期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 419, 期 3, 页码 2695-2702出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.19916.x
关键词
X-rays: binaries; X-rays: individual: IGR J16418-4532
资金
- SFXT
- ASI-INAF [I/009/10/0]
- PSU by NASA [NAS5-00136]
- Autonomous Region of Sardinia [L.R. 7/2007]
- UK Space Agency [ST/J000841/1] Funding Source: researchfish
We report on the Swift monitoring of the candidate supergiant fast X-ray transient (SFXT) IGR J16418-4532, for which both orbital and spin periods are known (similar to 3.7 d and similar to 1250 s, respectively). Our observations, for a total of similar to 43 ks, span over three orbital periods and represent the most intense and complete sampling of the light curve of this source with a sensitive X-ray instrument. With this unique set of observations, we can address the nature of this transient. By applying the clumpy wind model for blue supergiants to the observed X-ray light curve, and assuming a circular orbit, the X-ray emission from this source can be explained in terms of the accretion from a spherically symmetric clumpy wind, composed of clumps with different masses, ranging from similar to 5 x 10(16) to 10(21) g. Our data suggest, based on the X-ray behaviour, that this is an intermediate SFXT.
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