Spectroscopic observations of both components of the variable double star X Ophiuchi
By: by Paul W. Merrill ...
Series: Contributions from the Mount Wilson Observatory.; no. 261
Published: 1923
Place of publication: [Chicago
Language: eng
Subjects: Variable stars.; Double stars.; Stars -- Spectra.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. LVII, 1923."