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ATLAS 9 and ATLAS 12 under GNU-Linux

Published online by Cambridge University Press:  01 August 2006

Luca Sbordone ,
Piercarlo Bonifacio  and
Fiorella Castelli
Luca Sbordone
Affiliation:
CIFIST Marie Curie Excellence Team Observatoire de Paris, GEPI 5, place Jules Janssen, 92195 Meudon, France email: [email protected]
Piercarlo Bonifacio
Affiliation:
CIFIST Marie Curie Excellence Team Observatoire de Paris, GEPI 5, place Jules Janssen, 92195 Meudon, France email: [email protected] INAF – Osservatorio Astronomico di Trieste via G. B. Tiepolo 11, 34131 Trieste, Italy
Fiorella Castelli
Affiliation:
INAF – Osservatorio Astronomico di Trieste via G. B. Tiepolo 11, 34131 Trieste, Italy
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Abstract

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We successfully ported the suite of codes developed by R. L. Kurucz for stellar atmosphere modelling, abundance determination and synthetic spectra calculation, to run under GNU-Linux. The ported codes include ATLAS 9 and ATLAS 12 for 1-D plane-parallel atmosphere model calculation, DFSYNTHE, which calculates the Opacity Distribution Functions (ODF) to be used with ATLAS 9, WIDTH to derive chemical abundances from measured line Equivalent Widths (EW) and SYNTHE to calculate synthetic spectra. The codes input and output files remain fully compatible with the VMS versions, while the computation speed has been greatly increased due to the high efficiency of modern PC CPUs. As an example, ATLAS 9 model calculations and the computation of large (e.g. 10 nm) synthetic spectra can be executed in a matter of minutes on any mainstream laptop computer. Arbitrary chemical compositions can be used in calculations (by using ATLAS 12 through opacity sampling or by calculating ad-hoc ODFs for ATLAS 9). The large set of scripting languages existing under Linux (shell, perl, python. . .) and the availability of low-cost multiprocessor Linux architectures (such as Beowulf) makes the port highly effective to build model farms to produce large quantities of atmosphere models or synthetic spectra (e.g. for the production of integrated light synthetic spectra). The port is hosted on a dedicated website including a download section for source codes, precompiled binaries, needed data (opacities, line lists and so on), sample launch scripts and documentation.

Keywords

Stars: atmospheresstars: abundancesline: formationline: identificationline: profilesconvection
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 71 - 73
Copyright
Copyright © International Astronomical Union 2007

References

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Sbordone, L. 2005, MSAIS 8, 61 (2005)Google Scholar
Sbordone, L., Bonifacio, P., Castelli, F., & Kurucz, R. L. 2004, MSAIS 5, 93Google Scholar