An empirical analysis of absorption features in synthetic spectra

Details An empirical analysis of absorption features in synthetic spectra An empirical analysis of absorption features in synthetic spectra

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..359m&link_type=abstract

The Astronomical Journal, vol. 107, no. 1, p. 359-366

Astronomy and Astrophysics

Astronomy

12

Absorption Spectra, Abundance, Iron, Metallicity, Open Clusters, Stellar Temperature, Astronomical Models, Astronomical Spectroscopy, Magnesium, Stellar Atmospheres, Stellar Gravitation

Scientific paper

We have computed synthetic spectra in a grid of temperature, surface gravity, (Fe/H), and (alpha/Fe) in order to investigate the sensitivity of the MgH and Mgb feature and of five Fe features in the region lambda lambda 4900-5500 to changes in model parameters. After convolving the spectra with a Gaussian in order to simulate the blend of features observed with medium resolution spectroscopy, we obtained an overall metallicity from each feature with the empirical calibrations of late-type stars by Friel & Janes (1993). We find that, on the whole, output metallicities accurately reflect differences in model (Fe/H), demonstrating that the calibration lines of Friel and Janes have accurately modeled index strength as a function of (B - V) and (Fe/H). The Mg feature and, to a lesser extent, the Fe features at 5335, 5011, and 5270 A are sensitive to surface gravity. The Mg feature is also quite sensitive to (alpha/Fe). These results, combined with systematic effects recently noted among observations of old open cluster giants, support the likelihood of varying (Mg/Fe) in the open cluster system.

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