1998A&A...339L..21G


Query : 1998A&A...339L..21G

1998A&A...339L..21G - Astronomy and Astrophysics, volume 339, L21-24 (1998/11-1)

On the X-ray properties of V Sge and its relation to the supersoft X-ray binaries.

GREINER J. and VAN TEESELING A.

Abstract (from CDS):

We investigate the ROSAT X-ray properties of V Sge, which has been proposed to be related to supersoft X-ray binaries. During optical bright states, V Sge is a faint hard X-ray source, while during optical faint states (V>12mag), V Sge is a `supersoft' X-ray source. Spectral fitting confirms that V Sge's X-ray properties during its soft X-ray state may be similar to those of supersoft X-ray binaries, although a much lower luminosity cannot be excluded. It is possible to explain the different optical/X-ray states by a variable amount of extended uneclipsed matter, which during the optical bright states contributes significantly to the optical flux and completely absorbes the soft X-ray component. An additional, perhaps permanent, hard X-ray component, such as a bremsstrahlung component with a 0.1-2.4keV luminosity of ∼1030erg/s, must be present to explain the X-ray properties during the optical bright/hard X-ray state.

Abstract Copyright:

Journal keyword(s): accretion disks - cataclysmic variables - eclipsing binaries - X-rays: stars - stars: individual: V Sge

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 307 0
2 2E 1550 XB* 05 43 34.1600044704 -68 22 22.191505716   15.9   17.2 16.54 ~ 309 0
3 OGLE LMC-SC20 113500 EB* 05 46 46.54 -71 08 53.9     19.163   18.886 ~ 248 0
4 V* V Sge CV* 20 20 14.6911060272 +21 06 10.437106644   11.27 11.22 11.54   Be 203 0
5 EM* LkHA 170 Ae* 20 52 12.7783926120 +44 19 26.086865808           A0e 105 0

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2022.05.27-21:00:09

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