Physics – Nuclear Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8567w&link_type=abstract
HST Proposal ID #8567
Physics
Nuclear Physics
Hst Proposal Id #8567 Hot Stars
Scientific paper
Cycle 6 and 7 observations of the isolated neutron star RX J185635-3754 have revealed a motion of 0.8 arcsec in 2.5 years. This is a combination of the annual parallax and the proper motion. A third observation, planned for this fall, will formally yield sufficient information to solve for the parallax and proper motion independently. This first ever measurement of the distance of an isolated neutron star has important ramifications for astrophysics and for nuclear physics. The magnitude of the expected parallactic shift is less than one PC pixel, and must be measured against a far larger shift due to the proper motion. While this parallactic shift is in principle measurable for distance up to about 100 pc, these real data are subject to subtle instrumental effects which may skew the results. Given the scientific importance of obtaining an accurate distance, we request a fourth epoch observation to confirm the parallax.
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