Stellar Evolution with Hydrodynamic Ejection

Details Stellar Evolution with Hydrodynamic Ejection Stellar Evolution with Hydrodynamic Ejection

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..190y&link_type=abstract

The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand

Physics

5

Scientific paper

We describe an evolutionary scenario for supernova impostors. The stellar evolution code TYCHO, which includes wave-driven mixing and rotation, is used to produce a star unstable to η Car analogue eruptions. We discuss stellar conditions which lead to the eruption. Using preliminary 1-D hydrodynamic simulations to estimate the effects of an eruption, we produce a schematic evolutionary track. Models with more complete stellar physics are more centrally condensed and move into the unstable region of the HR diagram late in main sequence hydrogen burning. The stellar structure allows an eruption to eject several solar masses of material and drive the star blueward. Several cycles of Luminous Blue Variable (LBV) evolution of order 104 years duration occur before the hydrogen-rich envelope is completely ejected and the star begins to evolve as a Wolf-Rayet.

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