2005年9月
HS0943+1404, a true intermediate polar
ASTRONOMY & ASTROPHYSICS
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- ,
- 巻
- 440
- 号
- 2
- 開始ページ
- 701
- 終了ページ
- 709
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1051/0004-6361:20053141
- 出版者・発行元
- EDP SCIENCES S A
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.
- リンク情報
- ID情報
-
- DOI : 10.1051/0004-6361:20053141
- ISSN : 0004-6361
- Web of Science ID : WOS:000231547400037