Fundamental parameters and intrinsic colors of F, G, and K supergiants and classical cepheids
| Autor: | V. V. Kovtyukh, S. I. Belik, V. Malyuto, M. P. Yasinskaya, F. A. Chekhonadskikh, Caroline Soubiran |
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| Přispěvatelé: | Astronomical observatory of Odessa National University [Odessa], Odessa National I.I.Mechnikov University, Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Odessa Astronomical Observatory |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Physics
Degree (graph theory) Cepheid variable [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Astronomy and Astrophysics Astrophysics 010501 environmental sciences Stellar classification 01 natural sciences Spectral line Galaxy Luminosity Space and Planetary Science Ratio method 0103 physical sciences Supergiant 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Kinematics and Physics of Celestial Bodies Kinematics and Physics of Celestial Bodies, 2008, 24, pp.171-175. ⟨10.3103/S0884591308030057⟩ |
| DOI: | 10.3103/S0884591308030057⟩ |
| Popis: | We used high-resolution echelle spectra with high signal-to-noise ratio to determine with a high degree of accuracy some atmospheric parameters (Teff, log g and [Fe/H]) for 68 non-variable supergiants of types F, G, and K and 26 classical Cepheids in 302 pulsation phases. Very accurate effective temperatures, with errors of only 10–30 K, were determined by the line-depth ratio method. We found that the observed intrinsic color indices (B − V)0 can be related to these parameters: (B − V)0 = 57.984− 10.3587(log Teff)2 + 1.67572(log Teff)3 − 3.356 log g+ 0.321 Vt + 0.2615[Fe/H] + 0.8833log g(log Teff). With this empirical relation, the intrinsic colors of individual supergiants and classical Cepheids of spectral types F0-K0 and of luminosity classes I and II can be estimated with an accuracy as high as 0.05m, which is comparable to the accuracy of the most elaborate photometric procedures. In view of large distances to supergiants, the method we propose here allows a large-scale mapping of interstellar extinction with an accuracy of 0.1–0.2m in a quite large region of the Galaxy. |
| Databáze: | OpenAIRE |
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