IGR J08408-4503中的硬X射线耀斑揭示了星团恒星风
Hard X-ray flares in IGR J08408-4503 unveil clumpy stellar winds
摘要：
内容：2006年5月15日，在INTEGRAL科学数据中心对IBIS/ISGRI图像进行实时例行监测期间，INTEGRAL观测到一个新的硬X射线瞬变IGR J 08408 -4503产生的1000秒耀斑。耀斑，在一个单一的一个小时长的指向检测到，在20-40千电子伏的能量范围内达到峰值250 mCrab。目的：结合高能和光学数据的多波长观测，揭示IGR J 08408 -4503的性质。研究方法：对IGR J 08408 -4503的所有INTEGRAL公开数据进行了搜索，并对另一个主要耀斑进行了详细分析。还描述了两次机会目标观测的结果。最后，研究可能的光学对应物，HD 74194，提供。结果：IGR J 08408 -4503极有可能是一个超巨星快速X射线瞬变（SFXT）系统。系统参数表明，X射线耀斑可能与距超巨星HD 74194约1 E13 cm的致密天体上风团的吸积有关。团的质量损失率约为1 E-6太阳质量/年。结论：来自SFXT的硬X射线耀斑允许探测大质量恒星的恒星风，并且可能与由于线驱动不稳定性引起的风扰动有关。
英文摘要：
Context : 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 20-40 keV energy range. Aims : Multi-wavelength observations, combining high-energy and optical data, were used to unveil the nature of IGR J08408-4503. Methods : 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. Results : 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 1E13 cm from the supergiant HD 74194. The clump mass loss rate is of the order of 1E-6 solar mass/yr. Conclusions : 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.
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