Tabernero, H. M.; Marfil, E.; Montes, D.; González Hernández, J. I.
Bibliographical reference
Astronomy and Astrophysics, Volume 628, id.A131, 12 pp.
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8
2019
Journal
Citations
33
Refereed citations
28
Description
Context. STEPAR is an automatic code written in Python 3.X designed to
compute the stellar atmospheric parameters Teff, log g,
[Fe/H], and ξ of FGK-type stars by means of the equivalent width (EW)
method. This code has already been extensively tested in different
spectroscopic studies of FGK-type stars with several spectrographs and
against thousands of Gaia-ESO Survey UVES U580 spectra of late-type,
low-mass stars as one of its 13 pipelines. Aims: We describe the
code that we tested against a library of well characterised Gaia
benchmark stars. We also release the code to the community and provide
the link for download. Methods: We carried out the required EW
determination of Fe I and Fe II spectral lines using the automatic tool
TAME. STEPAR implements a grid of MARCS model atmospheres and the MOOG
radiative transfer code to compute stellar atmospheric parameters by
means of a Downhill Simplex minimisation algorithm. Results: We
show the results of the benchmark star test and also discuss the
limitations of the EW method, and hence the code. In addition, we find a
small internal scatter for the benchmark stars of 9 ± 32 K in
Teff, 0.00 ± 0.07 dex in log g, and 0.00 ± 0.03
dex in [Fe/H]. Finally, we advise against using STEPAR on double-lined
spectroscopic binaries or spectra with R < 30 000, S/N < 20, or v
sin i > 15 km s-1, and on stars later than K4 or earlier
than F6.
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