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| Paper: |
Okayama Project: Solar-like Oscillations in Sub-giants and Giants |
| Volume: |
462, Progress in Solar/Stellar Physics with Helio- and Asteroseismology |
| Page: |
220 |
| Authors: |
Ando, H.; Kambe, E.; Sato, B. |
| Abstract: |
We conducted precise radial-velocity measurements of four G-type giants (11 Com, ζ Hya, ε Tau, and η Her) and of one sub-giant (κ CrB) with use of an iodine cell at Okayama Astrophysical Observatory. Short-term variations with amplitudes of 1 – 7 m s-1 and periods of 1 – 10 h were detected. We determined the large frequency separation to construct échelle diagrams of oscillation frequencies for our targets. Odd-even mode sequences (degree) are clearly seen in these diagrams for those stars, with some irregular pattern, suggesting the existence of mixed modes.
Based on the theory of Dupret et al. (2009), we show that these échelle diagrams may distinguish stellar structures along the giant branch. |
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