Reliable random error estimation in the measurement of line-strength indices

Preprint

12 June 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/9706116

Abstract

We present a new set of accurate formulae for the computation of random errors in the measurement of atomic and molecular indices. The new expressions are in excellent agreement with numerical simulations. We have found that, in some cases, the use of approximated equations can give misleading line-strength index errors. It is important to note that accurate errors can only be achieved after a full control of the error propagation throughout the data reduction with a parallel processing of data and error frames. Finally, simple recipes for the estimation of the required signal-to-noise ratio to achieve a fixed index error are presented.

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Version 1, 1997-06-12, ArXiv
Published version: Astronomy and Astrophysics Supplement Series, 127 (3), 597.

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