Color-indices in the cluster N.G.C. 1647
By: by Frederick H. Seares ...
Series: Contributions from the Mount Wilson Solar Observatory.; no. 102
Published: 1915
Place of publication: [Chicago
Language: eng
Number of pages: 13
Subjects: Stars -- Color.; Stars -- Clusters.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. XLII, 1915."