Observations of two peculiar emission objects in the Large Magellanic Cloud | Zendy

M. Kafatos | Zendy; A. G. Michalitsianos | Zendy; D. A. Allen | Zendy; R. E. Stencel | Zendy

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Observations of two peculiar emission objects in the Large Magellanic Cloud

Author(s) -

M. Kafatos,

A. G. Michalitsianos,

D. A. Allen,

R. E. Stencel

Publication year - 1983

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/161557

Subject(s) - physics , astrophysics , wolf–rayet star , large magellanic cloud , astronomy , emission spectrum , stars , spectral line , carbon star , luminosity , young stellar object , star formation , galaxy

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 emissions. 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, semiforbidden N IV, and semiforbidden 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 processes material similar to that seen in Nu Car.

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