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More missing stellar opacity? (1994)

Chin, Chao-Wen ; Stothers, Richard B.

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Publication Date: 2011-08-24

Description: 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 10(exp 6) K. Indeed, no other suggested remedy seems to yield a blue loop at the lowest observed loop luminosities.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 421; 2; p. L91-L93

Format: text

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