Volume 410, Number 1, October IV 2003
|Page(s)||231 - 238|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
V1432 Aql: A polar or an intermediate polar?
Department of Astronomy & Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India e-mail: firstname.lastname@example.org, email@example.com
2 Joint Astronomy Programme, Department of Physics, Indian Institute of Science, Bangalore 560012, India
Corresponding author: V. R. Rana, firstname.lastname@example.org
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
© ESO, 2003
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