Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-18
Astronomy and Astrophysics
Astrophysics
2 pages, to appear in the Proceedings of the IAU Symposium No. 230
Scientific paper
10.1017/S1743921306008751
We propose that the observed difference in the formation rates of bright low-mass X-ray binaries in metal-rich and metal-poor globular clusters can be explained by taking into account the difference in the stellar structure of main sequence donors with masses between ~0.85 Msun and ~1.25 Msun at different metallicities. This difference is caused by the absence of an outer convective zone in metal-poor main sequence stars in this mass range. In the result, magnetic braking, a powerful mechanism of orbital shrinkage, does not operate and dynamically formed main sequence - neutron star binaries fail to start mass transfer or appear as bright low-mass X-ray binaries.
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