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High-resolution spectroscopy of two LBV cycles of HR Car

Published online by Cambridge University Press:  26 May 2016

Thomas Szeifert ,
Andreas Kaufer ,
Paul A. Crowther ,
Otmar Stahl  and
Chris Sterken
Thomas Szeifert
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile
Andreas Kaufer
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile
Paul A. Crowther
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Otmar Stahl
Affiliation:
Landessternwarte Königstuhl, D-69117 Heidelberg, BRD
Chris Sterken
Affiliation:
Astrofysisch Instituut, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussel, België

Abstract

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Luminous Blue Variables (LBVs or S Dor Variables) are showing characteristic variability of very long timescales of a decade and more. During their expansion and contraction phases, they move across a wide part of the H-R diagram with dramatic changes of their stellar wind characteristics, radius and temperature. We present results of our long-term spectroscopic monitoring campaigns for the galactic star HR Car with optical spectra taken over 13 years and two minimum and maximum phases observed during this time.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 243 - 244
Copyright
Copyright © Astronomical Society of the Pacific 2003