Shapley–Sawyer Concentration Class
- Shapley–Sawyer Concentration Class
The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for globular clusters according to their concentration. The most highly concentrated clusters such as M75 are classified as Class I, with successively diminishing concentrations ranging to Class XII, such as Palomar 12. (The class is sometimes given with numbers [Class 1–12] rather than with Roman numerals.)
History
From 1927–1929, Harlow Shapley and Helen Sawyer Hogg began categorizing clusters according to the degree of concentration the system has toward the core using this scale. This became known as the "Shapley–Sawyer Concentration Class".[cite journal]
last = Hogg
first = Helen Battles Sawyer
year = 1965
title = Harlow Shapley and Globular Clusters
journal = Publications of the Astronomical Society of the Pacific
volume = 77
issue = 458
pages = 336–46
url = http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1965PASP...77..336S
doi = 10.1086/128229] References
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