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Issue A&A
Volume 406, Number 1, July IV 2003
Page(s) 213 - 219
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030787



A&A 406, 213-219 (2003)
DOI: 10.1051/0004-6361:20030787

1RXS J062518.2+733433: A new intermediate polar

S. Araujo-Betancor1, B. T. Gänsicke1, H.-J. Hagen2, P. Rodriguez-Gil1 and D. Engels2

1  Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
2  Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany

(Received 1 April 2003 / Accepted 30 April 2003)

Abstract
We report the identification of the cataclysmic variable 1RXS J062518.2+733433 as an intermediate polar. The orbital period of the system is determined to be $283.0\pm0.2$ min from the radial velocity variation of ${\mathrm H\alpha}$, measured in an extensive set of time-resolved spectra. Differential optical photometry obtained over a base line of three weeks reveals the presence of coherent variability with a period of $19.788\pm0.002$ min, which we suggest to be the white dwarf spin period. The power spectrum of our photometry also contains a strong signal near the spectroscopically-determined orbital period. The emission lines in 1RXS J062518.2+733433 display a complex multicomponent structure. In the trailed spectrogram of He I $\lambda$ 6678 we detect a narrow component with a radial velocity semi-amplitude of $\simeq$ 140 kms, consistent with a possible origin on the irradiated face of the secondary. The absence of eclipses gives an upper limit on the binary inclination of $i\la60^\circ$.


Key words: stars: binaries: close -- stars: individual: 1RXS J062518.2+733433 -- stars: novae, cataclysmic variables

Offprint request: S. Araujo-Betancor, sab@astro.soton.ac.uk

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