Semiconvection in Low-Mass Main Sequence Stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

7

Scientific paper

The presence of semiconvection has been found in low- mass main sequence stellar models. The development of a growing semiconvective zone is associated with an expanding convective core. Using spline-interpolated opacities and a dynamic treatment of semiconvection, the calculations indicate that the low-mass limit to the presence of a convective core and an associated semiconvective zone is M/Msun ≃ 1.2 for (X, Z) = (0.71, 0.02). Semiconvection increases the height of the gap in the colour-magnitude diagram above the zero-age main sequence as required for agreement with observations of old open clusters. However semiconvection also increases the colour width of the gap, making the discrepancy between observations and theory worse. Convective overshooting may be the main mechanism responsible for these discrepancies between time-lines and open cluster sequences over a wide range of ages (Maeder, 1975, 1976; Maeder and Mermilliod, 1981). Our results indicate that semiconvection should also be taken into account before comparison is made between the theoretical isochrones and the colour-magnitude diagrams of those open clusters older than the Hyades.

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

Semiconvection in Low-Mass 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 Semiconvection in Low-Mass Main Sequence Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconvection in Low-Mass Main Sequence Stars will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-839956

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