Rodríguez-Gil, P., Gaensicke, B. T., Hagen, H.-J., Nogami, D., Torres, M. A. P., Lehto, H., Aungwerojwit, A., Littlefair, S. P., Araujo-Betancor, S. and Engels, Dieter (2005) HS 0943+1404 : a true intermediate polar. Astronomy & Astrophysics, Vol.440 (No.2). pp. 701-709. doi:10.1051/0004-6361:20053141 ISSN 0004-6361.

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Abstract

We have identified a new intermediate polar, HS 0943+1404, as part of our ongoing search for cataclysmic variables in the Hamburg Quasar Survey. The orbital and white dwarf spin periods determined from time-resolved photometry and
spectroscopy are P orb 250 min and P spin = 69.171 ± 0.001 min, respectively. The combination of a large ratio P spin /P orb 0.3 and a long orbital period is very unusual compared to the other known intermediate polars. The magnetic moment of the white dwarf is estimated to be µ 1 ∼
10 34 Gcm 3, which is in the typical range of polars. Our extensive photometry shows that HS 0943+1404 enters into deep (∼3 mag) low states, which are also a characteristic feature of polars. We therefore suggest that the system is a true “intermediate” polar that will eventually synchronise, that is, a transitional object between intermediate polars and polars. The optical spectrum of HS 0943+1404 also exhibits a number of unusual emission lines, most noticeably N II λ5680, which is likely to reflect enhanced nitrogen abundances in the envelope of the secondary.

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 2005
Dates:	Date Event September 2005 Published
Volume:	Vol.440
Number:	No.2
Page Range:	pp. 701-709
DOI:	10.1051/0004-6361:20053141
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), United States. National Aeronautics and Space Administration (NASA)
Grant number:	Re 353/11 (DFG), Re 353/22 (DFG), NAG5-9930 (NASA)

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