HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS
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 r...
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Odessa I. I. Mechnykov National University
2017-04-01
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doaj-f114713ccd8e48c3aa85690900eac4ab2020-11-25T02:32:48ZengOdessa I. I. Mechnykov National UniversityOdessa Astronomical Publications1810-42152017-04-01180707310.18524/1810-4215.2005.18.9825498254HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDSV. V. Kovtyukh0Astronomical Observatory of Odessa National University Marazlievskaya, 1v 65014 Odessa, UkraineWe 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.http://oap.onu.edu.ua/article/view/98254 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
V. V. Kovtyukh |
spellingShingle |
V. V. Kovtyukh HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS Odessa Astronomical Publications |
author_facet |
V. V. Kovtyukh |
author_sort |
V. V. Kovtyukh |
title |
HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS |
title_short |
HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS |
title_full |
HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS |
title_fullStr |
HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS |
title_full_unstemmed |
HIGH PRECISION EFFECTIVE TEMPERATURES OF F-K SUPERGIANTS AND CLASSICAL CEPHEIDS |
title_sort |
high precision effective temperatures of f-k supergiants and classical cepheids |
publisher |
Odessa I. I. Mechnykov National University |
series |
Odessa Astronomical Publications |
issn |
1810-4215 |
publishDate |
2017-04-01 |
description |
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. |
url |
http://oap.onu.edu.ua/article/view/98254 |
work_keys_str_mv |
AT vvkovtyukh highprecisioneffectivetemperaturesoffksupergiantsandclassicalcepheids |
_version_ |
1724817587952418816 |