2003A&A...399..699R


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.29CEST06:49:50

2003A&A...399..699R - Astronomy and Astrophysics, volume 399, 699-702 (2003/2-4)

A possible 38 day X-ray period of KS 1731-260.

REVNIVTSEV M. and SUNYAEV R.

Abstract (from CDS):

We report the detection of a 38 day period of the X-ray transient and X-ray burster KS 1731-260. The periodicity was detected during Mar.1996-Aug.1998 (∼TJD 10150-11050) when the source had a high and relatively stable X-ray flux. After Sep.-Oct. 1998 (∼TJD 11100) the source became strongly variable on a time scale of months that contaminates the search for the 38 day periodicity. The detected period can not be a binary period. A binary with Roche lobe overflow has in this case large radii of the secondary and of the accretion disk. Illumination of the disk and secondary star by the X-ray flux from the luminous neutron star and inner disk, would lead to a high infrared brightness of the binary. That clearly contradicts the infrared data even for the brightest infrared sources within CHANDRA error box of KS 1731-260. A remaining possibility is that observed periodicity is connected with the accretion disk precession, similar to that was observed for, e.g. SS 433 and Her X-1.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual: KS 1731-260 - stars: binaries: general - stars: neutron - X-ray: 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 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 793 0
2 X LMC X-4 HXB 05 32 49.5558669817 -66 22 13.202534152   13.9 14.0     O8III 604 0
3 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1697 1
4 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1913 0
5 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 393 0
6 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1920 3

    Equat.    Gal    SGal    Ecl

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2020.05.29-06:49:50

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