KOVTYUKH, V. V.; SOUBIRAN, C.; BELIK, S. I.; YASINSKAYA, M. P.; CHEHONADSKIH, F. A.; MALYUTO, V.

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KOVTYUKH, V. V.
Astronomical observatory of Odessa National University [Odessa]

SOUBIRAN, C.
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

BELIK, S. I.
Odessa Astronomical Observatory

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Article de revue

Ce document a été publié dans

Odessa Astronomical Publications. 2007, vol. 20, p. 91

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Résumé en anglais

We derive accurate, homogeneous atmospheric parameters (Teff , log g, Vt, [Fe/H]) for 74 FGK non-variable supergiants and for 30 classical cepheids in 302 pulsation phases based on the highresolution, high signal-to-noise echelle spectra. The extremely high precision of the effective temperature determination (10-30 K) is achieved by using the line-depth ratio method. These parameters are correlated with unreddened B-V colour index compiled from the literature for investigated stars to obtain an empirical relationship of the form (B-V )0 = 57.984 - 10.3587(logTeff )2 + +1.67572(logTeff )3 - 3.356logg + 0.0321Vt+ +0.2615[Fe/H] + 0.8833(logg)(logTeff) This expression have been used for the estimation of the colour excesses E(B-V) of individual supergiants and classical cepheids with an error 0.05 mag, which matches precision of the most sophisticated photometric techniques. The application range is F0-K0, luminosity classes I and II. Considering the large distances of supergiants, this method opens up a possibility for the large-scale extinction mapping of the Galaxy, with sensitivity down to 0.1-0.2 mag.< Réduire

Mots clés en anglais

Stars: fundamental parameters

stars: colour excesses

stars: supergiants

stars: classical cepheids

stars: classical cepheids.

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Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804