Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 378, Issue 2, Pages 617-624Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.11804.x
Keywords
star : fundamental parameters; supergiants; Cepheids
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Precise effective temperatures (T-eff) are determined for 161 FGK supergiants using method of line-depth ratios. We obtain a set of 131 relations for temperatures of supergiants as a function of line depths. These relations have been calibrated against previously published accurate temperature estimates. The application range of the method is 3600-7800 K (F0I-K5I). The internal error of a single calibration is less than 110 K, while combination of all calibrations reduces uncertainty to only 5-30 K (standard error). The error in the zero-point is estimated to be less than 100-200 K. A significant advantage of the line ratio method is its independence of the interstellar reddening, and only modest sensitivity to abundance, macroturbulence, rotation and other factors.
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