S E M I N A R IDepartament d'Astronomia i Astrofísica
Universitat de València
The Compact Object RX J185635-3754 and the Astrophysical Evidence for Quark Stars
Frederick M. Walter
State University of New York at Stony Brook
Seminari del departament d'Astronomia i Astrofísica
Dijous 05 juny 2003
Despite improved observational capabilities, surface and interior properties of neutron stars remain uncertain.In principle, multi-wavelength spectra can reveal their composition and angular diameters and constrain the interior equation of state, but the most recent observations have only opened more questions: The Chandra LETG spectrum of the brightest isolated neutron star is a featureless continuum. It has been recently claimed that this object is the first quark star ever seen. We discuss the latest observations and whether we are actually observing a strange star made of quark matter or a normal misoriented pulsar.