De Martino, Domitilla, Matt, Giorgio, Mukai, Koji, Bonnet-Bidaud, Jean-Marc, Gänsicke, B. T. (Boris T.), Gonzalez Perez, J. M., Haberl, F., Mouchet, M. and Solheim, J.-E. (Jan-Erik). (2005) X-ray confirmation of the intermediate polar HTCam. Astronomy & Astrophysics, Vol.437 (No.3). pp. 935-945. ISSN 0004-6361

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Abstract

We report on the first pointed X-ray observations with XMM-Newton and RXTE satellites of the X-ray source RXJ0757.0+6306 = HT Cam. We detect a strong 515 s X-ray modulation confirming the optical photometric period found in 1998, which definitively assigns this source to the intermediate polar class of magnetic cataclysmic variables. The lack of orbital sidebands in the X-rays indicates that the X-ray period is the spin period of the accreting white dwarf. Simultaneous ultraviolet and optical B-band photometry acquired with the XMM-Newton Optical Monitor and coordinated optical UBVRI photometric data acquired at the Nordic Optical Telescope (La Palma) show that the optical pulse is in phase with the X-rays and hence originates in the magnetically-confined accretion flow. The lack of ultraviolet spin modulation suggests that accretion-induced heating on the white dwarf surface is not important in this source. Spectral analyses of XMM-Newton EPIC and RGS data show that HTCam has a multi-temperature spectrum and, contrary to most intermediate polars, it does not suffer from strong absorption. With its 86 min orbital period, HTCam is the third confirmed system of this class below the 2–3 h period gap accreting at a low rate.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Cataclysmic variable stars, X-ray sources, Galactic, Magnetic stars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	July 2005
Volume:	Vol.437
Number:	No.3
Page Range:	pp. 935-945
Identification Number:	10.1051/0004-6361:20052761
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Italy. Ministero dell'università e della ricerca scientifica e tecnologica, Instituto de Astrofísica de Andalucía
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URI:	http://wrap.warwick.ac.uk/id/eprint/3591

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