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G.T. van Belle (JPL), R.R. Thompson (U. Wyoming)
We present 22 oxygen-rich Mira variable stars made at IOTA (IR Optical Telescope Array). These observations build upon the previous angular size measurements of 27 oxygen-rich, carbon, and S-type Miras found in van Belle et al. (1996, 1997); in total, this data set has angular sizes of 49 Miras, of which 12 have been observed over multiple epochs. The measurements are part of a long term observational program to directly ascertain the oscillation mode of these variables. From the data, the Rosseland mean diameter is calculated from Mira atmospheric models. Estimates of bolometric flux for these stars, combined with the diameter measurements, are used to calculate effective temperatures, TEFF. Using distance estimates for these stars, linear sizes are also calculated, and the phase dependence of radius is discussed. Comparison of these data with the predictions of pulsation theory is also presented.
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