AAVSO: American Association of Variable Star Observers

Identification and Analysis of Pulsating Red Giants Misclassified by ASAS and ASAS-SN (Abstract)

Volume 48 number 2 (2020)

Kristine Larsen
Central Connecticut State University, 1615 Stanley Street, New Britain, CT 06050; larsen@ccsu.edu


(Abstract only) Pulsating red giant stars (PRG) pose a particular challenge for automated classification algorithms due to their complex and quasiperiodic behavior, leading to their possible erroneous designation as “miscellaneous” class variables (MISC). A subset of variable stars identified as MISC by the All-Sky Automated Survey (ASAS) with extremely long period (over 1000 days) was analyzed. The AAVSO’s vstar statistics program was applied to the stars’ data from ASAS and the All-Sky Automated Survey for Supernovae (ASAS-SN). Examples of several types of PRG behavior were identified, and limitations of several automated classification algorithms made apparent.