J. B. Hutchings, A. P. Cowley and D. Crampton, Dominion Astrophysical Observatory, report: "Cerro Tololo Interamerican Observatory spectra of the star lying within 5" of the Einstein High Resolution Imager x-ray position for this pulsar show that it is a reddened supergiant of spectral type ~ B3. The star is at position R.A. = 11h45m02s.3, Decl. = -61o40'33" (equinox 1950.0), and has V ~ 12 and B ~ 14. No He II 468.6-nm emission is seen. These quantities are consistent with the implied low Lx/Lopt value, the x-ray cut-off and the long binary period proposed by White et al. (1980, Ay.J. 239, 659). Further observations of this star are desirable."
International Astronomical Union Circular
- Pub Date:
- November 1980