Limits on parallax and proper motion of an optical counterpart of Geminga

Details Limits on parallax and proper motion of an optical counterpart of Geminga Limits on parallax and proper motion of an optical counterpart of Geminga

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..109s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 109-114.

Astronomy and Astrophysics

Astronomy

10

Astrometry, Astronomical Photometry, G Stars, Gamma Ray Astronomy, Stellar Motions, Stellar Parallax, X Ray Sources, Charge Coupled Devices, Distance, Electronography, Ubv Spectra

Scientific paper

A sequence of several images of the recently proposed optical counterpart of the X-ray source 1E 0630+178, possibly associated with the bright γ-ray source Geminga, is presented and discussed. From these data covering 410 days, an upper limit of 0arcsec.1 on its parallax can be derived, which places the object definitely further than 10 pc from the solar system. No evidence of proper motion has been detected up to 0arcsec.2/yr, which again places it further than 10 pc for a tangential velocity of 10 km s-1 relatively to the Sun. UBV photometry is compatible with the object being a G star, without measurable long-term variability. Another possible identification involves a very faint (B ≅ 24.3) object.

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