Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-13
Astrophys.J. 587 (2003) 795-805
Astronomy and Astrophysics
Astrophysics
13 printed pages, 10 figures. ApJ, in press (April 20, 2003)
Scientific paper
10.1086/368261
In the two previous papers of this series, we have discussed the importance of t he $\mu$-gradients due to helium settling on rotation-induced mixing, first in a n approximate analytical way, second in a 2D numerical simulation. We have found that, for slowly rotating low mass stars, a process of ``creeping paralysis" in which the circulation and the diffusion are nearly frozen may take place below the convective zone. Here we apply this theory to the case of lithium and beryll ium in galactic clusters and specially the Hyades. We take into account the rota tional braking with rotation velocities adjusted to the present observations. We find that two different cells of meridional circulation appear on the hot side of the "lithium dip" and that the "creeping paralysis" process occurs, not dir ectly below the convective zone, but deeper inside the radiative zone, at the to p of the second cell. As a consequence, the two cells are disconnected, which ma y be the basic reason for the lithium increase with effective temperature on thi s side of the dip. On the cool side, there is just one cell of circulation and t he paralysis has not yet set down at the age of the Hyades; the same modelisatio n accounts nicely for the beryllium observations as well as for the lithium ones .
Theado Sylvie
Vauclair Sylvie
No associations
LandOfFree
On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: II- Application to light elements in population I main-sequence stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: II- Application to light elements in population I main-sequence stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: II- Application to light elements in population I main-sequence stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-323095