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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 7.

The left column shows uncorrected solar relative abundances ([ϵ/H]) for the subset of dwarf stars in our sample with S/N ≥ 100 and ﹩v\sin i﹩ ≤ 3 km s−1. The right column shows stars with ﹩3\lt \mathrm{log}g\lt 4﹩ and the same S/N and ﹩v\sin i﹩ cuts. The black dashed line is a Gaussian kernel regression fit to the points and their uncertainties between the vertical dotted lines. The colored points show binary pairs in our sample, and their slopes roughly follow the trend line. Between 6300 and 5300 K, most elements show no significant trends in abundance with respect to ﹩{T}_{\mathrm{eff}}﹩. A notable exception is nitrogen, which shows a very strong correlation over the entire temperature range. There were too few points to adequately fit the lower-gravity stars, but they generally show the same trends as the dwarfs.

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