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| Paper: |
Variability in K Giants |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
755 |
| Authors: |
Fekel, Francis C.; Henry, Gregory W. |
| Abstract: |
As part of a program to monitor solar-type stars for low-amplitude variability with the TSU/SAO 0.8-m automatic photoelectric telescope, a number of presumed late-G and K giants were used as comparison and check stars. Over two dozen have been found to be variable with amplitudes up to 7%. Spectroscopic observations have been obtained to determine additional characteristics, including spectral type, projected rotational velocity, and duplicity, of a subsample of those stars. Our observations show that photometric variability extends from the M0 giants into the K giants. The amplitude of variability decreases with earlier spectral type. The type of variability, pulsation, starspots, or a combination of the two, remains uncertain. |
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