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Rapid Variation of Shell Line Parameters in ζ Tau

Published online by Cambridge University Press:  23 September 2016

M. Bossi ,
G. Guerrero  and
M. Scardia
M. Bossi
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-22055 Merate CO, Italy
G. Guerrero
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-22055 Merate CO, Italy
M. Scardia
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-22055 Merate CO, Italy

Extract

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ζTau is a Be star which probably showed already in 1973 rapid variations in Hα emission strength with time scales of a few minutes (Bahng, 1976). It represents, moreover, the primary of a well-known binary system with a period of 132.91 days (e.g., Hynek and Struve, 1942), and its shell displays long term instabilities with time scales of some years (Delplace and Chambon, 1976). The basis of the present work is a compact set of 82 grating photographic spectrograms obtained at Merate by means of the 137 cm reflector with an inverse dispersion of about 35 Å/mm between Jan 17 and Jan 24, 1983. Forty four of these spectra cover the range between ˜ 4000 and ˜ 5000 Å, the other ones being centered on Hα.

Type
IIA. The Underlying Stars: Observations
Information
International Astronomical Union Colloquium , Volume 92: Physics of Be Stars , August 1987 , pp. 99 - 100
Copyright
Copyright © Cambridge University Press 1987

References

Bahng, J. D. R.: 1976, “Be and Shell Stars”, Slettebak, A. ed., p. 41, Dordrecht: Reidel.CrossRefGoogle Scholar
Delplace, A. M., and Chambon, M. T.: “Be and Shell Stars”, Slettebak, A. ed., p. 79, Dordrecht: Reidel.Google Scholar
Hynek, J. A., and Struve, O.: 1942, Ap. J. 96, 425.Google Scholar
Vanicek, P.: Astrophys. Space Sci. 12, 10.CrossRefGoogle Scholar