Additional radial velocities of the Cepheid binary W Sagittarii.
Abstract
Radial-velocities of W Sgr from 28 coudespectrograms taken during 1980-1983 are presented, along with velocities of certain standard stars. A mean velocity of -28.0 + or - 0.7 km/s for a mean epoch of 1981.96 is found. The 1980-1983 data indicate that the orbital period is longer than the 80 years previously suggested, and that the spectroscopic orbit cannot be obtained at this time. Further observations with high accuracy are required so as to obtain the distance and mass of this speckle and spectroscopic binary.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- August 1984
- DOI:
- 10.1086/131395
- Bibcode:
- 1984PASP...96..630J
- Keywords:
-
- Binary Stars;
- Cepheid Variables;
- Radial Velocity;
- Reference Stars;
- Spectrograms;
- Astronomy