Accretion stream mapping of HU Aquarii
نویسندگان
چکیده
منابع مشابه
Se p 19 98 Indirect imaging of the accretion stream in HU Aquarii
We apply our technique for indirect imaging of the accretion stream to UBVR eclipse profiles of HU Aqr obtained when the system was in a high state. We perform model fits to the eclipses using two geometries: one where the stream accretes onto one footpoint of the field line, and the other where the stream accretes onto both footpoints. We find that the stream brightness is not uniform, nor is ...
متن کاملModelling of the magnetic accretion flow in HU Aquarii
We present a magnetic stripping model for AM Her type objects. Our model is based on an equilibrium condition between ram pressure and magnetic pressure in a stiff dipolar magnetic field. We investigate the detailed geometry of the stripping process, most of which can be tackled analytically. By involving additional numerical calculations, the model allows the prediction of phase-resolved spect...
متن کاملDissecting the donor star in the eclipsing polar HU Aquarii
Medium-resolution spectroscopic observations with full phase coverage of the eclipsing polar HU Aqr are presented. Na i absorption and Ca ii emission lines are used to trace the secondary star. While the Na i lines seem to have contributions from both hemispheres of the donor star, the Ca ii lines were found to originate from the irradiated part of its surface alone. An irradiation model was ap...
متن کاملTwisted accretion curtains in the intermediate polar FO Aquarii
We report on a ∼ 37-ks XMM-Newton observation of the intermediate polar FO Aquarii, presenting X-ray and UV data from the EPIC and OM cameras. We find that the system has changed from its previously reported state of disc-overflow accretion to one of purely disc-fed accretion. We detect the previously reported ‘notch’ feature in the X-ray spin pulse, and explain it as a partial occultation of t...
متن کاملHunting high and low: XMM monitoring of the eclipsing polar HU Aquarii
Aims. We want to study the temporal and spectral behaviour of HU Aqr in the X-ray domain during different accretion states. Methods. We obtained spectra and light curves from four different XMM-Newton pointings covering intermediate and low states. The X-ray observations were accompanied with high time resolution photometry obtained with the Optima and ULTRACAM instruments. Results. On two occa...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2001
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2001.04100.x