The Influence of the Initial Mass Function on Populations of X-ray Binaries After a Burst of Star Formation

Details The Influence of the Initial Mass Function on Populations of X-ray Binaries After a Burst of Star Formation The Influence of the Initial Mass Function on Populations of X-ray Binaries After a Burst of Star Formation

1998-12-22

arxiv.org/abs/astro-ph/9812416v2

Astronomy Reports, V. 42. P. 29-32 (1998), AZh V.75 N1. P.35-39

Astronomy and Astrophysics

Astrophysics

6 pages, 2 PostScript figures, in the replaced version reference to the russian variant of the article was added

Scientific paper

In this article we use "Scenario Machine" - the population synthesis simulator- to calculate the evolution of the populations of the selected types of X-ray sources after the starformation burst with the total mass in binaries $1.5\cdot10^6 M_{\odot}$ during the first 20 Myr after the burst. Sources of the four types were calculated: transient sources- accreting neutron stars with Be- stars; accreting neutron stars in pair with supergiants; Cyg X-1-like sources- black holes with supergiants; superaccreting black holes. We used two values of the $\alpha - coefficient$ in the mass-function: 2.35 (Salpeter's function) and 1.01 ("flat spectrum"). The calculations were made for two values of the upper limit of the mass-function: 120 and 30 $M_{\odot}$. For the flat spectrum the number of sources of all types significantly increased. Decreasing of the upper mass limit below the critical mass of a black hole formation increase (for the "flat spectrum") the number of transient sources with neutron stars up to $\approx 300$. We give approximating formulae for the time dependence of source numbers.

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