THE LICK/SDSS LIBRARY. I. SYNTHETIC INDEX DEFINITION AND CALIBRATION
- INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste (Italy)
- Dipartimento di Fisica-Sezione di Astronomia, Universita degli Studi di Trieste, and INAF, Via G.B. Tiepolo, 11, I-34131 Trieste (Italy)
- Instituto Nacional de Astrofisica, Optica y Electronica, Luis Enrique Erro 1, 72840, Tonantzintla, Puebla (Mexico)
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 {alpha}-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 {alpha}-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 T {sub eff} by the SEGUE Stellar Parameter Pipeline.
- OSTI ID:
- 21455026
- Journal Information:
- Astrophysical Journal, Vol. 719, Issue 1; Other Information: DOI: 10.1088/0004-637X/719/1/240; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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