First dredge up efficiency mass9/23/2023 ![]() ![]() Sugimoto, D., and Nomoto, K.: 1975, Publ. Renzini, A., and Voli, M.: 1980, preprint. Iben, I., and Truran, J.W.: 1978, Astrophys. Minimum core mass for dredge-up, M min c, as a function of the current stellar mass for models with metallicity Z 0.004, Z 0.008, and Z 0.019, corresponding to the indicated value of log T. This process is experimental and the keywords may be updated as the learning algorithm improves. These keywords were added by machine and not by the authors. The present results provide estimates of the core mass at the onset of dredge-up as a function of AGB mass and Z, as required for calculations such as those of Iben & Truran (1978) and Renzini and Voli (1980) which consider enhancement of stellar surface abundances during stellar evolution and subsequent heavy metal enrichment of the interstellar medium via stellar mass loss. A lower mass limit for single carbon stars is found for each Z value by a simple envelope integration technique. It was found that reducing the envelope metal abundance in an AGB star of given total mass lowered the luminosity at which carbon stars were formed by the dredge-up of carbon at the helium shell flash. ![]() Asymptotic giant branch (AGB) evolution, including helium shell flashing, has been studied in stars of low mass (M ≤ 3 M Ө) with envelope helium abundance Y = 0.3 and metal abundances Z = 0.001, 0.01 and 0.02. ![]()
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