C.D.S. - SIMBAD4 rel 1.7 - 2019.10.15CEST09:39:14

2007A&A...465L..35L - Astronomy and Astrophysics, volume 465, L35-38 (2007/4-3)

Hard X-ray flares in IGR J08408-4503 unveil clumpy stellar winds.


Abstract (from CDS):

A 1000-s flare from a new hard X-ray transient, IGR J08408-4503, was observed by INTEGRAL on May 15, 2006 during the real-time routine monitoring of IBIS/ISGRI images performed at the INTEGRAL Science Data Centre. The flare, detected during a single one-hour long pointing, peaked at 250 mCrab in the 20-40keV energy range. Multi-wavelength observations, combining high-energy and optical data, were used to unveil the nature of IGR J08408-4503. A search in all INTEGRAL public data for other bursts from IGR J08408-4503 was performed, and the detailed analysis of another major flare is presented. The results of two Swift Target of Opportunity observations are also described. Finally, a study of the likely optical counterpart, HD 74194, is provided. IGR J08408-4503 is very likely a supergiant fast X-ray transient (SFXT) system. The system parameters indicate that the X-ray flares are probably related to the accretion of wind clumps on a compact object orbiting about 1013cm from the supergiant HD 74194. The clump mass loss rate is of the order of 10–6M/yr. Hard X-ray flares from SFXTs allow to probe the stellar winds of massive stars, and could possibly be associated with wind perturbations due to line-driven instabilities.

Abstract Copyright:

Journal keyword(s): gamma rays: observations - stars: supergiants - X-rays: individuals: IGR J08408-4503

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
1 RX J0535.6-6651 HXB 05 35 40.9965654015 -66 51 53.522991468   13.7 13.8     B0.5IIIe 277 0
2 HD 74194 HXB 08 40 47.7915105936 -45 03 30.231146034 7.05 7.77 7.55 8.70   O8.5Ib-II(f)p 174 0

    Equat.    Gal    SGal    Ecl

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