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Date and Time of the Query: 2019-05-26 T06:41:49 PDT
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For refcode 2005AJ....130.2666P:
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Copyright by American Astronomical Society. Reproduced by permission
2005AJ....130.2666P A New Definition for the Ca4227 Feature: Is Calcium Really Underabundant in Early-Type Galaxies? L. C. Prochaska, James A. Rose, and Ricardo P. Schiavon Abstract. We have investigated the abundance of calcium in early-type galaxies by measuring the strength of the Ca I {lambda}4227 absorption line in their integrated spectra. The database used is the large sample of early-type galaxy integrated spectra in Caldwell and coworkers. We have measured Ca abundances from the Ca I {lambda}4227 feature both by using the Lick Ca4227 index and by defining a new index, Ca4227_r_, that avoids the CN4216 molecular band in the continuum on the blueward side of the line. With the new index definition we measure Ca abundances that are systematically ~0.3 dex higher than with the Lick Ca4227 index. The result is that with the new index definition we obtain higher [Ca/Fe] abundances in early-type galaxies, which are more consistent with their well-known [Mg/Fe] overabundances. Hence, we suggest that Ca might be slightly enhanced, relative to Fe, in early-type galaxies. Key words: Galaxies: Abundances, Galaxies: Evolution, Galaxies: Stellar Content
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