2006A&A...446L..17B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET22:58:28

2006A&A...446L..17B - Astronomy and Astrophysics, volume 446, L17-20 (2006/2-2)

Two new candidate ultra-compact X-ray binaries.

BASSA C.G., JONKER P.G., IN'T ZAND J.J.M. and VERBUNT F.

Abstract (from CDS):

We present the identification of the optical counterparts to the low-mass X-ray binaries 1A 1246-588 and 4U 1812-12. We determine the X-ray position of 1A 1246-588 from ROSAT/PSPC observations and find within the error circle a blue star with V=19.45, B-V=0.22 and R-I=0.22 which we identify as the counterpart. Within the Chandra error circle of 4U 1812-12, a single star is present which appears blue with respect to the stars in the vicinity. It has R=22.15, R-I=1.53. Distance estimates for both systems indicate that the optical counterparts are intrinsically faint, suggesting that they are ultra-compact X-ray binaries. These identifications would increase the number of candidate ultra-compact X-ray binaries from 2 to 4, whereas orbital periods are measured for only 7 systems in the Galactic disk.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - X-rays: individual: 1A 1246-588, 4U 1812-12

Nomenclature: Fig.1, text: [BJI2006] Star A (Nos A, X), [BJI2006] Single Star N=1.

Simbad objects: 4

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Number of rows : 4

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 SA 98- reg 06 52 04.1 -00 23 58           ~ 161 0
2 [BJI2006] Star A * 12 49 35.660 -59 05 12.94           ~ 1 0
3 4U 1246-58 LXB 12 49 39.364 -59 05 14.68   19.24 18.99     ~ 77 0
4 4U 1812-12 LXB 18 15 06.15 -12 05 46.7           ~ 104 2

    Equat.    Gal    SGal    Ecl

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2020.02.17-22:58:28

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