Low-resolution near-infrared SpeX spectra of 14 Cepheids recover global metallicities matching homogenized optical iron abundances with 0.09 dex scatter.
Barium Abundances in Cepheids
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abstract
We derived the barium atmospheric abundances for a large sample of Cepheids, comprising 270 stars. The sample covers a large range of galactocentric distances, from about 4 to 15 kpc, so that it is appropriated to investigate the existence of radial barium abundance gradients in the galactic disc. In fact, this is the first time that such a comprehensive analysis of the distribution of barium abundances in the galactic disc is carried out. As a result, we conclude that the Ba abundance distribution can be characterized by a zero gradient. This result is compared with derived gradients for other elements, and some reasons are briefly discussed for the independence of the barium abundances upon galactocentric distances.
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Cepheid metallicities from low-resolution near-infrared spectra: validation against the optical reference scale
Low-resolution near-infrared SpeX spectra of 14 Cepheids recover global metallicities matching homogenized optical iron abundances with 0.09 dex scatter.