Igr J08408–4503: a New Recurrent Supergiant Fast X-ray Transient
نویسنده
چکیده
The supergiant fast X-ray transient IGR J08408–4503 was discovered by INTEGRAL on May 15, 2006, during a bright flare. The source shows sporadic recurrent short bright flares, reaching a peak luminosity of 10 erg s within less than one hour. The companion star is HD 74194, an Ob5Ib(f) supergiant star located at 3 kpc in the Vela region. We report the light curves and broad-band spectra (0.1–200 keV) of all the three flares of IGR J08408–4503 detected up to now based on INTEGRAL and Swift data. The flare spectra are well described by a power-law model with a high energy cut-off at ∼ 15 keV. The absorption column density during the flares was found to be ∼ 10 cm, indicating a very low matter density around the compact object. Using the supergiant donor star parameters, the wind accretion conditions imply an orbital period of the order of one year, a spin period of the order of hours and a magnetic field of the order of 10 G. Subject headings: X-rays: binaries – X-rays: bursts – X-rays: individual: IGR J08408–4503
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