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Paper: On the Mass and Evolutionary Status of the Bright Red AGB Supergiant α1 Herculis
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 163
Authors: Moravveji, E.; Guinan, E. F.; Sobouti, Y.
Abstract: The mass of the bright M5 supergiant α1 Herculis has been estimated in a number of studies to range over wide limits of 1.7 to 15 M. Here, we address this wide range of mass assessments by constraining the age, mass and nature of this interesting variable star from three independent approaches: (1) isochronal fitting of the three stars in the α Her multiple star system, (2) extending asteroseismic mass and radius scaling to semi-regular variable stars like α1 Her, and (3) directly from assessments of log g and interferometric radius measures. Our study indicates that α1 Her is an intermediate-mass AGB star with a mass of ∼2.5 M and age of ∼1.2 Gyr.
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