oa MNASSA : Monthly Notes of the Astronomical Society of South Africa - Clusters and associations
|Article Title||Clusters and associations|
|© Publisher:||Astronomical Society of Southern Africa (ASSA)|
|Journal||MNASSA : Monthly Notes of the Astronomical Society of South Africa|
|Author||J.H. Thackery, A.D. & Oort|
|Publication Date||Jan 1942|
|Pages||165 - 168|
|Keyword(s)||B-type stars, Cordoba Resultados, Cordoba table, Expansion velocity, Galactic rotation, Gaseous disc, Karpa Crucis cluster, Newtonian focus, Population, Scorpio-Centaurus cluster, Ursa Major and Velocity relative to the Sun|
Since Sir John Herschel published positions of 100 stars in this cluster from his micrometer observations (1834-38) a number of attempts have been made to detect differential motions of individual stars (W. C. Russell, 1872; Gould, 1882; Nangle, 1908). The only published photographic observations known to the writer are those by Gould (Cordoba Resultados Vol. 19).
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