High-precision effective temperatures of 161 FGK supergiants from line-depth ratios

Details High-precision effective temperatures of 161 FGK supergiants from line-depth ratios High-precision effective temperatures of 161 FGK supergiants from line-depth ratios

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.378..617k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 378, Issue 2, pp. 617-624.

Astronomy and Astrophysics

Astronomy

24

Star: Fundamental Parameters, Supergiants, Cepheids

Scientific paper

Precise effective temperatures (Teff) 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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