Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..412..103v&link_type=abstract
The Biggest, Baddest, Coolest Stars ASP Conference Series, Vol. 412, proceedings of the workshop held 16-18 July 2007, at the Mi
Astronomy and Astrophysics
Astronomy
Scientific paper
I will present angular diameters for 42 luminosity class I stars and 32 luminosity class II stars that have been interferometrically determined with the Palomar Testbed Interferometer. Derived values of radius and effective temperature are established for these objects, and an empirical calibration of these parameters for supergiants will be presented as a function of spectral type and colors. For the effective temperature versus V_0-K_0 color, I find an empirical calibration with a median deviation of Δ T = 70K in the range of 0.7 < V-K < 5.1 for LC I stars; for LC II, the median deviation is Δ T = 120K from 0.4 < V-K < 4.3. Directly determined diameters range up to 400 R_&sun;, though are limited by poor distance determinations, which dominate the error estimates.
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