Other
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.8207a&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #82.07; Bulletin of the American Astronomical Society, Vol. 30, p.1156
Other
2
Scientific paper
Rosat X-ray data of the bright soft X-ray source RXJ185635-3754, combined with Hubble and other ground-based optical data, are consistent with thermal emission expected from a non-pulsing, isolated neutron star no older than a few million years. The X-ray and optical data are more consistent with non-magnetic atmospheres of pure Fe or Si-ash composition as opposed to a pure H and He composition. The inferred surface temperature is 42 +/- 4 eV for Fe and Si-ash model fits. The observed flux establishes the radius parameter R_∞ R/sqrt {1-2GM/Rc(2}) =~ 8+/- 2(D/25 pc) km in terms of the distance D. Realistic upper limits to the neutron star's mass (M < 3 Msun) and radius (R < 15 km) then limit the distance to D < 56 pc, which is consistent with the known upper limit of 120 pc for this source. Parallax measurements have the potential of constraining the neutron star radius. We show that a measurement of a neutrion star radius, unless it is less than about 10 km, does not effectively constrain the high-density of equation of state, but could contrain the symmetry properties of the nucleear force near nuclear density.
An Penghui
Lattimer James M.
Prakash Madappa
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