Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..330..427r&link_type=abstract
The Astrophysics of Cataclysmic Variables and Related Objects, Proceedings of ASP Conference Vol. 330. Edited by J.-M. Hameury a
Astronomy and Astrophysics
Astrophysics
Scientific paper
Results from spectral analysis of X-ray data with the RXTE and XMM-Newton for an asynchronous polar V1432 Aql are presented based on two spectral models -- a multi-temperature plasma model and a photo-ionized plasma model. Using a multi-temperature plasma model, the RXTE PCA data are used to constrain the mass of the white dwarf to be 1.2±0.1 M&sun;. A strong soft X-ray excess below 0.8 keV, seen with XMM MOS, is modelled by a black body component having temperature of 80-90 eV. The emission lines seen at 6.7 and 7.0 keV are well fit using the multi-temperature plasma model, however the 6.4 keV line requires an additional Gaussian component. Two absorbers, one that fully covers the source and another that covers ˜ 65% of the source are required. The results from spin phase resolved spectroscopy indicate varying absorption parameters and varying 6.4 keV line flux. X-ray spectral characteristics and their variation with the spin period suggest that V1432 Aql is an unusual hot Polar. The photo-ionized plasma model with a range of column densities for the Fe ions gives a slightly better overall fit and fits all emission line features.
Barrett Paul Everett
Rana Vikram R.
Singh Kamal P.
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