Spectroscopic survey of γ Doradus stars – I. Comprehensive atmospheric parameters and abundance analysis of γ Doradus stars
| Autor: | K. R. Pollard, P. M. Kilmartin, Z. Kołaczkowski, Esin Soydugan, K. Uytterhoeven, J. H. Telting, E. Niemczura, Jakub Ostrowski, Ennio Poretti, Monica Rainer, F. Kahraman Aliçavuş, P. De Cat, L. Mantegazza, Juan Carlos Suárez |
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| Přispěvatelé: | ITA, ESP, BEL, NZL, POL, TUR |
| Rok vydání: | 2016 |
| Předmět: |
Physics
010308 nuclear & particles physics Diagram Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Stellar classification 01 natural sciences Spectral line Luminosity Stars Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Abundance (ecology) 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Spectral energy distribution Astrophysics::Earth and Planetary Astrophysics Instability strip 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 458:2307-2322 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stw393 |
| Popis: | We present a spectroscopic survey of known and candidate $\gamma$\,Doradus stars. The high-resolution, high signal-to-noise spectra of 52 objects were collected by five different spectrographs. The spectral classification, atmospheric parameters (\teff, $\log g$, $\xi$), $v\sin i$ and chemical composition of the stars were derived. The stellar spectral and luminosity classes were found between G0-A7 and IV-V, respectively. The initial values for \teff\ and \logg\ were determined from the photometric indices and spectral energy distribution. Those parameters were improved by the analysis of hydrogen lines. The final values of \teff, \logg\ and $\xi$ were derived from the iron lines analysis. The \teff\ values were found between 6000\,K and 7900\,K, while \logg\,values range from 3.8 to 4.5\,dex. Chemical abundances and $v\sin i$ values were derived by the spectrum synthesis method. The $v\sin i$ values were found between 5 and 240\,km\,s$^{-1}$. The chemical abundance pattern of $\gamma$\,Doradus stars were compared with the pattern of non-pulsating stars. It turned out that there is no significant difference in abundance patterns between these two groups. Additionally, the relations between the atmospheric parameters and the pulsation quantities were checked. A strong correlation between the $v\sin i$ and the pulsation periods of $\gamma$\,Doradus variables was obtained. The accurate positions of the analysed stars in the H-R diagram have been shown. Most of our objects are located inside or close to the blue edge of the theoretical instability strip of $\gamma$\,Doradus. Comment: 18 pages, 13 figures |
| Databáze: | OpenAIRE |
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