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Preprint 02/09

Software for the Spectral Analysis of Hot Stars

Thomas Rauch (1), Iliya Nickelt (2), Ulrike Stampa (3), Markus Demleitner (3), Lars Koesterke (4)

(1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1,72076 Tübingen, Germany
(2) Astrophysical Institute Potsdam, Department of E-Science, An der Sternwarte 16, 14482 Potsdam, Germany
(3) Astronomisches Rechen-Institut, Mönchhofstra\ss e 12-14, 69120 Heidelberg, Germany
(4) Texas Advanced Computer Center, University of Texas, 10100 Burnet Road (R8700), Austin,Texas 78758-4497, USA

To be published in: Proceedings of ADASS XVIII

Abstract. In a collaboration of the German Astrophysical Virtual Observatory (GAVO) and AstroGrid-D, the German Astronomy Community Grid (GACG), we provide a VO service for the access and the calculation of stellar synthetic energy distributions (SEDs) based on static as well as expanding non-LTE model atmospheres.
At three levels, a VO user may directly compare observed and theoretical SEDs: The easiest and fastest way is to use pre-calculated SEDs from the GAVO database. For individual objects, grids of model atmospheres and SEDs can be calculated on the compute resources of AstroGrid-D within reasonable wallclock time. Experienced VO users may even create own atomic-data files for a more detailed analysis.
This VO service opens also the perspective for a new approach to an automated spectral analysis of a large number of observations, e.g. provided by multi-object spectrographs.
Key words: stars: atmospheres, virtual observatory

Preprint (178 kb PDF file including figures)

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