Mid-infrared Observations of Twelve Supergiant X-ray Binaries Discovered by INTEGRAL

Details Mid-infrared Observations of Twelve Supergiant X-ray Binaries Discovered by INTEGRAL Mid-infrared Observations of Twelve Supergiant X-ray Binaries Discovered by INTEGRAL

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..242r&link_type=abstract

A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10

Other

Astronomical Observations, X-Ray Binaries, Neutron Stars

Scientific paper

We report here on mid-infrared (MIR) observations of the companion stars of twelve Supergiant X-ray Binaries (SGXBs) recently discovered by INTEGRAL. We aimed at assessing the contribution of the star and the material enshrouding the system compared to the total emission, as well as comparing the intrinsic absorptions of the compact object and the companion star.
By performing and fitting the optical to MIR broad-band Spectral Energy Distributions (SEDs) of the companion stars, we show that only three sources out of nine exhibit a warm MIR excess which can be explained by their peculiar nature. The lack of warm MIR excess in the other sources is expected as the winds of supergiant stars are not suitable for dust production and the presence of the compact object does not change this property.
At last, our results suggest the presence in the system of two components of absorption, the first one around the companion star, composed of cold material and the second one, very dense around the compact object, as the extinction in the X-ray domain is generally several order of magnitudes higher than the extinction in the visible.

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