Infrared Properties of OGLE4 Mira variables in our Galaxy

TL;DR

This study analyzes the infrared properties of OGLE4 Mira variables in our Galaxy, updates the AGB star catalog, and compares observations with theoretical dust shell models, revealing correlations between IR flux, color, and period.

Contribution

It provides a comprehensive IR analysis of Mira variables, updates the Galactic AGB star catalog, and validates dust shell models against IR observations.

Findings

Longer period Mira variables are brighter in IR fluxes and redder in IR colors.

New catalog of 74,093 AGB stars, including O-rich and C-rich types.

Basic dust shell models explain IR observations for most AGB stars.

Abstract

We investigate infrared properties of OGLE4 Mira variables in our Galaxy. For each object, we cross-identify the AllWISE, 2MASS, Gaia, and IRAS counterparts. We present various IR two-color diagrams (2CDs) and period-magnitude and period-color relations for the Mira variables. Generally, the Mira variables with longer periods are brighter in the IR fluxes and redder in the IR colors. In this work, we also revise and update the previous catalog of AGB stars in our Galaxy using the new sample of OGLE4 Mira variables. Now, we present a new catalog of 74,093 (64,609 O-rich and 9484 C-rich) AGB stars in our Galaxy. A group of 23,314 (19,196 O-rich and 4118 C-rich) AGB stars are identified based on the IRAS PSC and another group of 50,779 (45,413 O-rich and 5366 C-rich) AGB stars are identified based on the AllWISE source catalog. For all of the AGB stars, we cross-identify the IRAS, AKARI, MSX, AllWISE, 2MASS, OGLE4, Gaia, and AAVSO counterparts and present various infrared 2CDs. Comparing the observations with the theory, we find that basic theoretical dust shell models can account for the IR observations fairly well for most of the AGB stars.