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http://hdl.handle.net/20.500.12386/24565
Title: | The red giant branch phase transition: Implications for the RGB luminosity function bump and detections of Li-rich red clump stars | Authors: | CASSISI, Santi Salaris, Maurizio PIETRINFERNI, Adriano |
Issue Date: | 2016 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 585 | First Page: | A124 | Abstract: | We performed a detailed study of the evolution of the luminosity of He-ignition stage and of the red giant branch bump luminosity during the red giant branch phase transition for various metallicities. To this purpose we calculated a grid of stellar models that sample the mass range of the transition with a fine mass step equal to 0.01 M<SUB>☉</SUB>. We find that for a stellar population with a given initial chemical composition, there is a critical age (of 1.1-1.2 Gyr) around which a decrease in age of just 20-30 million years causes a drastic drop in the red giant branch tip brightness. We also find a narrow age range (a few 10<SUP>7</SUP> yr) around the transition, characterized by the luminosity of the red giant branch bump being brighter than the luminosity of He ignition. We discuss a possible link between this occurrence and observations of Li-rich core He-burning stars. | URI: | http://hdl.handle.net/20.500.12386/24565 | URL: | https://www.aanda.org/articles/aa/abs/2016/01/aa27412-15/aa27412-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201527412 | Bibcode ADS: | 2016A&A...585A.124C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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