Other
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..674k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 674-682.
Other
71
Globular Clusters, Stellar Evolution, Stellar Luminosity, Subgiant Stars, Color-Magnitude Diagram, Opacity, Oxygen, Stellar Magnitude, Stellar Rotation
Scientific paper
Photographic photometry has been obtained for 1200 stars in the magnitude range of V = 13.5 to 17.5 in the field of the Galactic globular cluster 47 Tucanae and used to form both a color-magnitude diagram and a luminosity function. No gap at the base of the giant branch of size similar to those recently reported in other clusters was detected, but a prominent peak is present in the luminosity function at a level approximately 0.5 mag below the horizontal branch. This peak is identified with that which results from the passage of the hydrogen-burning shell through the composition discontinuity left by the deepest penetration of the convective envelope of the star. However, the observed peak is nearly 1 mag fainter than the prediction of standard stellar evolution theory for the age and composition of this cluster. The most plausible explanation for this discrepancy is that it results from overshoot at the base of the convective envelope of the stars. An overshoot of approximately one local pressure scale height is sufficient to produce agreement with the observations.
Da Costa Gary S.
Demarque Pierre
King Ronald C.
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