The Spectral Sequence

  • Jack MartinEmail author
Part of the Astronomer's Pocket Field Guide book series (ASTROPOC)


The Spectral sequence is a surface temperature sequence pioneered by Father Angelo Secchi in 1866 and developed at Marvard in the 1890’s by EC pickering, Williamina Fleming Antonia Maury and Annie Cannon resulting in the Famous seven letter sequence OBAFGKM. The Marvard-Drape system was further improved at the yerkes observatory in 1943 by William Morgan, Phillip Keenan and Edith Kellman, known as the MKK system in which the spectral characteristics are related to the luminosity of the star concerned.

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Forest GateLondonUnited Kingdom

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