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2010ApJ...719..240F - Astrophys. J., 719, 240-263 (2010/August-2)

The Lick/SDSS library. I. Synthetic index definition and calibration.

FRANCHINI M., MOROSSI C., DI MARCANTONIO P., MALAGNINI M.L. and CHAVEZ M.

Abstract (from CDS):

A new synthetic library of spectral feature indices, Lick/Sloan Digital Sky Survey (SDSS), for stellar population studies is presented. Lick/SDSS is computed from synthetic spectra with resolving power R = 1800 to fully exploit the content of the spectroscopic SDSS-DR7 stellar database. The Lick/SDSS system is based on the Lick/IDS one complemented with a UV index in the wavelength region of Ca II H and K lines. The system is well suited to study α-element abundances in F, G, and K stars. The reliability of synthetic indices in reproducing the behaviors of observational ones with effective temperature, surface gravity, overall metallicity, and α-element abundances is tested by using empirical stellar libraries (ELODIE, INDO-U.S., and MILES) and the SDSS-DR7 spectroscopic database. The importance of using the same temperature scale in comparing theoretical and observational indices is discussed. The full consistency between Lick/SDSS and observational indices derived from the above mentioned stellar libraries is assessed. The comparison with indices computed from SDSS-DR7 spectra evidences good consistency for "dwarf" stars and significant disagreement for "giant" stars due to systematic overestimation of the stellar Teff by the SEGUE Stellar Parameter Pipeline.

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Journal keyword(s): galaxies: stellar content - stars: fundamental parameters - stars: late-type

Simbad objects: 73

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2021.04.17-13:54:38

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