VLT Observations of the Ultraluminous X-ray Source NGC 1313 X-2

Details VLT Observations of the Ultraluminous X-ray Source NGC 1313 X-2 VLT Observations of the Ultraluminous X-ray Source NGC 1313 X-2

2005-10-04

arxiv.org/abs/astro-ph/0510085v2

Astrophys.J.633:L101-L104,2005

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/498448

We present archive ESO VLT photometric and spectroscopic data of the Ultraluminous X-ray source NGC 1313 X-2. The superb quality of the VLT images reveals that two distinct objects, with R magnitudes 23.7 and 23.6, are visible inside the Chandra error box. The two objects, separated by 0.75 arcsec, were unresolved in our previous ESO 3.6 m+EFOSC image. We show that both are stars in NGC 1313, the first a B0-O9 main sequence star of ~20 Msun, while the second a G supergiant of ~10 Msun. Irrespectively of which of the two objects the actual counterpart is, this implies that NGC 1313 X-2 is a high mass X-ray binary with a very massive donor.

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