Rotation and chemical abundances in the peculiar A stars - II.
Abstract
New measurements of the distribution of silicon line strengths amongst early type stars having similar atmospheric structures do not allow a clear-cut separation into normal and anomalous types. It is shown that those stars having line strengths much larger than the mean tend to have rotational velocities less than 200 km -1 It is likely that in many, if not most, strong-line stars no single temperature and pressure parameters will suffice to describe the atmosphere, and the assumption of a mean temperature can lead to large errors in the derived abundances of all but a few elements. The production of stars described by the oblique rotator model is discussed briefly.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- 1970
- DOI:
- 10.1093/mnras/147.1.75
- Bibcode:
- 1970MNRAS.147...75D