RXTE and XMM observations of intermediate polar candidates
Abstract
Aims: We aim to determine the credentials of nine candidate intermediate polars in order to confirm whether or not they are magnetic cataclysmic variables.
Methods: Frequency analysis of RXTE and XMM data was used to search for temporal variations that could be associated with the spin period of the magnetic white dwarf. X-ray spectral analysis was carried out to characterize the emission and absorption properties of each target.
Results: The hard X-ray light curve of V2069 Cyg shows a pulse period of 743.2 s, and its spectrum is fit by an absorbed bremsstrahlung model with an iron line, confirming this to be a genuine intermediate polar. The hard X-ray light curve of the previously confirmed intermediate polar IGR J00234+6141 is shown to be consistent with the previous low-energy X-ray detection of a 563.5 s pulse period. The likely polar IGR J14536-5522 shows no coherent modulation at the previously identified period of 3.1 h, but does exhibit a clear signal at periods likely to be harmonically related to it. Whilst our RXTE observations of RX J0153.3+7447, Swift J061223.0+701243.9, V436 Car, and DD Cir are largely too faint to give any definitive results, the observations of IGR J16167-4957 and V2487 Oph show some characteristics of intermediate polars, and these objects remain good candidates.
Conclusions: We confirmed one new hard X-ray selected intermediate polar from our sample, V2069 Cyg.
- Publication:
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Astronomy and Astrophysics
- Pub Date:
- February 2011
- DOI:
- 10.1051/0004-6361/201015848
- arXiv:
- arXiv:1011.5762
- Bibcode:
- 2011A&A...526A..77B
- Keywords:
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- binaries: general;
- X-rays: binaries;
- novae;
- cataclysmic variables;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Accepted for publication in A&