The Proper Motion, Parallax, and Origin of the Isolated Neutron Star RX J185635-3754

Details The Proper Motion, Parallax, and Origin of the Isolated Neutron Star RX J185635-3754 The Proper Motion, Parallax, and Origin of the Isolated Neutron Star RX J185635-3754

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.3313w&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #33.13; Bulletin of the American Astronomical Society, Vol. 32, p.1242

Astronomy and Astrophysics

Astronomy

Scientific paper

HST WFPC2 obervations over a 3 year baseline have yielded the proper motion and parallax of the isolated neutron star RX J185635-3754. It is the closest known neutron star, at a distance of 62 pc. The projected proper motion of 85 km s-1 places the neutron star in the vicinity of the Upper Scorpius OB association, and in close proximity to the runaway O star ζ Oph, about 1.1 million years ago. I will discuss implications for the radius of the neutron star. The likely age of this neutron star yields a clean point on the cooling curve. On the assumption that RX J185635-3754 was the binary companion to ζ Oph, the kick velocity imparted at birth must have been about 200 km s-1. This research is supported by STScI.

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