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

(2) University of California; (3) National University of Ireland; A. Golden (3); Galway); Santa Cruz; S. E. Thorsett (2); W. F. Brisken (1); W. M. Goss (1) ((1) National Radio Astronomy Observatory

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

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arxiv astro-ph/0306232 v1 pith:PBW2D3DG submitted 2003-06-11 astro-ph

W. F. Brisken (1) , S. E. Thorsett (2) , A. Golden (3) , W. M. Goss (1) ((1) National Radio Astronomy Observatory , (2) University of California , Santa Cruz , (3) National University of Ireland , Galway) This is my paper · ORCID

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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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