Dependence of Stellar Chromospheres on Metal Abundance Rotation, and Age
Abstract
It is proposed to study the stellar chromospheric emission and its dependence on metal abundances, rotation and age. If the emission is enhanced by rapid rotation of the stars it will indicate that acoustic heating will be unimportant for the formation of chromospheres and coronae since the acoustic flux generation should not depend on rotation. We want to study variability in the chromospheric emission of some supergiants. We also want to determine luminosity differences between normal stars and metallic line stars. These measurements will also provide bolometric corrections for these stars. For stars with known angular diameters effective temperatures can be determined directly. This study will show whether different surface metal abundance is the only major difference between metallic line A stars and normal A stars as suggested by the diffusion hypothesis.
- Publication:
-
IUE Proposal
- Pub Date:
- 1980
- Bibcode:
- 1980iue..prop..412B