A nitrogen rich OB supergiant in the Large Magellanic Cloud

Details A nitrogen rich OB supergiant in the Large Magellanic Cloud A nitrogen rich OB supergiant in the Large Magellanic Cloud

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasau...2..353h&link_type=abstract

(Astronomical Society of Australia, Annual General Meeting, 9th, Parkes, New South Wales, Australia, May 14-16, 1975.) Astronomi

Astronomy and Astrophysics

Astronomy

4

B Stars, Nitrogen, O Stars, Supergiant Stars, Atmospheric Composition, Magellanic Clouds, Stellar Atmospheres, Stellar Luminosity, Stellar Spectra, Stellar Spectrophotometry

Scientific paper

Data obtained by high-dispersion spectrography and four-color photometry are presented which show that the highly luminous OB supergiant HD 269896, located in the Large Magellanic Cloud, is a nitrogen-rich star. The absolute visual magnitude of this star is estimated to be -8.1, and its spectrum is shown to contain some very strong N III lines along with exceedingly weak carbon-oxygen blends. It is concluded that HD 269896 has a nitrogen-rich carbon-deficient atmosphere and fulfills all the criteria to be classified as a nitrogen-rich O supergiant of spectral type ON9.7 IaO. Some possible origins of the nitrogen-rich OB supergiants are briefly considered.

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