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“Normal” LBV eruptions à la S Doradus

Published online by Cambridge University Press:  12 April 2016

B. Wolf
B. Wolf*
Affiliation:
Landessterwarte Königstuhl D-6900 Heidelberg 1

Abstract

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The main characteristics of the LBVs with “normal” S Dor-type outbursts are reviewed. At quiescence they are luminous (MBol ≈ −9 to −10) OB supergiants (14 000 K ≲ Teff ≲ 30 000 K) occupying an inclined instability strip in the HRD. The most luminous S Dor variables are the hottest ones. During outburst dense envelopes are expelled of equivalent spectral type middle A to early F. S Dor variables occupy at maximum a vertical strip in the HRD at T≈8000 K. The observed amplitudes in the visual range increase from 1 mag (e.g. R71; Teff = 14500 K at quiescence) to 2.5 mag (e.g. R127; Teff = 33000 K at quiescence). The existence of an amplitude-luminosity relation is suggested which can be used to derive extragalactic distances.

Type
Section I: Main Papers, General Discussions, and Two Panel Discussions
Information
International Astronomical Union Colloquium , Volume 113: Physics of Luminous Blue Variables , 1989 , pp. 91 - 100
Copyright
Copyright © Kluwer 1989

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