Bibcode
Allende Prieto, C.
Bibliographical reference
Astronomische Nachrichten, Vol.325, Issue 6, p.604-609
Advertised on:
10
2004
Citations
36
Refereed citations
32
Description
Classical model-atmosphere analyses of stellar spectra usually begin by
measuring equivalent widths, and then proceed into a loop in which 1)
model spectra are calculated for a set of abundances and atmospheric
parameters, and 2) observed and computed spectra are compared and
corrections to the abundances and parameters are inferred. Automated
techniques have been developed to automate the measurement of equivalent
widths, and some or all parts in the analysis loop. However, in order to
tackle the massive datasets provided by the new spectroscopic surveys
with dedicated telescopes, it is necessary to make some radical changes.
It is argued that future analyses of stellar spectra should abandon the
use of equivalent widths, and rely on tables of synthetic spectra that
can be either interpolated extremely fast in minimum-distance
optimization methods or used for training genetic algorithms. Examples
of ongoing projects involving high-dispersion stellar spectra for a
small sample and low-dispersion spectra for a sample of tens of
thousands of stars are described.