Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........68l&link_type=abstract
Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1991.Source: Dissertation Abstracts International, Volume: 52-10, Secti
Astronomy and Astrophysics
Astronomy
Companion Star, Binary Star
Scientific paper
We studied the scattering and reprocessing of X-radiation in the wind and atmosphere of the early type companion star of a massive X-ray binary system using a Monte Carlo scatter code. The results of numerous Monte Carlo simulations are compared with data from an observation of the massive X-ray binary system 4U0900-40 made with the Japanese X-ray astronomy satellite Ginga. The radial mass density profile of the companion star was found to be inconsistent with that which is predicted by simple radiatively driven wind theories. However, it was found that the addition of an ad hoc exponential atmosphere to the density profile resulted in an accurate reproduction of the observed X-ray behavior of the system, including the shape of the eclipse transitions, and the X-ray spectrum during both the eclipse and the eclipse egress. Based on the Monte Carlo simulations, constraints have been placed on the abundance of Fe in the circum-stellar matter, and the radius of the companion star. These calculations can provide a framework for the interpretation of the spectra and light-curves other massive X-ray binaries. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253 -1690.).
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