Absolute ultraviolet spectrophotometry from the TD-1 satellite. VII - Ultraviolet variations of Zeta Tau

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Shell Stars, Spectrum Analysis, Stellar Envelopes, Stellar Spectrophotometry, Ultraviolet Spectra, Ultraviolet Spectrophotometers, Absorption Spectra, Graphs (Charts), Radial Velocity, Spectral Energy Distribution, Spectral Resolution, Td-1 Satellite

Scientific paper

Magnitude and color variations are observed in the S 2/68 UV spectra of Zeta Tau, whereas the depth of the absorption features appears to stay mainly constant. The spectral type deduced from the energy-distribution envelope and the depth of the absorption features at 1410, 1555, and 1615 A is earlier than that deduced from optical observations, in agreement with other UV observations. On the other hand, Zeta Tau shows a large UV defect, probably due to the absorbing shell.

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