HEAD 2000, November 2000
Session 25. X-Ray Binaries - Spectroscopy
Display, Wednesday, November 8, 2000, 8:00am-6:00pm, Bora Bora Ballroom

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[25.16] The Dust-Scattered Halo of OAO 1657-415 observed with ASCA

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

We report on two ASCA observations of 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. We find that the eclipse emission is dominated by a soft, spatially extended component whose intensity decreases through the eclipse. We attribute this to interstellar dust scattering. We use the decaying dust-scattered X-ray halo 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/spie2000/. 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@astro.isas.ac.jp

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