Spitzer Observations of Large Amplitude Variables in the LMC and IC 1613

Abstract

The 3.6 and 4.5 micron characteristics of AGB variables in the LMC and IC1613 are discussed. For C-rich Mira variables there is a very clear period-luminosity-colour relation, where the [3.6]-[4.5] colour is associated with the amount of circumstellar material and correlated with the pulsation amplitude. The [4.5] period-luminosity relation for dusty stars is approximately one mag brighter than for their naked counterparts with comparable periods.

5 pages, 4 figures, to appear in Proceedings of "Wide-Field Variability Surveys: A 21st Century Perspective"

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• Near-Infrared Stellar Populations in the metal-poor, Dwarf irregular Galaxies Sextans A and Leo A
• Semi-regular red giants as distance indicators I. The period-luminosity relations of semi-regular variables revisited
• The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VI. The Star Formation History and Dust Production in Andromeda IX
• Infrared variable stars in the compact elliptical galaxy M32
• Hubble Space Telescope Imaging of Luminous Extragalactic Infrared Transients and Variables from the SPIRITS Survey
• AGB Variables in Local Group Dwarf Irregular Galaxies
• AT 2019qyl in NGC 300: Internal Collisions in the Early Outflow from a Very Fast Nova in a Symbiotic Binary