AAS 197, January 2001
Session 84. X-ray Binaries
Display, Wednesday, January 10, 2001, 9:30am-7:00pm, Exhibit Hall

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[84.05] ASCA Observations of OAO 1657-415 and its Dust-Scattered X-Ray Halo

M. D. Audley, F. Nagase, K. Mitsuda (ISAS), L. Angelini (USRA / GSFC), R. L. Kelley (NASA / GSFC)

We report on two ASCA observations of the high-mass X-ray binary pulsar OAO~1657-415. A short observation near mid-eclipse caught the source in a low-intensity state. A later, longer observation of the source in its high state covered the eclipse ingress through mid-eclipse.

In the second observation we found that the eclipse continuum emission was dominated by a soft, spatially extended component whose intensity decreased through the eclipse. We interpret this component as a dust-scattered X-ray halo. We constructed surface brightness profiles from the ASCA SIS data and fit a simple model halo convolved with the telescope's point spread function. We thus extracted the energy and time dependence of the halo and used the results to place constraints on the nature of the interstellar dust and the distance to the source.

If you would like more information about this abstract, please follow the link to http://www.astro.isas.ac.jp/~audley/aas197/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: audley@iname.com

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