Can I read HS 0943+1404, a true intermediate polar on EtoBox?

HS 0943+1404, a true intermediate polar by Rodriguez-Gil, P.; Gaensicke, B. T.; Hagen, H. -J.; Nogami, D.; Torres, M. A. P.; Lehto, H.; Aungwerojwit, A.; Littlefair, S.; Araujo-Betancor, S.; Engels, D. is a scholarly article available to read on EtoBox.

What is HS 0943+1404, a true intermediate polar about?

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 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.

Author

Rodriguez-Gil, P.; Gaensicke, B. T.; Hagen, H. -J.; Nogami, D.; Torres, M. A. P.; Lehto, H.; Aungwerojwit, A.; Littlefair, S.; Araujo-Betancor, S.; Engels, D.

Published

2005

Language

EN