HEAD 2000, November 2000
Session 33. Isolated Pulsars
Display, Thursday, November 9, 2000, 8:00am-6:00pm, Bora Bora Ballroom

[Previous] | [Session 33] | [Next]

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

F. M. Walter (SUNY Stony Brook)

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 \zeta~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 \zeta~Oph, the kick velocity imparted at birth must have been about 200~km~s-1.

This research is supported by STScI.

The author(s) of this abstract have provided an email address for comments about the abstract: fwalter@astro.sunysb.edu

[Previous] | [Session 33] | [Next]