2001A&A...376L..17S

Query : 2001A&A...376L..17S

2001A&A...376L..17S - Astronomy and Astrophysics, volume 376L17-21 (2001/9-3)

VLT optical observations of V821 Ara(= GX 339-4) in an extended ``off'' state.

SHAHBAZ T., FENDER R. and CHARLES P.A.

Abstract (from CDS):

We report on low-resolution spectroscopy of GX 339-4 during its current, extended X-ray ``off'' state in May 2000 (r=20.1) obtained with the VLT Focal Reducer/low dispersion Spectrograph (FORS1). Although we do not positively detect the secondary star in GX 339-4 we place an upper limit of 30 percent on the contribution of a ``normal'' K-type secondary star spectrum to the observed flux. Using this limit for the observed magnitude of the secondary star, we find a lower limit for the distance of GX 339-4 to be 5.6 kpc.

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Journal keyword(s): stars: individual: GX 339-4 - stars: X-rays - stars: accretion, accretion disks - black hole physics

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 - 2026 		#notes
1 HD 120033 ** 13 47 13.3925199528 -09 42 34.007985072   7.472 6.049     K3III 40 0
2 HD 122430 * 14 02 22.7821310616 -27 25 47.192750976   6.799 5.469     K2/3III 51 1
3 HD 149632 SB* 16 35 26.2877611008 +17 03 26.427758652   6.456 6.403     A1V 60 0
4 V* V821 Ara LXB 17 02 49.3876391280 -48 47 23.087954544         15.322 ~ 2237 0
5 HD 155111 * 17 10 37.6447074984 -27 00 18.933997032   10.64 8.52     K5(III) 8 0
6 HD 157423 * 17 25 33.4241966640 -48 07 20.155244376   10.52 9.30     K1III 6 0

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