Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91...90d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, Jan. 1986, p. 90-97.
Astronomy and Astrophysics
Astronomy
8
Dwarf Stars, Gamma Ray Astronomy, Stellar Spectrophotometry, X Ray Sources, Charge Coupled Devices, G Stars, H Alpha Line, Neutron Stars, Stellar Motions, Stellar Spectra
Scientific paper
The authors have observed the field of the X-ray source 1E 0630+178, proposed as a probable counterpart of the γ-ray source 2CG 195+04 (Geminga). Deep CCD images of the field show two very faint optical sources within the X-ray error circle, as well as the 21 mag star (hereafter referred to as the G candidate) proposed earlier as the possible optical counterpart. The G candidate does not have a proper motion greater than 0.15 arcsec yr-1. The spectrum of this object shows no strong emission or absorption features. The authors conclude that the G candidate is most probably a distant G dwarf or a nearby, cool white dwarf. They believe that one of the fainter objects within the X-ray circle is more likely to be the true counterpart of the X-ray source, and possibly of the γ-ray source as well. This result is consistent with the interpretation of Geminga as a nearby neutron star, if all the γ rays are generated by some nonthermal mechanism.
Djorgovski Stanislav
Kulkarni Sanjeev R.
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