Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..101l&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 91, Feb.-Mar. 1979, p. 101-104. Research supported by the National Rese
Astronomy and Astrophysics
Astronomy
6
B Stars, Carbon, Helium, Line Spectra, O Stars, Optical Transition, Stellar Spectra, Absorption Spectra, Early Stars, Emission Spectra, Spectral Line Width, Stellar Luminosity
Scientific paper
The line profiles and equivalent widths of C III λ5696 and He II λ4686 have been measured for 13 northern OB stars. The C III N5696 line is found in absorption for four more stars, all of which are of spectral types later than ∼B0. A strong luminosity dependence of C III λ5696 emission suggests itself in two ways. First, the more luminous the star, the later is the spectral type at which the emission becomes evident. Second, the more luminous stars tend to inhibit stronger emission at a given spectral type. Both results support the theoretical investigation of Cardona-Nunez concerning the formation of C III λ5696. No line profile variability was observed.
Leparskas J. A. H.
Marlborough J. M.
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