Compilation of Spectral Line Diagnostics
for Benchmark Sample

Left: A compilation of 10 K dwarf (B p − R p between 1.2 and 1.5) spectra from all 5 benchmark age groups, focusing on a 15 Å window around the Na I Doublet at at 5889.95 Å & 5895.92 Å. Middle: A compilation of 10 K dwarf (B p − R p between 1.2 and 1.5) spectra from all 5 benchmark age groups, focusing on a 10 Å window around the Hα 6563 Å line. Right: A compilation of 10 K dwarf (B p − R p between 1.2 and 1.5) spectra from all 5 benchmark age groups, focusing on a 15 Å window around the Li I 6707.7 Å feature. Benchmark groups included in plots: β Pic (blue), Tuc-Hor (green), AB Dor (red), Hyades cluster (black), K field dwarfs (yellow). Stars included: (a) CD-26 13904, (b) AO Men, (c) BD-15 705, (d) CD-78 24, (e) HD 201919, (f) BD+20 1790, (g) HD 285828, (h) HD 285507, (i) GJ0250A, and (j) eps Ind. Spectral types taken from the Simbad database.

Takeaways:

The Li I 6707.7 line decreases with the increasing age of moving associations.
The Hα 6563 Å core emission decreases with the increasing age of moving associations.

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Equivalent Width Trends for
Benchmark and Variable RV K dwarfs

(a) Plot showing EW[Na I Doublet] vs. Gaia Bp − Rp for variable RV main sample members (n=7)and benchmark members (n=36).(b) Plot showing EW[Hα] vs. Gaia Bp − Rp for variable RV main sample members (n=7) and benchmark members (n=36).(c) Plot showing EW[Li I] vs. Gaia Bp − Rp for variable RV main sample members (n=7) and benchmark members (n=36).(d) Plot showing EW[Hα] vs. EW[Li I] for variable RV main sample members (n=7) and benchmark members (n=36). Dashed black box in the bottom left highlights K dwarfs present in the old locus. Numbered stars: (1) DX Leo, (2) V834 Tau, (3) DG Cap, (4) HIP 90035, (5) HIP 59000, (6) HIP 62942, and (7) HIP 57058

Takeaways:

(1) DX Leo & (2) V834 Tau shows Li I youth marker.
(3) DG Cap, (4) HIP 90035, & (5) HIP 59000, are flagged as active using Hα.

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