Ultraviolet spectral morphology of the O stars. IV - The OB supergiant sequence

Details Ultraviolet spectral morphology of the O stars. IV - The OB supergiant sequence Ultraviolet spectral morphology of the O stars. IV - The OB supergiant sequence

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99...40w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Jan. 1987, p. 40-53.

Other

40

B Stars, O Stars, Spectral Energy Distribution, Supergiant Stars, Ultraviolet Spectra, Abundance, Ionization Potentials, Stellar Winds, Visible Spectrum

Scientific paper

An atlas of 25 O3 - B8 supergiant spectra in the wavelength ranges 1320 Å - 1580 Å and 1620 Å - 1880 Å is presented, based on high-resolution data from the International Ultraviolet Explorer archives. This remarkably detailed relationship between the stellar-wind profiles and the optical spectral classifications throughout this sequence is emphasized. For instance, the Si IV/C IV ratio reverses between O4 and O6.5; and the B0, B0.5, and B0.7 Ia wind characteristics are each qualitatively unique and distinct from one another. The systematic behaviour of nine stellar-wind features with ionization potentials ranging from 114 to 19 eV is summarized as a function of advancing spectral type.

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