How young are the low-mass X-ray binaries? Conclusions from a flux-limited sample

Details How young are the low-mass X-ray binaries? Conclusions from a flux-limited sample How young are the low-mass X-ray binaries? Conclusions from a flux-limited sample

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..929n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. 929-935.

Astronomy and Astrophysics

Astronomy

18

Chronology, Galactic Structure, Pulsars, Stellar Mass, X Ray Binaries, Galactic Bulge, Neutron Stars

Scientific paper

Low-mass X-ray binaries fall into two classes on the basis of their X-ray properties. Using a flux-limited sample from the Ariel V Sky Survey, we show that the class sometimes referred to as the X-ray bursters is associated with the Galactic disk, and probably has an age of only 10 exp 7 to 10 exp 8 yr, much younger than was previously thought. The short lifetime of these 'disk sources' explains why there are so many millisecond pulsars, and how a system such as Her X-1 can have a relatively massive secondary. Conversely, the 'bright blue sources' seem to be associated with a highly flattened, old, metal-rich inner bulge population.

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