Empirical calibration of the λ4000 Å break
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1999
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EDP Sciences
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Abstract
Empirical fitting functions, describing the behaviour of the λ4000 Å break, D_4000, in terms of effective temperature, metallicity and surface gravity, are presented. For this purpose, the break has been measured in 392 stars from the Lick/IDS Library. We have followed a very detailed error treatment in the reduction and fitting procedures, allowing for a reliable estimation of the break uncertainties. This calibration can be easily incorporated into stellar population models to provide accurate predictions of the break amplitude for, relatively old, composite systems.
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Copyright The European Southern Observatory (ESO).
We thank Jesús Gallego (runs 3 and 5) and Jaime Zamorano (run 3) for carrying out the observations of some stars of the sample. We also thank Emilios Harlaftis, Martín Guerrero and Reynier Peletier, the support astronomers who performed the service time observations of runs 7, 10 and 12, respectively. We are grateful to the anonymous referee for useful suggestions. The JKT, INT and WHT are operated on the island of La Palma by the Royal Greenwich Observatory at the Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. The Calar Alto Observatory is operated jointly by the Max-Planck-Institute für Astronomie, Heidelberg, and the Spanish Comisión Nacional de Astronomía. This research has made use of the Simbad database (operated at CDS, Strasbourg, France), the NASA’s Astrophysics Data System Article Service, and the Hipparcos Catalogue. This work was supported by the Spanish “Programa Sectorial de Promoción del Conocimiento” under grant No. PB96-610.