The full scan AOT01 speed-4 ISO-SWS observation of Tau has been used to determine the stellar parameters of this K5 giant. Due to the complementarity of the way parameters affect the spectrum in the wavelength range from 2.38-12 µm - like the presence of different molecules which are each dependent in another way on the several stellar parameters - it was possible to pin down the atmospheric parameters with a high accuracy. This resulted in the following parameters = K, g = , M = , z = , = , = , (C) = , (N) = , (O) = and = mas. These parameters were compared with and discussed w.r.t. the results listed by other authors, one of the most striking result being that one should rely more upon a physically determined gravity than upon a spectroscopic gravity. The good consistency between the stellar parameters deduced from the ISO-SWS data, colours, high-resolution (optical) spectra, IRFM,... proves that it is possible to extract good quantative informations from these intermediate-resolution ISO-SWS spectra!
© European Southern Observatory (ESO) 2000
Online publication: December 15, 2000