SIMBAD references

2013A&A...551A..96S - Astronomy and Astrophysics, volume 551A, 96-96 (2013/3-1)

RX J0123.4-7321, a Be/X-ray binary in the wing of the Small Magellanic Cloud.


Abstract (from CDS):

To confirm faint Be/X-ray binary candidates from the XMM-Newton survey of the Small Magellanic Cloud, we searched for X-ray outbursts in archival ROSAT observations. We found that RXJ0123.4-7321 was much brighter when detected with ROSAT than seen 16 years later by XMM-Newton. We analysed the ROSAT observations and the OGLE I-band light curve of the optical counterpart to investigate the nature of the system. High long-term variability in the X-ray flux of a factor of ∼150 was found between the ROSAT and XMM-Newton detections, indicating strong outburst activity during the ROSAT observations. The I-band light curve reveals long-term variability and regular outbursts with a period of (119.9±2.5) days, indicating the orbital period of the binary system. The large X-ray flux variations and the properties of the optical counterpart confirm RXJ0123.4-7321 as a new Be/X-ray binary in the wing of the Small Magellanic Cloud.

Abstract Copyright:

Journal keyword(s): Magellanic Clouds - galaxies: stellar content - stars: emission-line, Be - stars: neutron - X-rays: binaries

Simbad objects: 9

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