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Stellar Atmospheric Parameters from Full Spectrum Fitting of Intermediate- and High-resolution Spectra against PHOENIX/BT-Settl Synthetic Stellar Atmospheresстатья
Информация о цитировании статьи получена из
Web of Science
Дата последнего поиска статьи во внешних источниках: 1 февраля 2021 г.
- Авторы: Rubtsov E., Chilingarian I., Borisov S., Katkov I.
- Сборник: Astronomical Data Analysis Software and Systems XXVIII
- Серия: Astronomical Society of the Pacific Conference Series
- Том: 523
- Год издания: 2019
- Место издания: Astronomical Society of the Pacific Conference Series College Park, Maryland, USA
- Первая страница: 289
- Последняя страница: 292
- Аннотация: We present a new technique implemented in IDL for determination of the parameters of stellar atmospheres using PHOENIX and BT-Settl synthetic stellar spectra. The synthetic spectra provide good coverage in the Teff, log(g), [Fe/H], [α/H] parameter space over a wide wavelength range and allow fitting observed spectra of a vast majority of stars. Our procedure also determines radial velocities and stellar rotation and it takes into account flux calibration imperfections by fitting a polynomial continuum. Thanks to using pixel fitting we can exclude certain spectral features which are not present in the models such as emission lines (chromospheric emission in late-type stars or discs around Be stars). We perform a non-linear χ2 minimization with the Levenberg-Marquardt method that is applied to the entire spectrum with the exception of areas with peculiarities: emission lines, model shortcomings (incompleteness of the spectral line lists used for the atmospheric model calculation). We compare the results of the analysis of optical spectra from ELODIE and INDO-US stellar libraries.
- Добавил в систему: Рубцов Евгений Валерьевич