Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989)

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Mk Spectral Classification, Spectral Types, Stars: Late-Type, Stars: Standard

Scientific paper

The catalog contains 1054 standard stars of spectral types G0 and later (G, K, M, and a few S stars) classified on the Revised MK system at the Perkins Observatory. The revised MK system is described by Keenan (1987), and the present list is an expansion of and supersedes one published by Keenan and Yorka (1988). The spectrograms used for the classification were taken at four different observatories; hence, extensive comparisons have been made to ensure consistency between the Northern and Southern Hemispheres. The list provides a consistent set of standards in most parts of the sky and over a considerable range in magnitude. Omitted are stars of spectral types R and N, Mira variables, and stars of other groups (e.g., BY Dra variables) having spectra that are composite or so peculiar that they are not satisfactorily classified on the present system. The catalog includes star names (including Bayer and Flamsteed designations), numbers from The Bright Star Catalog, HD numbers, photoelectric V magnitudes, and spectral types. (1 data file).

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