Additional radial velocities of supergiants in the Small Magellanic Cloud.
Abstract
Additional radial velocities of 28 SMC supergiants determined in the years 1959-1969 at the Radcliffe Observatory are presented. These and other measures from ESO and elsewhere are intercompared. The mean Radcliffe velocities have an internal standard error of + or - 4.7 km/s, and a systematic error exceeding 4 km/s is regarded as unlikely. Eight stars in the SMC core have a corrected velocity dispersion of only 6.9 km/s, similar to Feast's (1970) values for H II regions in the core. But the core H II regions have a velocity differential of -20 km/s relative to these stars. The velocity dispersion for stars in other parts of the Cloud is of the order of 15 km/s, as previously found. Two possibly variable-velocity stars are discussed without reaching a satisfactory conclusion.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1978
- DOI:
- 10.1093/mnras/184.4.699
- Bibcode:
- 1978MNRAS.184..699T
- Keywords:
-
- Magellanic Clouds;
- Radial Velocity;
- Supergiant Stars;
- Astronomical Spectroscopy;
- H Alpha Line;
- H Ii Regions;
- Histograms;
- Spectrographs;
- Stellar Motions;
- Variable Stars;
- Velocity Distribution;
- Velocity Measurement;
- Astrophysics;
- Magellanic Clouds:Supergiants;
- Radial Velocities:Supergiants