THE LONG-TERM H$\alpha$ EMISSION LINE VARIATION IN $\alpha$~Eri

M.M.F. Vinicius (1) , Nelson, Vani Leister (1) , Juan Zorec (2) , Ronaldo Levenhagen (1)

1 IAG - Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo]
2 IAP - Institut d'Astrophysique de Paris

The long-term variation of the H$\alpha$ line in $\alpha$~Eri has 14-15 years cyclic \bbe phase transitions. The disc formation time scales, interpreted as the periods during which the H$\alpha$ line emission increases from zero to its maximum, agree with the viscous decretion model. On the other hand, the time required for the disc dissipation ranges from 6 to 12 years which questions the viscous disc model predictions.

Mots clés: Line emission; Be stars; alpha Eri

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

M.M.F. Vinicius, Nelson, Vani Leister, Juan Zorec, Ronaldo Levenhagen. THE LONG-TERM H$\alpha$ EMISSION LINE VARIATION IN $\alpha$~Eri. 2005. ⟨hal-00008531⟩