HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS

V. V. Kovtyukh

Анотація


We present precise effective temperatures (Teff) of 110 F-K supergiants determined from the method of line depth ratios. For each star, we have measured the line depths a large number of spectral lines of low and high excitation potentials and established ~ 100 relations between Teff and their ratios. These relations have been calibrated against previously published accurate temperature estimates. The range of application of the method is 4000-7000 K (F2-K4). The internal error for a single calibration is less than 110 K, while the combination of all 100 calibrations reduces the uncertainty to only 5-35 K (1 sigma). A big advantage of the line ratio method is its independence on interstellar reddening, spectral resolution, and line broadening due to rotation or microturbulence.

Ключові слова


Stars; fundamental parameters; stars; effective temperatures; stars; supergiants; stars; classical cepheids.

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Посилання


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DOI: https://doi.org/10.18524/1810-4215.2005.18.98254

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