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G.T. van Belle (Jet Propulsion Laboratory), M.J. Creech-Eakman (Caltech - JPL), R.R. Thompson (U. Wyoming - JPL)
Using the Palomar Testbed Interferometer (PTI), over the past four years we have measured angular diameters in the H and K bands for over 200 stars, ranging in spectral type from B7 to M8, and spanning all luminosity classes. These diameters are part of an ongoing observational program at PTI to empirically establish effective temperatures and linear radii for these stars, in combination with existing photometry and Hipparcos distances for these objects. The dependence of these two parameters upon spectral type, luminosity class and V-K color is explored for consistency with and departures from expected trends. In contrast to our earlier work (van Belle et al. 1999), four new areas are emphasized: First, 0.1-micron narrowband measurements across the K band are examined in detail. Second, a large subset of the newly observed stars has also been observed interferometrically in the visible, allowing for a comparison of the relative sizes. Third, an emphasis on earlier type objects has resulted in a emphasis on B, A, F and G spectral types, complimenting our earlier investigation. Lastly, the temporal consistency of the angular sizes of these non-variable stars is confirmed. We gratefully acknowledge support of the instrumentation for PTI through NASA.
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