2008A&A...485..183I


Query : 2008A&A...485..183I

2008A&A...485..183I - Astronomy and Astrophysics, volume 485, 183-194 (2008/7-1)

An X-ray and optical study of the ultracompact X-ray binary A 1246-58.

IN'T ZAND J.J.M., BASSA C.G., JONKER P.G., KEEK L., VERBUNT F., MENDEZ M. and MARKWARDT C.B.

Abstract (from CDS):

Result. are discussed of an X-ray and optical observation campaign of the low-mass X-ray binary A 1246-58 performed with instruments on Satellite per Astronomia X (``BeppoSAX''), the Rossi X-ray Timing Explorer (RXTE), the X-ray Multi-mirror Mission (``XMM-Newton''), the Swift mission, and the Very Large Telescope. Spectra and flux time histories are studied. The most important results are the lack of hydrogen spectral features in the optical spectrum, supporting the proposition that this is an ultracompact X-ray binary (UCXB), the determination of a 4.3kpc distance from time-resolved spectroscopy of thermonuclear X-ray bursts, and the detection of intermediately long thermonuclear bursts as seen in a number of other UCXBs. There is evidence for a Ne/O abundance ratio in the line of sight that is higher than solar and variable. This may be due to different changes in the ionization degrees of Ne and O, which may be related to the variable irradiating flux. We discuss the spectral variability and the peculiarities of the long-term light curve.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - X-rays: individual: A 1246-58 - accretion, accretion disks - stars: neutron

Simbad objects: 7

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Number of rows : 7
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 V* V1055 Ori LXB 06 17 07.3565603963 +09 08 13.515857360   18.80 18.5     ~ 545 1
2 4U 1246-58 LXB 12 49 39.364 -59 05 14.68   19.24 18.99     ~ 85 0
3 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 1997 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13192 0
5 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 361 0
6 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 953 1
7 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.3 13.0     A7Ib: 2034 4

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2022.10.01-13:54:47

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