IGR J18483-0311: a new intermediate supergiant fast X-ray transient - AstrophysicsReportar como inadecuado

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Abstract: IGR J18483-0311 is a high-mass X-ray binary recently discovered by INTEGRAL.Its periodic fast X-ray transient activity and its position in the Corbetdiagram - although ambiguous - led to the conclusion that the source was alikely Be-X-ray binary BeXB, even if a supergiant fast X-ray transient SFXTnature could not be excluded. We aimed at identifying the companion star of IGRJ18483-0311 to discriminate between the BeXB and the SFXT nature of the source.Optical and near-infrared photometry, as well as near-infrared spectroscopy ofthe companion star were performed to identify its spectral type. We alsoassembled and fitted its broad-band spectral energy distribution to derive itsphysical parameters. We show that the companion star of IGR J18483-0311 is anearly-B supergiant, likely a B0.5Ia, and that its distance is about 3-4 kpc.The early-B supergiant nature of its companion star, as well as its fast X-raytransient activity point towards an SFXT nature of IGR J18483-0311.Nevertheless, the long duration and the periodicity of its outbursts, as wellas its high level of quiescence, are consistent with IGR J18483-0311 being anintermediate SFXT, in between classical supergiant X-ray binaries SGXBscharacterised by small and circular orbits, and classical SFXTs with large andeccentric orbits.

Autor: F. Rahoui, S. Chaty

Fuente: https://arxiv.org/

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