The distance and radius of the neutron star PSR B0656+14

Details The distance and radius of the neutron star PSR B0656+14 The distance and radius of the neutron star PSR B0656+14

2003-06-11

arxiv.org/abs/astro-ph/0306232v1

Astrophys.J. 593 (2003) L89-L92

Astronomy and Astrophysics

Astrophysics

7 pages including 1 figure. Submitted to ApJL. AAStex

Scientific paper

10.1086/378184

We present the result of astrometric observations of the radio pulsar PSR B0656+14, made using the Very Long Baseline Array. The parallax of the pulsar is pi = 3.47 +- 0.36 mas, yielding a distance of 288 +33 -27 pc. This independent distance estimate has been used to constrain existing models of thermal x-ray emission from the neutron star's photosphere. Simple blackbody fits to the x-ray data formally yield a neutron star radius R_inf ~ 7-8.5 km. With more realistic fits to a magnetized hydrogen atmosphere, any radius between ~13 and ~20 km is allowed.

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