Difference of photometric properties between regular and non-regular Miras in the Magellanic Clouds

Abstract

Mira variables are asymptotic giant branch pulsating stars with long pulsation periods and large amplitudes in optical bands. By applying the random forest algorithm to the I-band light curves for the Miras in the Magellanic Clouds, we have classified these Miras into regular Miras and non-regular Miras. Wherein non-regular Miras exhibit a long-term variation in addition to their primary pulsation periods. Our results confirm that the period-luminosity relation for maximum light has a smaller dispersion, but only occurs on the regular oxygen-rich (O-rich) Miras, which we recommend to be applied in future distance scale work. We have also collected multi-band photometry for these Miras to perform a spectral-energy-distribution (SED) fitting with stellar and dust components, showing that a significant fraction of dust is present around the non-regular Miras. According to our results, we believe that the periodic long-term variations seen in the non-regular Miras might be due to the presence of dust.

References in corpus (11)

• The Gaia mission
• A distance to the Large Magellanic Cloud that is precise to one per cent
• The Second-Generation Guide Star Catalog: Description and Properties
• The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging
• The CatWISE2020 Catalog
• Hot Stuff for One Year (HSOY) - A 583 million star proper motion catalogue derived from Gaia DR1 and PPMXL
• Large Magellanic Cloud Near-Infrared Synoptic Survey. V. Period-Luminosity Relations of Miras
• Modelling Long-Period Variables -- II. Fundamental mode pulsation in the nonlinear regime
• A Machine Learning Approach For Classifying Low-mass X-ray Binaries Based On Their Compact Object Nature
• Diagnosing the Clumpy Protoplanetary Disk of the UXor Type Young Star GM Cephei
• HO Puppis: Not a Be Star but a Newly Confirmed IW And-Type Star

Cited by in corpus (4)

• The period--luminosity relation for Mira variables in the Milky Way using Gaia DR3: a further distance anchor for $H_0$
• Mira variables in the Milky Way's nuclear stellar disc: discovery and classification
• A Distance Measurement to M33 Using Optical Photometry of Mira Variables
• Zwicky Transient Facility and Globular Clusters: the gr-Band Period-Luminosity Relations for Mira Variables at Maximum Light and Their Applications to Local Galaxies