21st Annual Student Research Conference
Spectroscopic Monitoring of Mira-type and Semi-regular Variable Stars
Adam J. Vogt
Dr. Matthew M. Beaky, Faculty Mentor
With the rise in availability of spectroscopic equipment for smaller telescopes, comprehensive phase-dependent spectroscopic monitoring of variable stars has become a reality. Pulsating variable stars on the asymptotic giant branch (AGB), including both long period Mira-type variables and smaller amplitude semi-regular variables, are known to have complex atmospheric structures that contain heavier elements and molecules characteristic of cooler, late-life stars. Spectroscopic measurements taken at regular intervals over their pulsation cycle reveal changes in spectral features over time, such as changes in molecular band strengths and transitions from absorption to emission in the Hydrogen Balmer series. We have begun a program of spectroscopic monitoring of AGB variables at the Truman Observatory in order to catalog and quantify changes in their spectra as a function of phase. Spectra taken at approximately 10-day intervals for two Mira-type variables and two semi-regular variables will be presented.
Keywords: spectroscopy, astronomy, variable stars, Truman Observatory, Mira variables, semi-regular variables
Topic(s):Physics
Presentation Type: Oral Paper
Session: 11-3
Location: VH 1416
Time: 8:45