Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108...55c&link_type=abstract
Astronomy and Astrophysics, Vol.108, P. 55, 1982
Astronomy and Astrophysics
Astrophysics
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.
Crowe Richard A.
Matalas R.
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