On the quality of stellar atmosphere parameters and abundances derived from spectroscopy

Details On the quality of stellar atmosphere parameters and abundances derived from spectroscopy On the quality of stellar atmosphere parameters and abundances derived from spectroscopy

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008coska..38..457s&link_type=abstract

Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2, p. 457-458.

Astronomy and Astrophysics

Astronomy

Stars: Chemically Peculiar, Stars: Abundances, Techniques: Spectroscopic

Scientific paper

Abundance analyses are usually performed by empirical methods. The existing semi-automatic
software packages mostly are strongly dependent on an initial or fixed set of fundamental
parameters and the set of lines provided by the researcher. Furthermore the implemented
iterative process of fitting certain lines or regions of a star's spectrum often ignores the
parameters' physical meaning.
Thus, the accuracy of the derived results and moreover the comparibility of different
investigations are in many cases left to the researchers judgement. However, several attempts
to study how uncertainties in single fundamental or line parameters translate to the precision
of abundance determination have been successfully conducted.
We started to investigate the combined effect of variations in effective temperature, surface gravity,
microturbulence, line blending, metallicity (i.e. abundance pattern) together with the number of atomic
lines used.
Our aim is to be able to make quantitative statements on this general uncertainty in abundance analysis
and to define a way to automate determination of fundamental parameters
and element abundances whilst:
providing a traceable measure of accuracy for the results;
being not restricted to a certain instrument, resolution or object;
minimizing the effort of preparation.

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