My research time today was spent writing in my SDSS-V open-fiber proposal. Adrian Price-Whelan (Flatiron) got and selected the relevant ESA Gaia data, and we did experiments with boxelization of the color-magnitude diagram. We are finding that there are (to my surprise) many SDSS-II, SDSS-III, and SDSS-IV spectra of the stars in between the main sequence and the white dwarf sequence (home of CVs, stripped stars, and low-metallicity stars). Thousands! But to my equally large surprise, there are almost no optical spectra of the most luminous giant stars. What gives?
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