Long Term Photometric and Spectroscopic Monitoring of Semiregular Variable Stars


Robert R. Cadmus, Jr.

Department of Physics, Grinnell College, Grinnell, IA 50112

Received September 12, 2014; revised December 8, 2014; accepted December 9, 2014


The understanding of semiregular variable stars presents a number of challenges that can be addressed by consistent long term photometric and spectroscopic monitoring. The observing program at Grinnell College has generated a large body of such data that has been used to investigate modes of pulsation, the role of dust, the possible role of chaos, and other issues. This paper summarizes these efforts and encourages other observers to help maintain the continuity of these data sets.