Infrared observations of the black-hole candidate V861 Sco

Abstract

V861 Sco was found to be an eclipsing binary by Cousins and Lagerwey1 and its radial velocity curve has been determined by Walker2. The primary is a B01 star, and taking suitable values for its mass the radial velocity curve suggests the unidentified secondary has a mass in the range 5–12 M. Recently Polidan et al.3,4 showed that the system may be an X-ray source; it is therefore a black-hole candidate. We therefore thought that observations at other wavelengths would be of interest and we report here IR observations from 1.2 to 3.6 µm.

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References

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JAMESON, R., SHERRINGTON, M., KING, A. et al. Infrared observations of the black-hole candidate V861 Sco. Nature 278, 233–234 (1979). https://doi.org/10.1038/278233a0

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