Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.2202h&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #22.02D; Bulletin of the American Astronomical Society, Vol. 25, p.823
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of Arcturus (alpha Boo, K1III) have revealed oscillations with a period of 1.84 days and an amplitude of 160\ m\ s(-1) that may be the result of solar--like p--mode oscillations (Smith, McMillan, and Merline 1987, Cochran, 1988, and Belmonte, Jones, Palle, and Cortes 1990). I observed four stars, with a range of spectral types similar to that of Arcturus, for oscillations with periods on the order of 2 days. I observed alpha Ari, gamma Per, epsilon Tau, and alpha Aur (a close binary composed of two G giants) for 12 nights, observing each star ~ 5 times per night, using the Kitt Peak National Observatory Coude Feed telescope and Fiber Optic Echelle spectrograph to obtain high--resolution spectra. These stars have a range of spectral types from G0III to K2III. These stars were chosen because of their spectral similarity to Arcturus, their brightness, and their fundamental periods of ~ 1 day. By observing several giants with a range of effective temperature, we hope to gain some understanding of the stellar conditions required to support Arcturus--like pulsations.
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