Analysis of ASAS-SN Observations of Short-Period Mira Stars

Volume 48 number 2 (2020)

Download this article (pdf)

John R. Percy

Department of Astronomy and Astrophysics, and Dunlap Institute of Astronomy and Astrophysics, University of Toronto, Toronto ON M5S 3H4, Canada; john.percy@utoronto.ca

Patricia Golaszewska

Department of Astronomy and Astrophysics, and Dunlap Institute of Astronomy and Astrophysics, University of Toronto, Toronto ON M5S 3H4, Canada; john.percy@utoronto.ca

Abstract

We have analyzed observations of a uniform sample of 36 stars in the ASAS-SN variable star catalog, with mean magnitudes between 10 and 12, classified as Mira by the catalog, and with periods of 150 days or less. They presumably represent a transition from Mira type to semiregular type. The stars show a wide variety of light curve shapes, and of deviation from periodicity. The amplitude increases with increasing period, as is well known, but no other properties, including the degree of periodicity, seem to depend on period.