The colours of G-double-prime, the proposed optical counterpart of Geminga

Details The colours of G-double-prime, the proposed optical counterpart of Geminga The colours of G-double-prime, the proposed optical counterpart of Geminga

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202l...1b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. L1-L4.

Astronomy and Astrophysics

Astronomy

41

Blue Stars, Gamma Ray Astronomy, Neutron Stars, Stellar Spectra, Cyclotron Radiation, Emission Spectra, Stellar Luminosity

Scientific paper

New observations are presented on Garcsec, the proposed optical counterpart of 1E 0630+178/Geminga. Data from ESO 3.6 telescope show the object to be significantly less blue (mb ≡ 26.5±0.5) than would have been expected by its measured g-r ≡ -0.3. While the great care exercised in the calibrations gives confidence in this very faint magnitude measurement, its comparison with other data would imply an inversion in the object's spectral slope, or a B - V ≥ 1. No simple spectrum can fit such colours, and the possibility is briefly explored of the V emission being due to proton cyclotron radiation in a magnetized neutron star.

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