Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..301w&link_type=abstract
NOAO Proposal ID #1999A-0301
Physics
Scientific paper
X-ray binaries represent one of only two means of obtaining the masses of neutron stars (NSs). The NS masses derived so far show a startlingly small dispersion, centered on 1.3+/-0.15 M_&sun;. However, these NS masses have been exclusively measured in young high mass systems with very similar evolutionary histories and the NSs in the much older low mass X-ray binaries (LMXBs) might have substantially different masses. The discovery of various high frequency oscillations in LMXBs in the X-ray has opened up new ways to determine the NS masses in these systems which has been notoriously difficult in the past. Recent models suggest that the observed oscillations imply NS masses of about 1.8 M_&sun;, substantially larger than NS masses determined previously. We propose to test this model and mass prediction through simultaneous X-ray and optical observations of the LMXB X1636-536. The system is unique in that it also exhibits doppler shifted burst oscillations that provide the radial velocity curve for the NS. Together with an independent donor mass estimate based on the period- mass relationship this allows for the determination of the NS mass.
Hoard Donald Wayne
Strohmayer T.,
Wachter Stefanie
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