Ultraviolet and visual wavelength spectra were obtained of two peculiar emission objects, Henize S63 and Sanduleak.'s star in the Large Magellanic Cloud. Previously not observed in the near- or far-ultraviolet, both objects exhibit strong permitted and semiforbidden line emission. Estimates based on the absolute continuum flux of the hot companion star in Hen S63 indicate that it rivals the luminosity of the carbon star primary. The emission-line profile structure in both objects does not suggest Wolf-Rayet type emission. Carbon in Sanduleak.'s star (LMC anonymous) is conspicuously absent, while N v, N IV], and N III] dominate the UV emission-line spectrum. Nitrogen is overabundant with respect to carbon and oxygen in both objects. The large overabundance of nitrogen in Sanduleak.'s star suggests evidence for CNO processed material similar to that seen in 'II Car.
Kafatos, M., Michalitsianos, A.G. Allen, D.A., Stencel, R.E. (1983). Observations of two peculiar emission objects in the Large Magellanic Cloud, The Astrophysical Journal, 275: 584-591. doi: 10.1086/161557