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Title:
The development of the red giant branch. II - Astrophysical properties
Authors:
Sweigart, Allen V.; Greggio, Laura; Renzini, Alvio
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(Bologna, Università, Italy), AC(Bologna, Università, Italy)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. 527-539. (ApJ Homepage)
Publication Date:
12/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Globular Clusters, Late Stars, Magellanic Clouds, Red Giant Stars, Stellar Evolution, Stellar Interiors, Helium, Stellar Luminosity, Stellar Mass Ejection, Stellar Structure
DOI:
10.1086/169434
Bibliographic Code:
1990ApJ...364..527S

Abstract

Evolutionary sequences developed in another paper are used here to investigate the properties of the red giant branch (RGB) phase transition. Results are found for compositions in the range Y(MS) between 0.20 and 0.30 and Z between 0.004 and 0.04. The transition mass M(HeF) increases as either Y(MS) decreases or Z increases. The stellar population transition age t(HeF) is virtually independent of composition and close to 0.6 Gyr. The RGB phase transition occurs almost abruptly over a mass range of only a few tenths of a solar mass or, equivalently, over a time interval of about 0.2 Gyr in the life of a stellar population. During the RGB phase transition the core mass Mc at helium ignition increases very rapidly by about 0.15 solar mass, while the luminosity at the tip of the RGB increases by about one order of magnitude. Absolute minima are found for the values of Mc and the RGB tip luminosity.

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