VizieR Online Data Catalog: Tycho-2 red giant branch and carbon stars (Gontcharov, 2011)

Our study showed that the broadband multicolor photometry from the 2MASS and Tycho-2 catalogues is enough to produce a pure (with an admixture of less than 1%) sample of RGB stars complete within 500pc of the Sun, to classify the sample stars into types K, M, and C, suspected supergiants, and S stars, to calculate the interstellar extinction, and to determine the photometric distances of K, M, and C stars with an accuracy of 40%.

(1 data file).