The Galactic Distribution of Low-Mass X-Ray Binaries

Details The Galactic Distribution of Low-Mass X-Ray Binaries The Galactic Distribution of Low-Mass X-Ray Binaries

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447l..33v&link_type=abstract

Astrophysical Journal Letters v.447, p.L33

Astronomy and Astrophysics

Astronomy

67

Galaxy: Kinematics And Dynamics, Stars: Binaries: Close, Stars: Neutron, X-Rays: General

Scientific paper

We have analyzed the Galactic distribution of low-mass X-ray binaries (LMXBs) in which the accreting compact object is a neutron star. The rms value of their distances, z, to the Galactic plane equals ~1 kpc. This wide z-distribution cannot be explained by systemic velocities that increased as a result of sudden symmetric mass loss at the formation of the neutron star alone. Kick velocities imparted on the neutron star, following the radio pulsar velocity distribution recently derived by Lyne & Lorimer (1994) can account for the LMXB z-distribution. This distribution is consistent with formation of the neutron stars in LMXBs from direct collapse of a helium star and also from accretion-induced collapse of a white dwarf. The triple-star evolution proposed by Eggleton & Verbunt is not a dominant production mechanism for LMXBs.

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