RT Journal Article
T1 Empirical calibration of the λ4000 Å break
A1 Gorgas García, Francisco Javier
A1 Cardiel López, Nicolás
A1 Pedraz, S.
A1 González, J. J.
AB 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.
PB EDP Sciences
SN 0365-0138
YR 1999
FD 1999-10
LK https://hdl.handle.net/20.500.14352/59918
UL https://hdl.handle.net/20.500.14352/59918
LA eng
NO 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.
NO Programa Sectorial de Promoción del Conocimiento (MEC)
NO Ministerio de Cultura (MEC), España
DS Docta Complutense
RD 8 abr 2025