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J.A. Nousek (Penn State), C. Mauche (LLNL), F. Paerels (SRON)
1H0253+193 is a hard X-ray source, located by chance directly behind a dense, nearby molecular cloud. 1H0253+193 exhibits sharp, apparently total, eclipses which last for 1990~s, out of a 21,800~s orbit.
The large column density of dust, and the concentration of dust at a single position along the line of sight, make 1H0253+193 an ideal system for studying the time variable X-ray scattering halo as the central source goes into eclipse (as the halo dies away more slowly due to the longer pathlengths resulting from scattering).
We are scheduled to obtain Chandra ACIS monitoring of 1H0253+193 over an uninterrupted orbit during early August, 2000. We make our first results of the analysis of these data at this meeting.
JN acknowledges support from the Chandra Guest Observer program to make this work possible.
The author(s) of this abstract have provided an email address for comments about the abstract: nousek@astro.psu.edu