New Generation Stellar Spectral Libraries in the Optical and Near-Infrared I: The Recalibrated UVES-POP Library for Stellar Population Synthesis

Borisov, S.; Chilingarian, I.; Rubtsov, E.; Ledoux, C.; Melo, C.; Grishin, K.; Katkov, I.; Goradzhanov, V.; Afanasiev, A.; Kasparova, A.; Saburova, A.

Авторы: Borisov Sviatoslav, Chilingarian Igor, Rubtsov Evgenii, Ledoux Cédric, Melo Claudio, Grishin Kirill, Katkov Ivan, Goradzhanov Vladimir, Afanasiev Anton, Kasparova Anastasia, Saburova Anna
Журнал: Astrophysical Journal, Supplement Series
Том: 266
Номер: 1
Год издания: 2023
Издательство: University of Chicago Press
Местоположение издательства: United States
Номер статьи: 11
DOI: 10.3847/1538-4365/acc321
Аннотация: We present re-processed flux calibrated spectra of 406 stars from the UVES-POP stellar library in the wavelength range 320-1025 nm, which can be used for stellar population synthesis. The spectra are provided in the two versions having spectral resolving power R=20,000 and R=80,000. Raw spectra from the ESO data archive were re-reduced using the latest version of the UVES data reduction pipeline with some additional algorithms that we developed. The most significant improvements in comparison with the original UVES-POP release are: (i) an updated Echelle order merging, which eliminates "ripples" present in the published spectra, (ii) a full telluric correction, (iii) merging of non-overlapping UVES spectral setups taking into account the global continuum shape, (iv) a spectrophotometric correction and absolute flux calibration, and (v) estimates of the interstellar extinction. For 364 stars from our sample, we computed atmospheric parameters Teff, surface gravity log g, metallicity [Fe/H], and alpha-element enhancement [alpha/Fe] by using a full spectrum fitting technique based on a grid of synthetic stellar atmospheres and a novel minimization algorithm. We also provide projected rotational velocity v*sin(i) and radial velocity Vrad estimates. The overall absolute flux uncertainty in the re-processed dataset is better than 2% with sub-% accuracy for about half of the stars. A comparison of the recalibrated UVES-POP spectra with other spectral libraries shows a very good agreement in flux; at the same time, Gaia DR3 BP/RP spectra are often discrepant with our data, which we attribute to spectrophotometric calibration issues in Gaia DR3.
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New Generation Stellar Spectral Libraries in the Optical and Near-Infrared I: The Recalibrated UVES-POP Library for Stellar Population Synthesisстатья Исследовательская статья

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