The Hertzsprung-Russell diagrams for open clusters

K. A. Barkhatova
1959 Symposium - International astronomical union  
The most important relationship between physical characteristics of stars is the spectrum-luminosity correlation. Investigating the character of this correlation for stars of open clusters, Trumpler has worked out a classification of clusters according to their spectral composition.
doi:10.1017/s0074180900177472 fatcat:vwzp5nt67jc7hazcwzob36piwu