Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..204e&link_type=abstract
Astrophysical Journal, Vol.243, P. 204, 1981
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
Observations of lines of C III in a sample of O- and B-type stars have been obtained with modern Reticon detectors. The multiplet λλ9701-9718 is in emission in all stars with spectral types earlier than 08. The latest spectral type at which emission is seen in supergiants is B0, while the feature is in absorption in the 09.5 V star σ Ori. The variation of equivalent width with spectral type and luminosity class matches closely the behavior previously observed for C III λ5696. In the O stars with λ5696 in emission, the profile of that line is narrow and symmetric, with no trace of broad emission wings. Tile 8500 line is always observed to be in absorption, regardless of the behavior of λλ9701-9718 or 5696. The observations support model calculations which show that the emission at λλ9701-9718 and λ5696 can be produced in static stars in radiative equilibrium.
Ebbets Dennis
Wolff Sidney C.
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