Year: 1955
Type: article
Abstract: The s Canis Majoris variable o Scorpii (a = 16h 15m, O = 25° 21', 1900; Bl III ; mag. 3. 1) has been the subject of numerous spectrographic investigations, the most recent being those by R. D. Levee j1 O. Struve, D. H. McNamara, and V. Zebergs ;2 and Su-Shu Huang and O. Struve.3 It has also been the subject of photoelectric studies made by J. Stebbins4 and by A. R. Hogg, K. Gottlieb, G. V. Simonow, and Beryl Hall.5 The earlier of these photometric studies served only to indicate the variable nature of the star, while the later resulted in complete light-curves. Combining the photoelectric measures of Hogg, Gottlieb, Simonow, and Hall with his own spectrographic results, Levee concluded that minimum light occurs at minimum radial velocity, a phase relationship which is inconsistent with the relations found for the other s Canis Majoris variables. In reducing the observations to a common epoch, it was necessary for Levee to bring forward the photometric observations over a time interval of 409 and 1521 days (1656 and 6161 cycles). It therefore appeared important to obtain simultaneous, or nearly simultaneous, photometric and spectrographic observations in order to investigate this relationship further. Such a set of observations, obtained on the night of 1954 May 16 U.T., is displayed in Figure 1. Photoelectric observations, made on the night of 1954 April 11, are also plotted, the reduction to the common epoch having been made by using the period P = 0.246841 day (Hogg et al.5). The radial velocities, which are from 100-inch coude spectrograms, constitute a part of the spectrographic material discussed elsewhere.2' 3 * The spectrographic material used in this paper was obtained by Mr. Struve as guest investigator at the Mount Wilson Observatory; the photoelectric material was obtained by Mr. Williams at the Lick Observatory.
DOI: 10.1086/126812
Authors: A. D. Williams, Otto Struve
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1997139688