2002A&A...391.1013R


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.01CEST14:39:41

2002A&A...391.1013R - Astronomy and Astrophysics, volume 391, 1013-1022 (2002/9-1)

Super-Eddington outburst of V4641 Sgr.

REVNIVTSEV M., GILFANOV M., CHURAZOV E. and SUNYAEV R.

Abstract (from CDS):

X-ray transients provide unique opportunity to probe accretion regimes of at a vastly different accretion rates. We analyze a collection of the RXTE observations (Galactic Center scans, ASM monitoring and a pointed observation) of enigmatic transient source high mass X-ray binary V4641 Sgr and argue that they broadly support the hypothesis that giant September 1999 outburst was associated with an episode of super-Eddington accretion onto the black hole. During the outburst an extended optically thick envelope/outflow has been formed around the source making the observational appearance of V4641 Sgr in many aspects very similar to that of SS433. These results suggest that objects like V4641 Sgr and SS433 indeed represent the class of objects accreting matter at a rate comparable or above Eddington value and the formation of an envelope/outflow is a generic characteristic of supercritical accretion. When the accretion rate decreased the envelope vanished and the source short term variability and spectral properties started to resemble those of other galactic black hole candidates accreting at a rate well below the Eddington value. Interestingly that during this phase the source spectrum was very similar to the Cygnus X-1 spectrum in the low state inspite of more than order of magnitude larger X-ray luminosity.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - black hole physics - instabilities - stars: binaries: general - X-rays: general - X-rays: stars

Status at CDS:  

Simbad objects: 6

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Number of rows : 6

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* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1689 1
2 AX J1748.0-2829 LXB 17 48 05.060 -28 28 25.80           ~ 168 0
3 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 384 1
4 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1914 3
5 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2259 0
6 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3889 0

    Equat.    Gal    SGal    Ecl

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2020.04.01-14:39:41

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