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

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

1997-06-12

arxiv.org/abs/astro-ph/9706116v1

Astronomy and Astrophysics

Astrophysics

9 pages, LaTeX file + 5 PostScript figures, psfig.sty and laa-s.sty required, to be published in Astronomy & Astrophysics Supp

Scientific paper

10.1051/aas:1998123

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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