High-resolution rocket spectra of the 1920-A and 1720-A features in the spectrum of Zeta Tauri

Astronomy and Astrophysics – Astronomy

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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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