Neutron star masses: dwarfs, giants and neighbors |
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Authors: | Sergei Popov David Blaschke Hovik Grigorian Mikhail Prokhorov |
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Institution: | 1. Sternberg Astronomical Institute, Universitetski pr. 13, 119992, Moscow, Russia 2. Gesellschaft für Schwerionenforschung mbH (GSI), Planck str. 1, D-64291, Darmstadt, Germany 3. Bogoliubov Laboratory for Theoretical Physics, JINR Dubna, 141980, Dubna, Russia 4. Institut für Physik, Universit?t Rostock, D-18051, Rostock, Germany 5. Department of Physics, Yerevan State University, 375049, Yerevan, Armenia
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Abstract: | We discuss three topics related to the neutron star (NS) mass spectrum. At first we discuss the possibility to form low-mass
(M≲1M
⊙) objects. In our opinion this and suggest this is possible only due to fragmentation of rapidly rotating proto-NSs. Such
low-mass NSs should have very high spatial velocities which could allow identification. A critical assessment of this scenario
is given. However, the mechanism has its own problems, and so formation of such objects is not very probable. Secondly, we
discuss mass growth due to accretion for NSs in close binary systems. With the help of numerical population synthesis calculations
we derive the mass spectrum of massive (M>1.8M
⊙) NSs. Finally, we discuss the role of the mass spectrum in population studies of young cooling NSs. We formulate a kind of
mass constraint which can be helpful, in our opinion, in discussing different competitive models of the thermal evolution of NSs.
S.B.P. wants to thank the Organizers for support and hospitality. The work of S.B.P. was supported by the RFBR grant 06-02-16025
and by the “Dynasty” Foundation (Russia). The work of M.E.P.—by the RFBR grant 04-02-16720 and that of H.G. by DFG grant 436
ARM 17/4/05. |
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Keywords: | Neutron stars Pulsars Binary systems |
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