Empirical calibration of the λ4000 Åbreak

Details Empirical calibration of the λ4000 Åbreak Empirical calibration of the λ4000 Åbreak

1999-05-20

arxiv.org/abs/astro-ph/9905264v1

Astronomy and Astrophysics

Astrophysics

21 pages including 7 postscript figures. Accepted for publication in Astronomy in Astrophysics Supplement Series. Table 1 will

Scientific paper

10.1051/aas:1999375

Empirical fitting functions, describing the behaviour of the \lambda 4000 \AA 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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