Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.7606d&link_type=abstract
American Astronomical Society Meeting 205, #76.06; Bulletin of the American Astronomical Society, Vol. 36, p.1473
Astronomy and Astrophysics
Astronomy
Scientific paper
Accurate measurements of neutron star masses are needed to constrain the equation of state of neutron star matter and to identify the evolutionary track of the progenitor stars that form neutron stars. The best measured values of the mass of 4U0900-40 (= Vela XR-1), 1.86 ± 0.16 and 1.93 ± 0.20 solar masses, make it the most massive neutron star known. The direct relationship between the maximum mass of neutron stars and the equation of state of dense matter makes 4U0900-40 the single most important neutron star mass to determine accurately. Previous mass estimates of 4U0900-40 have been obtained using non-dynamical methods. We describe here a dynamical method for determining the mass of 4U0900-40 using the reprocessed UV pulses emitted by its B0.5Ib companion, in which knowledge of the primary's rotational speed or the pattern of its X-ray illumination are unnecessary.
Boyd Patricia T.
Dolan James F.
Etzel Paul B.
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