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A GRANULATION “FLICKER”-BASED MEASURE OF STELLAR SURFACE GRAVITY

  • Authors: Fabienne A. Bastien, Keivan G. Stassun, Gibor Basri, and Joshua Pepper

2016 The Astrophysical Journal 818 43.

  • Provider: AAS Journals

Caption: Figure 4.

Red clump stars and red giant branch (RGB) stars have different ﹩\mathrm{log}\;g﹩ values but similar F8: red clump stars (cyan and magenta points) cleanly separate from red giant stars (red points) in the F8–asteroseismic ﹩\mathrm{log}\;g﹩ diagram, with clump stars having somewhat lower ﹩\mathrm{log}\;g﹩. Both populations, however, tend to have similar F8 values, suggesting similar contributions to the F8 signal from convective motions despite different evolutionary states. Clump and secondary clump stars also tend to separate, with the lower-mass clump stars tending to have lower ﹩\mathrm{log}\;g﹩ but larger F8. Black points represent stars whose evolutionary state is unknown (see Stello et al. 2013); many of these lie on the red clump sequence of the F8–﹩\mathrm{log}\;g﹩ diagram, suggesting that F8 might be used as a constraint in addition to the asteroseismic analysis to help elucidate their nature.

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