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

THE LONG-TERM H$alpha$ EMISSION LINE VARIATION IN $alpha$~Eri - Download this document for free, or read online. Document in PDF available to download.

1 IAGCAUSP - Instituto de Astronomia Geofisica e Ciacias Atmosfericas 2 IAP - Institut d-Astrophysique de Paris

Abstract : 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.

Keywords : Line emission Be stars alpha Eri

Author: M.M.F. Vinicius - Nelson, Vani Leister - Juan Zorec - Ronaldo Levenhagen -

Source: https://hal.archives-ouvertes.fr/