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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
The ultraluminous X-ray source NGC 1313 X-2: Its optical counterpart and environment
Astronomy and Astrophysics, Volume 486, No. 1, Year 2008
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Description
NGC 1313 X-2 is one of the brightest ultraluminous X-ray sources in the sky, at both X-ray and optical wavelengths; therefore, quite a few studies of available ESO VLT and HST data have appeared in the literature. Here, we present our analysis of VLT/FORS1 and HST/ACS photometric data, confirming the identification of the ~ 23 mag blue optical counterpart. We show that the system is part of a poor cluster with an age of 20 Myr, leading to an upper mass limit of some 12 for the mass donor. We attribute the different results with respect to earlier studies to the use of isochrones in the F435W and F555W HST/ACS photometric system that appear to be incompatible with the corresponding Johnson and isochrones. The counterpart exhibits significant photometric variability of about 0.2 mag amplitude, both between the two HST observations and during the one month of monitoring with the VLT. This includes variability within one night and suggests that the light is dominated by the accretion disk in the system and not by the mass donor. © 2008 ESO.
Authors & Co-Authors
Soria, Roberto
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Motch, Christian
France, Strasbourg
Observatoire Astronomique de Strasbourg
Smith, Ian A.
United States, Houston
Rice University
Ryder, Stuart D.
Australia, Eastwood
Anglo Australian Observatory
Boettcher, M.
United States, Athens
Ohio University
Statistics
Citations: 64
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1051/0004-6361:200809557
ISSN:
14320746