HT Camelopardalis: The simplest intermediate polar spin pulse

Details HT Camelopardalis: The simplest intermediate polar spin pulse HT Camelopardalis: The simplest intermediate polar spin pulse

2005-03-23

arxiv.org/abs/astro-ph/0503489v1

Mon.Not.Roy.Astron.Soc. 359 (2005) 1531-1536

Astronomy and Astrophysics

Astrophysics

5 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09001.x

The intermediate polar HT Cam is unusual in that it shows no evidence for dense absorption in its spectrum. We analyse an XMM-Newton observation of this star, which confirms the absence of absorption and shows that the X-ray spin-pulse is energy independent. The modulation arises solely from occultation effects and can be reproduced by a simple geometrical model in which the lower accretion footprint is fainter than the upper one. We suggest that the lack of opacity in the accretion columns of HT Cam, and also of EX Hya and V1025 Cen, results from a low accretion rate owing to their being below the cataclysmic variable period gap.

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