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Gaia spectroscopy overview and comparative spectrum modeling for cool giants
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
2011 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 328, no Conference 1, 012001- p.Article in journal (Refereed) Published
Abstract [en]

The Gaia mission will provide spectroscopic and spectrophotometric observations for a vast number of stars, allowing a characterization in terms of stellar parameters along with the astrometric measurements. The pipeline for astrophysical parameter determination relies on libraries of model spectra for mapping stellar parameters to flux distributions. To maximize the reliability of the parametrization, adequate efforts are required to assess the realism of the model spectra and to calibrate the analysis methods. We describe a spectrum modelling experiment, in which high-resolution optical and infrared spectra of four cool giant stars were analysed by 14 different groups. The resulting variance in derived stellar parameters illustrates the need to be cautious when comparing or combining stellar parameters from different model atmospheres and analysis strategies. The main causes for the differences in parameters derived by different groups seem to lie in the physical input data and in the details of the analysis method.

Place, publisher, year, edition, pages
2011. Vol. 328, no Conference 1, 012001- p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-170167DOI: 10.1088/1742-6596/328/1/012001ISI: 000300169400001OAI: oai:DiVA.org:uu-170167DiVA: diva2:508581
GREAT-ESF Workshop on Stellar Atmospheres in the Gaia Era - Quantitative Spectroscopy and Comparative Spectrum Modelling, Brussels, Belgium, Jun 23-24 2011
Available from: 2012-03-09 Created: 2012-03-09 Last updated: 2012-10-11Bibliographically approved

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Heiter, Ulrike
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