Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379l..17n&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. L17-L20. Research supported by NSF and US
Astronomy and Astrophysics
Astronomy
308
Binary Stars, Black Holes (Astronomy), Milky Way Galaxy, Neutron Stars, Statistical Analysis, Massive Stars, Stellar Evolution, Stellar Gravitation
Scientific paper
A statistical analysis of the number and birthrate of double neutron star (NS-NS) binaries is presented. It is estimated that there are approximately 10 exp 4.5 z0 such systems in the Galaxy, with a birthrate of approximately 10 exp -5 z0 per year, where z0 is their scale height. It is found that merges of NS-NS binaries through gravitational radiation losses should be occurring roughly once a year in galaxies within 200/h Mpc. It is suggested that progenitor stars more massive than about 50 solar masses form black holes. The number and formation rate of BH-NS binaries in the Galaxy are estimated to be comparable to the corresponding estimates of NS-NS binaries. It is predicted that a BH-NS binary is likely to be discovered in pulsar surveys.
Narayan Ramesh
Piran Tsvi
Shemi Amotz
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