Volume 516, June-July 2010
|Number of page(s)||4|
|Section||Stellar structure and evolution|
|Published online||22 July 2010|
Unveiling the nature of IGR J16493-4348 with IR spectroscopy*
Observatorio Astronómico de la Universidad de Valencia, Calle Catedrático Agustín Escardino 7, 46980 Paterna, Valencia, Spain e-mail: email@example.com
2 Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
Accepted: 8 April 2010
Context. The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) is discovering a large number of new hard X-ray sources, many of them being HMXBs. The identification and spectral characterization of their optical/infrared counterparts is a necessary step in undertaking a detailed study of these systems.
Aims. In a previous paper, we presented spectral analyses and classifications of six newly discovered INTEGRAL sources. In this paper, we extend the analysis to IGR J16493–4348.
Methods. We used the ESO/VLT ISAAC spectrograph to observe the proposed IR counterpart to the source, obtaining a Ks medium-resolution spectrum (R = 500) with a signal-to-noise ratio (S/N) 150. We classified the source by comparing with published atlases.
Results. We spectrally classified the source as a B0.5-1 supergiant and estimated its interstellar extinction. We compared the extinction derived from X-ray data with effective interstellar extinction obtained from our data, discussing the absorption component associated with the circumstellar environment.
Key words: X-rays: binaries / binaries: symbiotic / accretion, accretion disks / infrared: stars
© ESO, 2010
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