Abstract
Evolutionary tracks of 0.9M ⊙, 0.7M ⊙ and 0.6M ⊙ models for Population II stars have been computed in the post-red giant phase. The stars are initially composed of a helium core containing a mass fraction equal to 0.9 and of a hydrogen-rich envelope. They represent hypothetical remnants of stars after substantial mass loss in previous evolutionary phases or/and at the helium flash.
Со∂ерисанuе
В работе рассчитаны эволюционные пути сдедуюшие за σтадией красных иγантов для моделей звёзд с массами 0,9M ⊙, 0,7M ⊙ и 0,6M ⊙ населения П типа. Исходние модели состгят из гелиевого ядра, содержащего 90% общей массы, и водородной ободочки. Их можно считать ‘остатками’ звезд, потерявших в акте предшествующей эволюции существенную частъ общей массы.
Riassunto
È stata calcolata per modelli di stelle di 0,9M ⊙, 0,7M ⊙ e 0,6M ⊙ di Popolazione II l'evoluzione successiva allo stadio di gigante rossa. Inizialmente i modelli constano di un nucleo di elio contenente il 90% della massa totale e di un inviluppo idrogenico. Essi possono interpretarsi come i ‘resti’ di stelle che abbiano perso una frazione di massa considerevole in fasi evolutive precedenti, o all'innesco violento dell'elio al centro.
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Castellani, V., Giannone, P. & Renzini, A. Horizontal-branch star models. Astrophys Space Sci 4, 103–118 (1969). https://doi.org/10.1007/BF00651265
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DOI: https://doi.org/10.1007/BF00651265