Photometric properties of carbon stars in the Small Magellanic Cloud
  The Optical Gravitational Lensing Experiment identified over 1,800 carbon-rich Mira and semi-regular variables in the Small Magellanic Cloud. Multi-epoch infrared photometry reveals that the semi-regulars and Miras follow different sequences in color-color space when using colors sensitive to molecular absorption bands. The dustiest Miras have the strongest pulsation amplitudes and longest periods. Efforts to determine bolometric magnitudes reveal possible systematic errors with published bolometric corrections. 
G.C. Sloan, E. Lagadec, K.E. Kraemer, M.L. Boyer, S. Srinivasan, I.   McDonald, and A.A. Zijlstra
astro-ph.SR