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The Onset of Chromospheres in A-type Stars: The Altair Affair

Published online by Cambridge University Press:  12 April 2016

S. Catalano ,
P. Gouttebroze ,
E. Marilli  and
R. Freire Ferrero
S. Catalano
Affiliation:
Istituto di Astronomia, Università di Catania, Viale A. Doria 6, I-95125 Catania, Italy
P. Gouttebroze
Affiliation:
Institut d’Astrophysique Spatiale, IAS/LPSP CNRS, BP N˚ 10, 91371 Verrieres-le Buisson, France
E. Marilli
Affiliation:
Osservatorio Astrofisico di Catania, Viale A. Doria 6, I-95125 Catania, Italy
R. Freire Ferrero
Affiliation:
Institut d’Astrophysique Spatiale, IAS/LPSP CNRS, BP N˚ 10, 91371 Verrieres-le Buisson, France Observatorie Astronomique, 11, Rue de l’Université, 67000 Strasbourg, France

Abstract

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Here we present preliminary results on the study of the chromosphere of Altair from Lα high dispersion profiles. We report also the detection of Lα chromospheric emission from α Cep (A7V) and β TrA (F0 V) with the IUE. We show that chromosphere may exist up to B – V = 0.22. The possible heating mechanism, magnetic or nonmagnetic, for the chromosphere of these stars is also discussed.

Type
Part IV Stellar activity
Information
International Astronomical Union Colloquium , Volume 130: The Sun and Cool Stars: activity, magnetism, dynamos , 1991 , pp. 446 - 470
Copyright
Copyright © Springer-Verlag 1991

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