Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke3877.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 3877. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astronomy
History And Archaeoastronomy, Biographies
Scientific paper
American astronomer, staff member of the Yerkes Observatory, with Philip Keenan introduced stellar luminosity classes and the Morgan-Keenan (MK) classification scheme of stars based on the appearance of their spectra. With his students Donald E Osterbrock and Stewart Sharpless, he discovered the two nearest spiral arms in the Galaxy by mapping the distribution of bright O- and B-type stars whose...
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