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Дата изменения: Fri Jun 21 20:14:32 1996 Дата индексирования: Sat Dec 22 04:47:52 2007 Кодировка: Поисковые слова: arp 220 |
We assume that an instantaneous starburst occured in the region of the Galactic center, with half of the stars (in number) being formed in binaries. The total mass of the stars formed during the starburst was taken to be , as indicated by the Tamblyn & Rieke (1993) analysis. As for the size of the region that experienced the starburst, its particular value is of no importance for evaluating the numbers of various systems, and we address this issue in Sec. 3.2 while discussing the spatial distribution of massive systems after the starburst.
In order to obtain statistically significant results, the evolution of 300,000 binary systems was computed. Then we normalized the figures so as to be in agreement with the Tamblyn & Rieke (1993) calculations of the number of massive OB-stars (1,900 stars with ) that survived Myrs after the starburst onset (this age is supported below by an additional argument). In fact, the number of stars in IRS 16 estimated by Tamblyn & Rieke (1993) is uncertain within a factor of 2, but this is actually of no importance as long as we only use relative numbers of different X-ray source species.