Copernicus observations of the N V resonance doublet in 53 early-type stars

Details Copernicus observations of the N V resonance doublet in 53 early-type stars Copernicus observations of the N V resonance doublet in 53 early-type stars

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...48..369a&link_type=abstract

Astrophysical Journal Supplement Series, vol. 48, Mar. 1982, p. 369-393.

Astronomy and Astrophysics

Astrophysics

34

Early Stars, Nitrogen Ions, Resonance Lines, Stellar Evolution, Stellar Spectra, Stellar Winds, Ultraviolet Spectra, B Stars, Hertzsprung-Russell Diagram, Main Sequence Stars, O Stars, Stellar Envelopes, Stellar Luminosity, Stellar Temperature, Wolf-Rayet Stars

Scientific paper

UV spectra in the wavelength interval 1170-1270 A are presented for 53 early-type stars ranging in spectral type from O6.5 V to B2.5 IV. The sample includes four Wolf-Rayet stars, seven known Oe-Be stars, and six galactic halo OB stars. A qualitative analysis of the stellar N v doublet reveals that: (1) N v is present in all stars hotter and more luminous than type B0 for the main sequence, B1 for giants, and B2 for supergiants; (2) shell components of N v and an unidentified absorption feature at 1230 A are present in about half of the stars; (3) the column density of N v is well correlated with bolometric luminosity over the spectral range O6 to B2; and (4) the ratio of emission to absorption equivalent width is a factor of 2 smaller in the main sequence stars than in supergiants, which suggests that the wind structure changes as a star evolves. For several stars, this ratio is too small to be explained by traditional wind models.

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