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HS 0943+1404 : a true intermediate polar
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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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Official URL: http://dx.doi.org/10.1051/0004-6361:20053141
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 | ||||
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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: |
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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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