Empirical calibration of the λ4000 Åbreak

Preprint

20 May 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/9905264

Abstract

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.

Keywords

EMPIRICAL CALIBRATION
FITTING FUNCTIONS
EMPIRICAL FITTING
COMPOSITE SYSTEMS
BREAK EMPIRICAL
UNCERTAINTIES
RELIABLE
GRAVITY

All Related Versions

Version 1, 1999-05-20, ArXiv
Published version: Astronomy and Astrophysics Supplement Series, 139 (1), 29.

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