrophysics, Vol.443 (No.3). pp. 995-1005. doi:10.1051/0004-6361:20042610

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Abstract

We present time-resolved optical spectroscopy and photometry of four relatively bright (V ∼ 14.0−15.5) long-period cataclysmic variables(CVs) discovered in the Hamburg Quasar Survey: HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049. Their respective orbital periods, 243.69
± 0.49 min, 232.550 ± 0.049 min, 212.7 ± 0.2 min, and 225.90
± 0.23 min are determined from radial velocity and photometric variability studies. HS 0506+7725 is characterised by strong Balmer and He emission lines, short-period (∼10−20 min) flickering, and weak X-ray emission in the ROSAT All Sky Survey. The detection of a deep low state (B 18.5) identifies HS 0506+7725 as a member of the VY Scl
stars. HS 0139+0559, HS 0229+8016, and HS 0642+5049 display thick-disc like spectra and no or only weak flickering activity. HS 0139+0559 and HS 0229+8016 exhibit clean quasi-sinusoidal radial velocity variations of their emission lines but no or very little orbital photometricvariability. In contrast, we detect no radial velocity variation in HS 0642+5049 but a noticeable orbital brightness variation. We identify all three systems either as UX UMa-type novalike variables or as Z Cam-type dwarf novae. Our identification of these four new systems underlines that the currently known sample of CVs is rather incomplete even for bright objects. The four new systems add to the clustering of orbital periods in the 3−4 h range found in the sample of HQS selected CVs, and we discuss the large incidence of magnetic CVs and VY Scl/SW Sex stars found in this period range among the known population of CVs.

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:	December 2005
Dates:	Date Event December 2005 Published
Volume:	Vol.443
Number:	No.3
Page Range:	pp. 995-1005
DOI:	10.1051/0004-6361:20042610
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Thailand, Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
Grant number:	Re 353/11 (DFG), Re 353/22 (DFG)

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