Based
on space observations collected with the BeppoSAX X-Ray
Astronomy Satellite which is a program of the Agenzia Spaziale
Italiana with participation of the Netherlands Agency for
Aerospace Programs, and on spectroscopic observations
obtained at the Laboratório Nacional de Astrofísica (LNA/MCT),
Brazil, and at the Complejo Astronomico
El Leoncito (CASLEO), Argentina.
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