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Revisiting ϵ Eridani with NEID: Identifying New Activity-sensitive Lines in a Young K Dwarf Star

  • Authors: Sarah Jiang, Arpita Roy, Samuel Halverson, Chad F. Bender, Carlos Selgas, O. Justin Otor, Suvrath Mahadevan, Guđmundur Stefánsson, Ryan C. Terrien, Christian Schwab

Sarah Jiang et al 2024 The Astronomical Journal 167 .

  • Provider: AAS Journals

Caption: Figure 3.

Results of our analysis of the Wise line list using our partially automated method and NEID ϵ Eri spectra. In these graphs, the ∣τ∣ and ∣ρ∣ values are for the correlation between line core flux/depth and S-index. (a) ∣τ∣ values for each line in the Wise line list calculated by Wise et al. (2018; “W18”) plotted against the ∣τ∣ values we calculated for the same lines using NEID data of ϵ Eri. The 1:1 line is marked in blue, and our threshold for correlation in ∣τ∣ is marked in gray. Five lines did not meet our threshold for correlation in ∣τ∣. (b) Both our and W18's ∣τ∣ values for each line in the Wise line list, organized by wavelength. Our threshold for correlation in ∣τ∣ is marked in gray. (c) Both our and W18's ∣τ∣ values and our ∣ρ∣ values (W18 did not calculate ∣ρ∣) for each line in the Wise line list, organized by line number in descending order of ∣τ∣ values calculated by W18, and the corresponding histograms. Our thresholds for correlation in ∣τ∣ and ∣ρ∣ respectively are marked in gray. In addition to the lines that did not meet our threshold for correlation in ∣τ∣, one line was found to meet our threshold for correlation in ∣τ∣, but not ∣ρ∣. The corresponding histograms show the ∣τ∣ and ∣ρ∣ values we calculated for correlations between line depth and S-index for the Wise line list. ∣ρ∣ values are consistently higher than corresponding ∣τ∣ values for the same line.

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