An optical candidate for 2A 0042+323 /= 3U 0042+32/

Details An optical candidate for 2A 0042+323 /= 3U 0042+32/ An optical candidate for 2A 0042+323 /= 3U 0042+32/

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183p..29c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 183, May 1978, p. 29P-33P.

Other

6

Stellar Luminosity, Stellar Spectrophotometry, Variable Stars, X Ray Sources, X Ray Stars, Galactic Radiation, Halos, Interstellar Extinction, Light Emission, Main Sequence Stars, Star Distribution

Scientific paper

Spectrophotometric observations have been obtained of all stars brighter than 20 mag in the 1-arcmin-radius SAS3 error circle for the high-latitude X-ray source 2A 0042+323 and most of the stars brighter than 18 mag within 2 arcmin of the SAS3 best position. None of these stars seemed unusual except one star (V about 19.2 mag) within the error circle, which displayed weak He II 4686-A emission on one occasion and was not visible some months later, thus making this star a prime candidate for the X-ray source. In addition, there is evidence for this star being variable. Details of this star are provided, and spectral types are given for the other stars observed. The implications of this candidature are discussed in the context of the recently observed X-ray variability.

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