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Spectral and Photometric Evolution of V725 Tau (1996-1999): Towards a Shell Phase?

Published online by Cambridge University Press:  12 April 2016

A. Piccioni ,
C. Bartolini ,
S. Bernabei ,
S. Galleti ,
F. Giovannelli ,
A. Guarnieri ,
L. Sabau-Graziati ,
G. Valentini  and
M. Villada
A. Piccioni
Affiliation:
Dipartimento di Astronomic, Universitá di Bologna, Italy
C. Bartolini
Affiliation:
Dipartimento di Astronomic, Universitá di Bologna, Italy
S. Bernabei
Affiliation:
Dipartimento di Astronomic, Universitá di Bologna, Italy
S. Galleti
Affiliation:
Dipartimento di Astronomic, Universitá di Bologna, Italy
F. Giovannelli
Affiliation:
Istituto di Astrofisica Spaziale, Frascati, Italy
A. Guarnieri
Affiliation:
Dipartimento di Astronomic, Universitá di Bologna, Italy
L. Sabau-Graziati
Affiliation:
I.N.T.A., Madrid, Spain
G. Valentini
Affiliation:
Osservatorio di Collurania, Teramo, Italy
M. Villada
Affiliation:
C.A.S.L.E.O., Argentina

Abstract

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HDE 245770 = V725 Tau, the optical counterpart of A0535+26, presented in the last three years a period of uncommon optical faintness and of exceptionally low spectral activity. Photometric data obtained in 1997 and 1998 show a fading in all color, followed in 1999 by a nearly constant phase in which the star attained the lowest level of the last 23 years. In 1998 the emission lines became much fainter than in 1997, changing slowly from emission to absorption. In November 1998 only Hα was still showing a weak emission with an absorption core; this behaviour suggests the occurrence of a shell phase.

Type
6. Disks
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 569 - 572
Copyright
Copyright © Astronomical Society of the Pacific 2000

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