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Binarity as the Solution to the Stellar Evolution Enigma Posed by NGC 6791

• Authors: Giovanni Carraro, and Omar G. Benvenuto

2017 The Astrophysical Journal Letters 841 L10.

• Provider: AAS Journals

Caption: Figure 1.

Evolutionary tracks for the initial 1.3 M model up to the moment at which it has a helium core with 0.4067 M. Since then, it is assumed that the object undergoes a CE episode. If the star emerges from the CE with a radius of 7.5 (1) R, it has a mass of 0.41344 (0.40973) M and follows the tracks depicted with the black (red) solid line. The blue points are bona fide NGC 6791 members (see Buzzoni et al. 2012), and blue squares represent the EHB stars.