The optical counterparts of SMC X-2 and SMC X-3

Details The optical counterparts of SMC X-2 and SMC X-3 The optical counterparts of SMC X-2 and SMC X-3

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l..79c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, July 15, 1978, p. L79-L81.

Other

19

Luminous Intensity, Stellar Spectra, X Ray Sources, X Ray Stars, Emission Spectra, H Lines, Helium Ions, Magellanic Clouds, Radial Velocity

Scientific paper

The spectra of the Sanduleak-Philip optical candidates of SMC X-2 and SMC X-3 are remarkably similar to each other and to the optical X-ray counterparts X Per, Gamma Cas, and HDE 245770. Although it is probable that they are the optical counterparts of SMC X-2 and X-3, their variable X-ray luminosity, when detected, was considerably higher than that of optically similar variable sources in the Galaxy. He II 4686-A emission is present, although very weak, in both spectra and appears to have large velocity and intensity changes on a time scale of days.

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