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arXiv:astro-ph/0009031 (astro-ph)
[Submitted on 2 Sep 2000 (v1), last revised 13 Nov 2000 (this version, v2)]

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

Authors:Frederick M. Walter
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Abstract: The isolated neutron star RX J185635-3754 is the closest known neutron star to the Sun. Based on HST WFPC2 obervations over a 3 year baseline, I report its proper motion (332 +/- 1 mas/yr at a position angle of 100.3 +/- 0.1 degrees) and parallax (16.5 +/- 2.3 mas; 61 pc). This proper motion brings the neutron star from the general vicinity of the Sco-Cen OB association. For an assumed neutron star radial velocity between -55 and -60 km/s, the runaway O star zeta Oph, the Upper Sco OB association, and the neutron star come into spatial coincidence between 0.9 and 1.0 million years ago. RX J185635-3754 may be the remnant of the original primary of the zeta Oph system. If so, the space velocity suggests that the neutron star received a kick of about 200 km/s at birth.
Comments: Accepted by ApJ. Minor corrections to magnitude of space motions
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0009031
  (or arXiv:astro-ph/0009031v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0009031
Related DOI: https://doi.org/10.1086/319058

Submission history

From: Fred Walter [view email]
[v1] Sat, 2 Sep 2000 18:42:22 UTC (119 KB)
[v2] Mon, 13 Nov 2000 20:18:41 UTC (119 KB)
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