Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21361201m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #612.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results on the calibration of Gemini GMOS spectra to the Lick line index system. The Lick system of spectral line indices is one of the most commonly used methods of determining ages and metallicities of unresolved (integrated light) spectral populations. However, care must be taken to calibrate the measured indices to the standard system before making comparisons with models. The calibration of the Lick/IDS system is complicated because the original Lick spectra were not flux calibrated, so there are usually systematic effects due to differences in continuum shape. In addition, the spectra must be broadened to the Lick spectral resolution. Proper calibration involves observing many of the original Lick/IDS standard stars and deriving offsets to the standard system. The indices of the standard stars must bracket the expected indices of the science targets, so many stars may be needed if a wide range of metallicities or ages is expected. We have observed several dozen Lick standard stars with GMOS North and South on the Gemini telescopes and we present details on the data reduction and the initial calibration to the Lick system.
Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).
Miller Bryan W.
Puzia Thomas
Trancho Gelys
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