Issue |
A&A
Volume 396, Number 3, December IV 2002
|
|
---|---|---|
Page(s) | 895 - 910 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20021386 | |
Published online | 05 December 2002 |
The census of cataclysmic variables in the ROSAT Bright Survey*
1
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
2
Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse, 85740 Garching, Germany
3
South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, RSA
4
SRON, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
5
SAO RAS, Nizhnij Arkhyz, Zelenchukskaya, Karachaevo-Cherkesia, Russia, 357147
6
Universitäts-Sternwarte Göttingen, Geismarlandstr. 11, 37083 Göttingen, Germany
Corresponding author: A. D. Schwope, aschwope@aip.de
Received:
7
August
2002
Accepted:
19
September
2002
We give an identification summary and results of
polarimetric, photometric and spectroscopic follow-up
observations of new, X-ray bright
cataclysmic variables. These were identified as optical counterparts of
high galactic latitude sources in the ROSAT All-Sky Survey. This
optical identification programme is termed the ROSAT Bright Survey (RBS)
and represents the first complete soft X-ray selected, flux-limited sample
of CVs at high galactic latitude (survey area ∼20400 sq.deg.).
The systems described here escaped previous identification programmes
since these surveys were designed to identify even brighter than
ours or particularly
soft X-ray sources. Among the 11 new RBS-CVs we find 6 magnetic systems
of AM Herculis type, 4 dwarf novae (among them one candidate), and one
particularly bright system of
uncertain nature, tentatively identified as dwarf nova or symbiotic binary.
Orbital periods could be determined for all magnetic systems which range
from 87.1 min to 187.7 min. Three of the new dwarf novae have moderate
to high inclination and two of them might be eclipsing. Using non-magnetic
systems only we derive a space density of CVs of
pc-3. This limit rests on the two new
nearby, low-luminosity systems RBS0490 and
RBS1955, with estimated distances
of 30 pc only and luminosities below 1030 erg s-1.
Key words: Surveys / X-rays: binaries / stars: cataclysmic variables
© ESO, 2002
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