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

Автор(и)

  • V. V. Kovtyukh Astronomical Observatory of Odessa National University Marazlievskaya, 1v 65014 Odessa, Ukraine, Ukraine

DOI:

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

Ключові слова:

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

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.

Посилання

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2017-04-10

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