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

Autor(en)

Christian Stütz, Nicole Nesvacil, Luca Fossati, Denis Victorovich Shulyak

Abstrakt

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.

Organisation(en)

Institut für Astrophysik

Journal

Contributions of the Astronomical Observatory Skalnaté Pleso

Band

38

Seiten

457-458

Anzahl der Seiten

2

ISSN

1335-1842

Publikationsdatum

2008

ÖFOS 2012

1010 Mathematik, 1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f4a0308c-b8a0-4d6c-9d43-d8034f854fd2