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Дата изменения: Tue Mar 24 21:18:12 1998 Дата индексирования: Sat Dec 22 11:09:00 2007 Кодировка: Поисковые слова: http astrokuban.info astrokuban |
Primary Project: Post Main Sequence Evolution of Very Massive Stars
(> 40M
).
The transition between O stars and WR is regulated by the loss of a significant
fraction of mass: 1) mass loss properties of transition objects such as Luminous
Blue Variables and Ofpe/WN9 stars, with the objective of understanding the
evolutionary connections in the upper HR Diagram. 2) kinematical and chemical
properties of the circumstellar nebulae of ejected
material around these evolved massive objects to investigate the mass
loss history of the central star. This has proven to be a very
effective and new tool to gain insight in these late stages of
evolution . 3) working on a program of radio observations of LBV nebulae to
assess the amount of neutral material associated with the ionised gas, with the
objective of placing a quantitative estimate on the total mass lost. We will
obtain CO observations of these nebulae. 4) using hydrodynamical models coupled
to stellar evolution models to reproduce the observed nebular morphologies and
properties, and therefore reconstruct the mass loss phases.
(collaborators: Clampin, Leitherer, Livio, Marston, Pasquali, Schulte-Ladbeck,
Sirianni, Smith, White).