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{\Large {\bf 
               Influence of the IMF on the populations
           of X-ray sources after the starformation burst


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S.B. Popov, \\
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{{\large \bf (http://xray.sai.msi.su/\~ \,  polar)}}\\



{\Large {\bf

V.M. Lipunov, M.E. Prokhorov, K.A. Postnov\\

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{{\large \bf
Moscow State University\\

Sternberg Astronomical Institute
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{\Large

\centerline{{\bf Abstract}}
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{\large

    We use "Scenario Machine" -- the population synthesis
simulator -- to calculate the evolution of the populations of selected
types of X-ray sources after the starformation burst with the total mass
in binaries $(1$--$1.5) \cdot 10^6 M_{\odot}$ 
during the first 20 Myr after the burst.
We present here the results of the two sets of runs of the program.
In the first set we calculated the following types of close binaries:
transient sources- a neutron star with a Be- star; "X-ray pulsars"--
a neutron star in pair with a supergiant; Cyg X-1-like sources--
a black hole with a supergiant; "SS443-like sources"-- a superaccreting
black hole. 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 was sighnificantly
increased. With the "flat spectrum", suggested in (Contini et al, 1995),
and with the upper limit 120 $M_{\odot}$ we obtained about
hundred of sources of {\it all} calculated types.
Decreasing of the upper mass limmit delow the critical mass
of a black hole formation increase the number of transient sources   
with neutron stars up to $\approx 400$

In the second set we have results of  calculations of  evolution 
of the X-ray sources of 12 types for $\alpha=1.01$ and $\alpha=2.35$
for three upper mass limits: 120 $M_{\odot}$, 60 $M_{\odot}$, 40 $M_{\odot}$
(see Perez-Olia \& Colina 1995 about the choice of such upper limits)
on the same time scale 20 Myr after the starformation burst.

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