Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sgyu.conf..113w&link_type=abstract
Studies of Galaxies in the Young Universe with New Generation Telescope, Proceedings of Japan-German Seminar, held in Sendai, Ja
Physics
Scientific paper
The structure and evolution of galaxies is noticeably influenced by the energy input of very massive stars. They are not only the supply of heavier elements, they also influence the distribution and structure of the interstellar medium through their strong stellar winds and supernova explosions. Losing more than 50% of their ZAMS-mass during their life, stars more massive than ~ 50 M&sun; substantially contribute to the mass and energy input which can drive large scale outflows from galaxies. In this presentation I will mainly concentrate on a short but violent phase of mass loss of the most massive stars, known as Luminous Blue Variables. In only a few thousand years a large amount of mass is released (in some cases several solar masses), forming a nebula around the LBV. Besides of a general overview of the LBVs special concern will be given to the nebula around eta Carinae for which new results from CHANDRA observations show the shocks emitting in the X-ray band. Finally I will briefly address the question of the role of LBV type stars in the early phase of galaxy formation and in connection with the first stars formed.
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