NDLI: Doppler tomography of the asynchronous polar BY Camelopardalis

Content Provider	EDP Sciences
Author	R. Schwarz A. D. Schwope A. Staude R. A. Remillard
Abstract	We present phase-resolved, high-resolution (1.3 Å) spectroscopy of the brightest near-synchronous polar BY Cam taken on two different occasions in 1998 and 1999. The first tomographic study of such a system reveals line emission spread out over a large velocity range forming a crescent at negative v_{y_{velocities in the Doppler maps. In contrast to the majority of synchronous AM Her systems there is only weak indication for the presence of a focused accretion stream. These two facts suggest that the majority of the matter is accreted via an extended curtain. Location and extent of the structure in the Doppler maps can be reproduced with a simple curtain model raised over a wide (~180°) range in azimuth implying that the ballistic stream stretches to a point far behind the white dwarf. In order to reach such small magnetospheric radii mass accretion rates a factor of 10 to 20 in excess of that normally seen in polars would be required. In addition to the curtain emission, the Balmer lines show a narrow emission line component likely originating from the heated side of the secondary star. Its velocity amplitude of 190 together with an illumination model of the secondary star suggests a rather heavy white dwarf of and an inclination larger than °. Timings of this feature in the present and historical data unequivocally determine the orbital period and have been used to establish a high-precision, long-term ephemeris.}}
Ending Page	220
Starting Page	213
Page Count	8
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2005/46/aa3711-05/aa3711-05.html
e-ISSN	14320746
Issue Number	1
Journal	Astronomy & Astrophysics
Volume Number	444
DOI	10.1051/0004-6361:20053711
Language	English
Publisher	EDP Sciences
Publisher Date	2005-12-01
Access Restriction	Open
Rights Holder	© ESO, 2005
Subject Keyword	accretion: accretion disks stars: binaries: close stars: novae, cataclysmic variables stars: magnetic fields accretion: accretion disks / stars: binaries: close / stars: novae, cataclysmic variables / stars: magnetic fields
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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