EDP Sciences
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Volume 410, Number 1, October IV 2003
Page(s) 231 - 238
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031222

A&A 410, 231-238 (2003)
DOI: 10.1051/0004-6361:20031222

V1432 Aql: A polar or an intermediate polar?

K. P. Singh1 and V. R. Rana1, 2

1  Department of Astronomy & Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
    e-mail: singh@tifr.res.in, vrana@tifr.res.in
2  Joint Astronomy Programme, Department of Physics, Indian Institute of Science, Bangalore 560012, India

(Received 19 February 2003 / Accepted 25 July 2003)

We present evidence for a spin period of 4070 s in a magnetic cataclysmic variable V1432 Aql, classified as a polar. The evidence is based on the analysis of archival X-ray data obtained from a 25 ks long and uninterrupted observations with XMM-Newton. We also detect modulation of the X-ray flux with the orbital period, various harmonics of the spin period, and side-bands due to beating of the spin period with the orbital period. The energy-dependent light curves and hardness ratios show a very complex behaviour with both the spin phase and the orbital phase, indicating the presence of multiple absorbers of different densities. The observed characteristics suggest the presence of a disk in the system and accretion via a disk-overflow mechanism as is commonly observed in intermediate polars.

Key words: accretion, accretion disks -- stars: binaries: close -- stars: novae, cataclysmic variables -- stars: individual: V1432 Aql -- X-rays: stars

Offprint request: V. R. Rana, vrana@tifr.res.in

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