Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217...90h&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Oct. 1, 1977, p. 90-94.
Astronomy and Astrophysics
Astronomy
4
B Stars, Shell Stars, Stellar Atmospheres, Stellar Spectra, Supergiant Stars, Ultraviolet Spectra, Absorption Spectra, Aerobee Rocket Vehicle, Aluminum, Iron, Line Spectra, Nickel, Spectral Resolution, Ultraviolet Astronomy
Scientific paper
High-resolution ultraviolet spectrograms of the B-shell star Zeta Tau reveal two features characteristic of B supergiants, one at 1720 A and the other at 1920 A. The presence of these features in the spectrum of this object shows that they are indicative of an extended atmosphere - either the tenuous atmosphere of a supergiant or the envelope surrounding a rapidly rotating main-sequence star - and are therefore not purely luminosity criteria. The high spectral resolution allows an identification of the contributors to these features. The dominant contributor to the 1920-A feature is Fe III, while the primary contributor to the 1720-A feature is Al II.
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