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SPECTRAL PROPERTIES OF COOL STARS: EXTENDED ABUNDANCE ANALYSIS OF 1,617 PLANET-SEARCH STARS

  • Authors: John M. Brewer, Debra A. Fischer, Jeff A. Valenti, and Nikolai Piskunov

2016 The Astrophysical Journal Supplement Series 225 32.

  • Provider: AAS Journals

Caption: Figure 12.

The bulk of the comparison stars are from the SPOCS catalog (VF05), which uses an analysis technique very similar to ours, but that was shown to have problems recovering accurate gravities for hotter and lower-gravity stars (Torres et al. 2012; Brewer et al. 2015). At gravities below solar, we obtain consistently lower log g, especially with respect to the SPOCS stars. The rms scatter in ﹩{\rm{\Delta }}\mathrm{log}g﹩ of 0.12 dex about the fitted offset of −0.007 dex (blue dashed line) is more than double the scatter for our comparison with asteroseismically determined gravities. An offset was preferred over a sloping fit by both AIC and BIC tests.

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