2005A&A...444..213S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET07:09:55

2005A&A...444..213S - Astronomy and Astrophysics, volume 444, 213-220 (2005/12-2)

Doppler tomography of the asynchronous polar BY Camelopardalis.

SCHWARZ R., SCHWOPE A.D., STAUDE A. and REMILLARD R.A.

Abstract (from CDS):

We present phase-resolved, high-resolution (1.3Å) 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 vy 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 190km/s together with an illumination model of the secondary star suggests a rather heavy white dwarf of M1≥0.8M and an inclination larger than i≥40°. 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.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: novae, cataclysmic variables - stars: magnetic fields

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* UZ For AM* 03 35 28.6515678221 -25 44 21.765602833           M4.5 246 0
2 V* V1309 Ori AM* 05 15 41.4123841919 +01 04 40.479107028           M0.5 99 0
3 [HH95] BY Cam-9 * 05 42 40.6048170240 +60 52 18.825170639   15.383 13.497     ~ 2 0
4 V* BY Cam AM* 05 42 48.8013255299 +60 51 31.375887904   16.60       ~ 234 0
5 V* AR UMa CV* 11 15 44.5894046553 +42 58 22.427873664     16.4     D+M 127 0
6 V* AM Her AM* 18 16 13.2546541781 +49 52 04.759861155     12.30     M4.5 912 0
7 V* V1432 Aql AM* 19 40 11.4198615379 -10 25 25.771354347   16       ~ 145 0
8 V* QQ Vul AM* 20 05 41.9088490597 +22 39 58.839371205   14.4       M2 191 0
9 V* HU Aqr AM* 21 07 58.1945403160 -05 17 40.557984218   15.1   15.4   D+M4V 256 1
10 V* V1500 Cyg No* 21 11 36.5811336631 +48 09 01.950330133   17.9       ~ 746 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-07:09:55

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