Other
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1982d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 5, p. 1982-1985.
Other
29
Limb Darkening, M Stars, Michelson Interferometers, Stellar Temperature, Supergiant Stars, Optical Thickness, Stellar Envelopes, Stellar Luminosity
Scientific paper
We present new Michelson interferometry at 2.2 microns of the M supergiant Alpha Ori. The limb-darkened diameter derived from the observations leads to an estimate of the effective temperature of T(EFF) = 3520 +/- 85 K. We believe this estimate to be largely free of contamination effects from the circumstellar dust shell. This temperature is about 250 K cooler than giants of the same spectral type. We note that Alpha Her, another M supergiant measured with the interferometer, is also about 160 K cooler than its luminosity class III analogs. We conclude that there is evidence for a temperature dependence on luminosity class at a fixed spectral type for M stars.
Benson Andrew J.
Dixon D. J.
Dyck Mel H.
Ridgway Stephen T.
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