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X Sources in δ Scuti Stars: an Ultraviolet Study of 71 Tau

Published online by Cambridge University Press:  15 February 2018

L.E. Pasinetti Fracassini ,
L. Pastori ,
F. De Nile ,
E. Poretti  and
E. Antonello
L.E. Pasinetti Fracassini
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Milano, Milano, Italy
L. Pastori
Affiliation:
Osservatorio Astronomico di Brera, Milano, Italy
F. De Nile
Affiliation:
Dipartimento di Fisica, Universitá degli Studi di Milano, Milano, Italy
E. Poretti
Affiliation:
Osservatorio Astronomico di Brera, Milano, Italy
E. Antonello
Affiliation:
Osservatorio Astronomico di Brera, Milano, Italy

Extract

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IUE observations of δ Scuti variables were planned to study the correlations between chromospheric activity and dynamics of pulsations, convection, rotation and to search for evidence of mass loss. So far we observed the following stars: ρ Pup, β Cas, o1 Eri, K2 Boo, τ Peg, 69 Tau, 71 Tau and τ Cyg. Results and discussions on our survey may be found in Pasinetti Fracassini et al. (1990) and Fracassini et al. (1991).

Ultraviolet spectroscopic data (6 LWP and 3 SWP spectra) of 71 Tau were obtained with IUE in the year 1990, spanning an interval of 5h35rn and covering about 1.5 cycles of the pulsation period. The period, derived from new photometric observations, is 4h32m with an cimplitude of 0m.028. This variable is the most intense X-ray source in the Hyades cluster according to the results of Einstein Observatory.

Type
Windows on the Instability Strip
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 396
Copyright
Copyright © Cambridge University Press 1993

References

Fracassini, M., Pasinetti Fracassini, L.E., Pastori, L., Teays, T.J., and Mariani, A.: 1991, Astronom.Astrophys. 243, 458.Google Scholar
Pasinetti Fracassini, L.E., Pastori, L., Schmidt, E.G., and Teays, T.J.: 1990, in “Confrontation between stellar pulsation and evolution”, eds. Cacciari, C., Clementini, G., Bologna May 28-31 1990, p.230.Google Scholar
Walter, F.M., Schrijver, C.J., and Boyd, W.: 1988, in “A Decade of UV Astronomy” with IUE, ESA SP-281, Vol.1, p.323.Google Scholar
Zolcinski, M.C.S., Anthiocos, S.K., Stern, R.A., and Walker, A.B.C.: 1982, Astrophys.J. 258, 177.Google Scholar