Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545320r&link_type=abstract
American Astronomical Society, AAS Meeting #215, #453.20; Bulletin of the American Astronomical Society, Vol. 42, p.466
Other
Scientific paper
We present a new mass for the neutron star in the X-ray pulsar binary 4U 1538-52. Following the approach in van der Meer et al. (2007, A&A, 473, 523) we use high resolution spectral data taken in July and August 2009 to obtain an improved radial velocity measurement for the optical companion. We also create an optical light curve from BVI images taken in June - September 2009 to confirm the system's eccentricity and provide the companion star's Roche lobe filling factor. These parameters together with the previously determined orbital period, duration of the X-ray eclipse, and projected semimajor axis of the pulsar's orbit can be combined to yield the masses of both stars. We use an "exact” numerical code based on Roche geometry and a genetic optimizer to accomplish this. Our technique can be applied to other X-ray pulsar systems as new observations are made. This research is supported in part by the National Science Foundation Grant AST-0808145.
Bailyn Charles D.
Buxton Michelle M.
McClintock Jeff E.
Orosz Jerome A.
Rawls Meredith L.
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