“Normal” LBV Eruptions A La S Doradus

Part of the Astrophysics and Space Science Library book series (ASSL, volume 157)

Abstract

The main characteristics of the LBVs with “normal” S Dor-type outbursts are reviewed. At quiescence they are luminous (M Bol ≈ -9 to -10) OB supergiants (14 000 K ≲ T eff ≲ 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; T eff = 14500 K at quiescence) to 2.5 mag (e.g. R127; T eff = 33000 K at quiescence). The existence of an amplitude-luminosity relation is suggested which can be used to derive extragalactic distances.

Keywords

Light Curve Bolometric Luminosity Instability Strip Rayet Star Absolute Luminosity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • B. Wolf
    • 1
  1. 1.Landessternwarte KönigstuhlHeidelberg 1Germany

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