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Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2014 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 569, A111- p.Article in journal (Refereed) Published
Abstract [en]

Context. An increasing number of high-resolution stellar spectra is available today thanks to many past and ongoing extensive spectroscopic surveys. Consequently, the scientific community needs automatic procedures to derive atmospheric parameters and individual element abundances. Aims. Based on the widely known SPECTRUM code by R.O. Gray, we developed an integrated spectroscopic software framework suitable for the determination of atmospheric parameters (i.e., effective temperature, surface gravity, metallicity) and individual chemical abundances. The code, named iSpec and freely distributed, is written mainly in Python and can be used on different platforms. Methods. iSpec can derive atmospheric parameters by using the synthetic spectral fitting technique and the equivalent width method. We validated the performance of both approaches by developing two different pipelines and analyzing the Gaia FGK benchmark stars spectral library. The analysis was complemented with several tests designed to assess other aspects, such as the interpolation of model atmospheres and the performance with lower quality spectra. Results. We provide a code ready to perform automatic stellar spectral analysis. We successfully assessed the results obtained for FGK stars with high-resolution and high signal-to-noise spectra.

Place, publisher, year, edition, pages
2014. Vol. 569, A111- p.
Keyword [en]
stars: atmospheres, stars: abundances, methods: data analysis
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-237622DOI: 10.1051/0004-6361/201423945ISI: 000343092100077OAI: oai:DiVA.org:uu-237622DiVA: diva2:770033
Available from: 2014-12-09 Created: 2014-12-03 Last updated: 2014-12-09Bibliographically approved

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Heiter, Ulrike
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