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A. E. Piatti

As seen in: Dialnet - Universidad de La Rioja, Astronomy and Astrophysics (A&A)
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Articles by A. E. Piatti

A new DDO calibration of effective temperature for evolved late-type stars

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By A. E. Piatti, J.J. Clariá
| Dialnet - Universidad de La Rioja
The necessity is shown of establishing a new DDO calibration of effective temperature for evolved G and K stars. After a previous careful selection of objects according to different criteria and reddening corrections, the DDO two-color diagrams are redefined with normal lines for dwarfs, giants, and supergiants. Mean values of the DDO indices for every spectral type and luminosity class are derived.
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New DDO abundance calibrations for population I and II red giants: application to the study of chemical evolution of the disk

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By A. E. Piatti, D. Minniti, J.J. Clariá
| Dialnet - Universidad de La Rioja
Using new DDO data and abundances derived from high dispersion spectroscopy of G and K giants, new DDO abundance calibrations for population 1 and II giants are established. The relation between cyanogen anomaly and [Fe/H] is redefined for the —0.8 < [Fe/H] < +0.3 range. The blanketing vectors in the DDO two-color diagrams and a new abundance index §4548, which is well correlated ([Fe/H] = —3.0), are determined. For the first time isoabundance lines in the DDO two-color diagrams are presented.
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