Effects of turbulent pumping on stellar activity cycles

Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Published in Astronomische Nachrichten; 11 pages, 8 figures

Scientific paper

Stellar magnetic activity of solar like stars is thought to be due to an internal dynamo. While the Sun has been the subject of intense research for refining dynamo models, observations of magnetic cyclic activity in solar type stars have become more and more available, opening a new path to understand the underlying physics behind stellar cycles. For instance, it is key to understand how stellar rotation rate influences magnetic cycle period $\Pcyc$. Recent numerical simulations of advection-dominated Babcock Leighton models have demonstrated that it is difficult to explain this observed trend given a) the strong influence of the cycle period to the meridional circulation amplitude and b) the fact that 3D models indicate that meridional flows become weaker as the rotation rate increases. In this paper, we introduce the turbulent pumping mechanism as another advective process capable also of transporting the magnetic fields. We found that this model is now able to reproduce the observations under the assumption that this effect increases as $\Omega^2$. The turbulent pumping becomes indeed another major player able to circumvent the meridional circulation. However, for high rotation rates ($\Omega \simeq 5 \Omega_\odot$), its effects dominate those of the meridional circulation, entering a new class of regime dominated by the advection of turbulent pumping and thus leading to a cyclic activity qualitatively different from that of the sun.

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

Effects of turbulent pumping on stellar activity cycles 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 Effects of turbulent pumping on stellar activity cycles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of turbulent pumping on stellar activity cycles will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-381525

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