COLOUR EXCESSES OF 74 SUPERGIANTS AND 30 CLASSICAL CEPHEIDS

Автор(и)

  • V. V. Kovtyukh Odessa Astronomical Observatory, Odessa National University T.G. Shevchenko Park, Odessa 65014 Ukraine, Ukraine
  • C. Soubiran Observatoire Aquitain des sciences de l'univers, UMR 5804, BP 89, 33270 Floirac, France, France
  • S. I. Belik Odessa Astronomical Observatory, Odessa National University T.G. Shevchenko Park, Odessa 65014 Ukraine, Ukraine
  • M. P. Yasinskaya Odessa Astronomical Observatory, Odessa National University T.G. Shevchenko Park, Odessa 65014 Ukraine, Ukraine
  • F. A. Chehonadskih Odessa Astronomical Observatory, Odessa National University T.G. Shevchenko Park, Odessa 65014 Ukraine, Ukraine
  • V. Malyuto Tartu Observatory, EE2444 Tartumaa, Toravere, Estonia, Estonia

DOI:

https://doi.org/10.18524/1810-4215.2007.20.87038

Ключові слова:

Stars, fundamental parameters, stars, colour excesses, supergiants, classical cepheids.

Анотація

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.

Посилання

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Опубліковано

2007-12-22

Номер

Том 20 № 1 (2007)

Розділ

Статті

Ліцензія

Авторське право (c) 2016 Odessa Astronomical Publications

Creative Commons License

Ця робота ліцензується відповідно до Creative Commons Attribution-NonCommercial 4.0 International License.

Відповідно Закону України про авторське право і суміжні права N 3792-XII від 23 грудня 1993 року