GMOS Calibration to the Lick Index System

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

In studies of unresolved stellar populations, age and metallicity are often the two most sought after quantities of interest. By comparing the stellar absorption features of unresolved systems to those of the Lick standard stars, ages and metallicities of the underlying stellar populations can be determined. However, care must be taken in calibrating spectra to the Lick system, as the original Lick spectra were not flux calibrated. In order to properly calibrate unresolved spectra, it is necessary to observe many of the original Lick standard stars and derive offsets to the standard system. This project has collected and reduced all available Lick observations performed with the Gemini Multi-Object Spectrograph (GMOS). In addition, a new online database is being developed, in which the derived offsets and reduced spectra will eventually be available for download.

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