Pré-Publication, Document De Travail Année : 2006

Evolution of the circumstellar disc of alpha Eri

Résumé

The Halpha line emission formation region in the circumstellar disc of alpha Eri is: a) extended with a steep outward matter density decline during low H$\alpha$ emission phases; b) less extended with rather constant density distribution during the strong Halpha emission. The long-term variation of the Halpha emission has a 14-15 year cyclic B-Be phase transition. The disc formation time scales agree with the viscous decretion model. The time required for the disc dissipation is longer than expected from the viscous disc model.

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Dates et versions

hal-00016427 , version 1 (04-01-2006)

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M.M.F. Vinicius, N.V. Leister, J. Zorec, R.S. Levenhagen. Evolution of the circumstellar disc of alpha Eri. 2006. ⟨hal-00016427⟩
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