Heterochromatic Studies of the Companions of Sirius, of O Ceti, and of o_{2} Eridani

Abstract

view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Heterochromatic Studies of the Companions of Sirius, of O Ceti, and of o_{2} Eridani Hetzler, Charles Abstract A simple device is described whereby the components of Sirius were separated at the photographic focus of the Thaw refractor. Methods of separation in the red and ultra- violet are sketched. Magnitudes for a number of Sirius field stars are derived in terms of the B9 field star, BD - 17°161 i, of magnitude 6.76. The resulting photograpFdc and red magnitudes of Sirius B, of probable error less than o~'i, are 7~95 and 8~~44, respec- tively, as compared with Wendell's visual value of 8~4, confirmed by Kuiper at Leiden and at the Lick Observatory, and with Vyssotsky's pI~oto-visua1 value of 7~I. TI~e corresponding magnitude of Sirius A is - i ~ without appreciable color index. Photo- graphic positions of components A and B of Sirius relative to field stars are given at intervals since 1932; resulting values of p and 0 are compared with calculated posi- tions and with recent visual observations. No sign of a third component is visible. Photographic and ultra-violet observations of o Ceti B are described. The photo- graphic magnitude in terms of that assumed for the distant companion to o Ceti is i 1.2. Several measurements of p and 0 are tabulated. As a comparison, the red and ultra-violet indices of 02 Eridani B are found to agree with those of Sirius B Publication: The Astrophysical Journal Pub Date: July 1935 DOI: 10.1086/143657 Bibcode: 1935ApJ....82...75H full text sources ADS |