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| Paper: |
FUSE Spectroscopy of A and F Supergiants |
| Volume: |
348, Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE |
| Page: |
165 |
| Authors: |
Brown, A.; Harper, G.M. |
| Abstract: |
A and F supergiants are the descendents of late O and early B main sequence stars. They are undergoing rapid evolution across the HR diagram with significant on-going changes in their internal structure. These yellow supergiants are all post-He-flash stars on “blue loops”. Such stars are of great interest because they have been M supergiants only a short time ago with strong cool stellar winds and with weak or nonexistent coronal activity, but in their blueward evolution strong transition regions and coronae have redeveloped and their stellar winds have altered significantly. The processes by which stellar activity regenerates and wind driving mechanisms change are not well understood. We present the results from FUSE observations of seven A and F supergiants with spectral types between A8 and F8, and show the properties of transition region emission lines, such as C III and O VI, which are ubiquitous on these stars. |
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