Comparative Study of Low-temperature Opacities with GARSTEC Models

Author:

Reeve Pedro DíazORCID,Serenelli AldoORCID

Abstract

Abstract We present a comparative study of the effect of low-temperature opacities on stellar models up to the Red Giant branch (RGB), computed with the GARching STellar Evolution Code. We have used two sets of low-temperature opacities; ÆSOPUS (Æ) from the University of Padova and those from the Wichita State University group (F05). In the relevant range of temperatures for this study, log κ Æ < log κ F 05 . Therefore, to compare stellar evolutionary tracks, we performed a solar calibration of the α mlt, for each set of low-temperature opacities. After carrying such a calibration, we find that stellar evolutionary tracks are almost unaffected by the choice of low-temperature opacities, with largest variations of 25–30 K at the latest evolutionary stages of the RGB phase.

Publisher

American Astronomical Society

Subject

General Medicine

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