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| Paper: |
Line Profile Variations in gamma Equ: A Puzzle |
| Volume: |
310, Variable Stars in the Local Group (IAU Colloquium 193) |
| Page: |
287 |
| Authors: |
Shibahashi, H.; Kurtz, D.; Kambe, E.; Gough, D. |
| Abstract: |
Line profile variations in γ Equ show the classic blue-to-red traveling bumps of m-modes resolved by rotation, and they have been identified as l= 2 or 3, m = −l or −ll+1 by characterising the line shapes using the moment method. The mode identifications cannot be correct, however, since γ Equ is an extremely slowly rotating star (Prot > 70 yr). We propose an alternative interpretation, according to which the observed line profile variations are a manifestation of a shock wave in the high atmosphere near the magnetic polar regions; the oscillation mode is then still consistent with the photometric observations. |
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