Left: Hertzsprung–Russell (H-R) diagram absolute magnitude M_K(0) vs. (J−K)₀, both corrected for interstellar extinction. Plotted lines show predicted loci for 10 Gyr age solar metallicity stars (- - -) and 3 Gyr age metal-poor ([Fe/H] = −2.5) stars (-· ·-) from Dartmouth Stellar Evolution models (Dotter et al. 2008). Right: RPM diagram, same targets plotted. Horizontal lines separate main sequence and sub-giants, and giants and super-giants. Star numbers are from Table 1. The color coding denotes main-sequence stars (red), white dwarfs (blue), and super-giants (black).