Luminosity effects in the ultraviolet spectrum of B5-B6 stars

Details Luminosity effects in the ultraviolet spectrum of B5-B6 stars Luminosity effects in the ultraviolet spectrum of B5-B6 stars

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..156u&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 156-162.

Astronomy and Astrophysics

Astrophysics

B Stars, Stellar Atmospheres, Stellar Luminosity, Stellar Spectra, Ultraviolet Spectra, Absorption Spectra, Line Spectra, Spectrum Analysis, Thermodynamic Equilibrium

Scientific paper

Copernicus U2 spectral tracings of the ultraviolet spectra of Eta CMa (B5 Ia) and Zeta Dra (B6 III) have been compared, and four regions - 1330 to 1340 A, 1340 to 1350 A, 1390 to 1396 A, and 1398 to 1405 A - are found to contain differences due to luminosity effects. The observed profiles are interpreted using synthetic spectra predicted with LTE theory. These effects are found: (1) the C II 1335 blend is shortward-displaced in Eta CMa, (2) the P III and Si IV resonance lines strengthen significantly in the supergiant, and (3) lines of multiplet UV7 of Si II are strengthened by non-LTE effects in the supergiant.

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