Convection in stellar envelopes: a changing paradigm

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

17 pages, uses memsait.sty, 2 postscript figures. Review, to appear in Mem. Soc. Astron. It. Much of the numerical work quoted

Scientific paper

Progress in the theory of stellar convection over the past decade is reviewed. The similarities and differences between convection in stellar envelopes and laboratory convection at high Rayleigh numbers are discussed. Direct numerical simulation of the solar surface layers, with no other input than atomic physics, the equations of hydrodynamics and radiative transfer is now capable of reproducing the observed heat flux, convection velocities, granulation patterns and line profiles with remarkably accuracy. These results show that convection in stellar envelopes is an essentially non-local process, being driven by cooling at the surface. This differs distinctly from the traditional view of stellar convection in terms of local concepts such as cascades of eddies in a mean superadiabatic gradient. The consequences this has for our physical picture of processes in the convective envelope are illustrated with the problems of sunspot heat flux blocking, the eruption of magnetic flux from the base of the convection zone, and the Lithium depletion problem.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Convection in stellar envelopes: a changing paradigm 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 Convection in stellar envelopes: a changing paradigm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Convection in stellar envelopes: a changing paradigm will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-597614

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.