2005A&A...435....9K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET23:18:31

2005A&A...435....9K - Astronomy and Astrophysics, volume 435, 9-16 (2005/5-3)

Discovery of an X-ray binary in the outer SMC wing.

KAHABKA P. and HILKER M.

Abstract (from CDS):

The discovery of an X-ray binary RX J0209.6-7427 in the outer wing of the SMC is reported from two archival ROSAT PSPC observations. The data show variability in the X-ray light curve with a timescale of ∼40-days that probably is related to the binary orbital period of the system. A V=14mag star in the X-ray error circle of the source is the likely optical counterpart. The optical spectrum of the star shows Hα emission with an equivalent width of -10.8±0.2Å. The spectral type of the star is constrained as B0-B1.5IV-Ve and consistent with that of a Be star. RX J0209.6-7427 is therefore a Be-type X-ray binary. The mean X-ray luminosity of the source is derived to be ∼1.0x1038erg/s (for a distance of 60kpc), which is comparable to luminosities derived for Be-type X-ray binaries in the body of the SMC. This makes RX J0209.6-7427 the first candidate Be-type X-ray binary discovered in the outer SMC wing that directly extends into the Magellanic Bridge. This finding is consistent with the existence of a young (∼10-30Myr) stellar population in the outer region of the SMC wing. Star formation due to an encounter of the SMC with the LMC and the Magellanic system with the Galaxy may explain this likely high-mass X-ray binary in an area far from the main body of the SMC.

Abstract Copyright:

Journal keyword(s): Magellanic Clouds - X-rays: binaries - binaries: general - stars: individual: RX J0209.6-7427 - stars: variables: general

Nomenclature: Fig.3, Table 1: [KH2005] Star N (Nos 1-3), [KH2005] Star a (No. a).

Simbad objects: 12

goto Full paper

goto View the reference in ADS

Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9708 1
2 DEM S 171 HII 02 07 41 -73 54.2           ~ 9 0
3 ICA 16 As* 02 08 02 -74 19.9           ~ 7 0
4 [DI91] 532 * 02 08 58.4861384725 -74 24 45.084646965   16.93 17.10   16.90 ~ 2 0
5 RX J0209.6-7427 HXB 02 09 34.5370165010 -74 27 11.820291310     14.45     Be 20 0
6 2MASS J02094093-7427157 * 02 09 40.8716021058 -74 27 15.440633598   17.4 17.1     ~ 1 0
7 [DI91] 589 * 02 09 49.6074678497 -74 27 11.130706350   16.15 16.29 16.39 16.45 ~ 2 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5867 1
9 NAME Magellanic Bridge HI 03 11 -77.5           ~ 355 1
10 [HP99] 946 Be* 05 20 30.9009 -69 31 54.999   14.41 14.40     O8e 52 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15211 1
12 RX J0531.6-6518 HXB 05 31 36.0992 -65 18 16.024   15.86 16.02     B2V 12 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005A&A...435....9K and select 'bookmark this link' or equivalent in the popup menu


2021.03.04-23:18:31

© Université de Strasbourg/CNRS

    • Contact