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Restrictions on the Scenario Parameters


In this section we show that the comparison between the calculated and observed numbers of the most ``fragile'' (from the point of view of the binary evolution scenario)  galactic binary types (such as X-ray low-mass X-ray binaries (LMXB), cataclysmic variables (CV),  Be-stars  with compact companions, relative number of visible binary radiopulsars  with normal and compact secondary components) impose certain constraints on the feasible initial binary mass ratio distribution chosen in a power-law form tex2html_wrap_inline10402 (see previous section). We show that the efficiency of removal of binary angular momentum during the CE stage is much less restricted, allowing a wide range tex2html_wrap_inline10404 -10. We specially study how different values of the kick velocity  imparted to a newborn NS taken from the range 0-1000 km stex2html_wrap_inline8853 change the results. We obtain that the kick velocity  of about tex2html_wrap_inline8945 200 km s tex2html_wrap_inline8853 would fit the existing data on relative numbers of binary radiopulsars  with normal and compact companions within a half-order of magnitude uncertainty. The high mean kick velocity of tex2html_wrap_inline8945 450 km s tex2html_wrap_inline8853 which appears to follow from recent radiopulsar measurements by Lyne and Lorimer (1994)[132]   gives two times worse fit with the observations, especially when accounting for galactic binary pulsar statistics (Lipunov et al., 1995f[130]).

Mike E. Prokhorov
Sat Feb 22 18:38:13 MSK 1997