Spitzer observations of large amplitude variables in the LMC and IC 1613
1 South African Astronomical Observatory & Astronomy Department, University of Cape Town, South Africa
2 Division of Physics, Mathematics and Astronomy, CIT, Pasadena, CA 91125, USA
3 NASA Goddard Space Flight Center, MC 665, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
4 Department of Astronomy, University of Maryland, College Park, MD 20742, USA
Published online: 8 September 2017
The 3.6 and 4.5 ìm characteristics of asymptotic giant branch variables in the LMC and IC 1613 are discussed. For C-rich Mira variables there is a very clear periodluminosity-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] periodluminosity relation for dusty stars is approximately one mag brighter than for their naked counterparts with comparable periods.
© The Authors, published by EDP Sciences, 2017
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