UNSPECIFIED. (2005) HS0943+1404, a true intermediate polar. ASTRONOMY & ASTROPHYSICS, 440 (2). pp. 701-709. 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 similar or equal to 250 min and P-spin = 69.171 +/- 0.001 min, respectively. The combination of a large ratio P-spin/P-orb similar or equal to 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 mu(1) similar to 10(34) Gcm(3), which is in the typical range of polars. Our extensive photometry shows that HS 0943+ 1404 enters into deep (similar to 3mag) 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 NII lambda 5680, which is likely to reflect enhanced nitrogen abundances in the envelope of the secondary.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	ASTRONOMY & ASTROPHYSICS
Publisher:	EDP SCIENCES S A
ISSN:	0004-6361
Date:	September 2005
Volume:	440
Number:	2
Number of Pages:	9
Page Range:	pp. 701-709
Identification Number:	10.1051/0004-6361:20053141
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/6675

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