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In this paper, we select a sample of quiescent luminous red galaxies (LRGs)from Sloan Digital Sky Survey Data Release 7 (SDSS DR7) with signal-to-noiseratio (S/N) substantially high to study the consistency of the full spectrumfitting method by using different packages, mainly, ULySS and STARLIGHT. Thespectrum of each galaxy in the sample is fitted by the full spectrum fittingpackages ULySS and STARLIGHT, respectively. We find: (1) for spectra withhigher S/Ns, the ages of stellar populations obtained from ULySS are slightlyolder than that from STARLIGHT, and metallicities derived from ULySS areslightly richer than that from STARLIGHT. In general, both packages can giveroughly consistent fitting results. (2) for low S/N spectra, it is possiblethat the fitting by ULySS can be trapped some local minimum parametric regionsduring execution and thus may give unreliable results, while STARLIGHT canstill give reliable results. Based on the fitting results of LRGs, we furtheranalyse their star formation history (SFH) and the relation between their ageand velocity dispersion, and find that those highly agrees with conclusionsfrom others' previous work.

On the Full Spectrum Fitting of Luminous Red Galaxies by Using ULySS and STARLIGHT