Studies of "Irregularity" in Pulsating Red Giants. III. Many More Stars, an Overview, and Some Conclusions

Volume 39 number 1 (2011)

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John R. Percy

Department of Astronomy and Astrophysics, University of Toronto, Toronto ON Canada M5S 3H4

Emil Terziev

Department of Astronomy and Astrophysics, University of Toronto, Toronto ON Canada M5S 3H4

Abstract

We have analyzed AAVSO visual observations of an additional 85 "irregular" (L-type) pulsating red giants, using Fourier and self-correlation analysis; see JAAVSO, 37, 71 (2009) and JAAVSO, 38, 161 (2010) for details of the methods and previous results. We have categorized the variability of each star (periodic/semiregular, irregular, or not significantly variable), and noted the presence of various spurious effects arising from the visual observing process. Finally, we have suggested which stars should be highest priority for further visual or photoelectric observation, and which could reasonably be dropped from the visual program, and why.