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A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)

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arxiv astro-ph/0703696 v2 pith:6KYCKU5G submitted 2007-03-27 astro-ph

A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)

S. G. Sousa (1 , 2 , 6) , N. C. Santos (1 , 3 , 4) , G. Israelian (5) , M. Mayor (3)
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M. J. P. F. G. Monteiro (2 6) ((1) - Centro de Astronomia e Astrofisica da Universidade de Lisboa Observatorio Astronomico de Lisboa Lisbon Portugal; (2) - Centro de Astrofisica da Universidade do Porto Porto Portugal; (3) - Observatoire de Geneve Sauverny Switzerland; (4) - Centro de Geofisica de Evora Evora Portugal; (5) - Instituto de Astrofisica de Canarias La Laguna Tenerife Spain; (6) - Departamento de Matematica Aplicada Faculdade de Ciencias da Universidade do Porto Portugal)
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We present a new automatic code (ARES) for determining equivalent widths of the absorption lines present in stellar spectra. We also describe its use for determining fundamental spectroscopic stellar parameters. The code is written in C++ based on the standard method of determining EWs and is available for the community. The code automates the manual procedure that the users normally carry out when using interactive routines such as the splot routine implemented in IRAF. We test the code using both simulated and real spectra with different levels of resolution and noise and comparing its measurements to the manual ones obtained in the standard way. The results shows a small systematic difference, always below 1.5m\AA. This can be explained by errors in the manual measurements caused by subjective continuum determination. The code works better and faster than others tested before.

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