Parallax Observations with the [ITAL]Hubble Space Telescope[/ITAL] Yield the Distance to Geminga
1996; IOP Publishing; Volume: 461; Issue: 2 Linguagem: Inglês
10.1086/310012
ISSN1538-4357
AutoresP. A. Caraveo, G. F. Bignami, R. Mignani, L. G. Taff,
Tópico(s)Astronomical Observations and Instrumentation
ResumoUsing data from Hubble Space Telescope observations, we report the first optical measurement of the annual parallax of a neutron star. This is the counterpart of the X-ray/γ-ray pulsar Geminga, for which strong proper motion has already been reported. Significant displacement from such motion is detected using WFPC2 observations, taken at the dates of the maximum predicted parallactic factor. The resulting distance value is 157 pc (+59, -34), just consistent with the lower end of the wide range derived from X-ray data.
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