Other
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421l..91s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 421, no. 2, p. L91-L93
Other
13
Galactic Clusters, Opacity, Stellar Evolution, Stellar Structure, Supergiant Stars, Scale Height, Stellar Luminosity, Stellar Mass
Scientific paper
Observational data for Population I stars have shown that blue loops on the Hertzsprung-Russell (H-R) diagram form for stellar masses as low as approximately 4 solar mass. However, current state-of-the-art stellar models, unlike the older ones that were based on smaller opacities, fail to loop out of the red-giant region during core helium burning for masses less than 7 solar mass. A possible explanation is that the currently used Livermore opacities need to be further increased, by at least 70%, at temperatures characteristic of the base of the outer convection zone, around 1 x 106 K. Indeed, no other suggested remedy seems to yield a blue loop at the lowest observed loop luminosities.
Chin Chao-Wen
Stothers Richard B.
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