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

Abstract

view Abstract Citations (35) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Copernicus observations of the N V resonance doublet in 53 early-type stars. Abbott, D. C. ; Bohlin, R. C. ; Savage, B. D. Abstract 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. Publication: The Astrophysical Journal Supplement Series Pub Date: March 1982 DOI: 10.1086/190781 Bibcode: 1982ApJS...48..369A Keywords: 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; Astrophysics full text sources ADS | data products SIMBAD (83) MAST (2)