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29 March 2024
 
  » arxiv » astro-ph/0506055

 Article overview


HS 0943+1404, a true intermediate polar
P. Rodriguez-Gil ; B. T. Gaensicke ; H.-J. Hagen ; D. Nogami ; M. A. P. Torres ; H. Lehto ; A. Aungwerojwit ; S. Littlefair ; S. Araujo-Betancor ; D. Engels ;
Date 2 Jun 2005
Subject astro-ph
Affiliation1,2), B. T. Gaensicke , H.-J. Hagen , D. Nogami , M. A. P. Torres , H. Lehto (6,7), A. Aungwerojwit , S. Littlefair , S. Araujo-Betancor , D. Engels ( University of Warwick, UK, Instituto de Astrofisica de Canarias, IAC, Spain, Hamburger Sternwarte
AbstractWe 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 Porb ~= 250 min and Pspin = 69.171 +- 0.001 min, respectively. The combination of a large ratio Pspin/Porb ~= 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 mu1 ~ 10^{34} G cm^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 NII 5680, which is likely to reflect enhanced nitrogen abundances in the envelope of the secondary.
Source arXiv, astro-ph/0506055
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