Evidence for Subsynchronous Rotation in HZ Herculis/Hercules X-1

Details Evidence for Subsynchronous Rotation in HZ Herculis/Hercules X-1 Evidence for Subsynchronous Rotation in HZ Herculis/Hercules X-1

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...503l..63l&link_type=abstract

Astrophysical Journal Letters v.503, p.L63

Astronomy and Astrophysics

Astronomy

13

Stars: Pulsars: Individual Name: Hercules X-1, X-Rays: Stars, Stars: Binaries: Eclipsing, Stars: Neutron, Stars: Individual Constellation Name: Hz Herculis

Scientific paper

An analysis of the orbit of Hercules X-1 is carried out, including results from recent X-ray and optical studies. Constraints on the binary parameters are given. Since HZ Herculis is required to be inside or filling its critical Roche lobe, no orbital solutions are allowed unless HZ Her's rotation rate is subsynchronous. This is consistent with the observed orbital period derivative. The alternative possibility is that the optical velocity of HZ Her is still not well determined. Assuming that it is correct, new upper and lower limits on the neutron star mass are derived: 1.23 Msolar

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