Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99q.142p&link_type=abstract
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.142
Astronomy and Astrophysics
Astronomy
Scientific paper
Over the decades, many different models have been suggested for how elementary particles interact at densities well above nuclear. The resulting different equations of state (EOS) predict different constituents in neutron stars and lead to different mass-radius relations. Distinguishing the various possibilities appears possibly only using empirical constraints on neutron stars, such as the maximum mass. The millisecond pulsar (MSP) PSR J1740-5340 is an excellent target for measuring an accurate mass, as it is in a binary with a bright (V~17) companion star. The binary also poses a number of intriguing puzzles. In particular, the companion is very luminous for its mass, does not show any sign of heating by the copious pulsar spin-down emission, and appears not to be corotating with the orbit despite nearly filling its Roche lobe and the orbit being circular. I will discuss the above questions in the light of new high-resolution UVES/VLT spectra from the companion star to PSR J1740-5340.
Pena Fernando
van Kerkwijk Marten
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