J/A+A/573/A67 Fundamental stellar parameters from PolarBase (Paletou+, 2015)
Inversion of stellar fundamental parameters from ESPaDOnS and Narval
high-resolution spectra.
Paletou F., Boehm T., Watson V., Trouilhet J.-F.
<Astron. Astrophys., 573, A67-67 (2015)>
=2015A&A...573A..67P 2015A&A...573A..67P
ADC_Keywords: Stars, fundamental ; Spectroscopy ; Effective temperatures ;
Abundances, [Fe/H]
Keywords: astronomical databases: miscellaneous - methods: data analysis -
stars: fundamental parameters
Abstract:
The general context of this study is the inversion of stellar
fundamental parameters from high-resolution Echelle spectra. We aim at
developing a fast and reliable tool for the post-processing of spectra
produced by ESPaDOnS and Narval spectropolarimeters. Our inversion
tool relies on principal component analysis. It allows reducing
dimensionality and defining a specific metric for the search of
nearest neighbours between an observed spectrum and a set of observed
spectra taken from the Elodie stellar library. Effective temperature,
surface gravity, total metallicity, and projected rotational velocity
are derived. Various tests presented in this study that were based
solely on information coming from a spectral band centred on the Mgi
b-triplet and had spectra from FGK stars are very promising.
Description:
Our reference spectra are taken from the Elodie stellar library
(Prugniel et al. 2007, 0703658, Cat. III/251; Prugniel &
Soubiran 2001A&A...369.1048P 2001A&A...369.1048P, Cat. III/218).
Our main purpose is inverting of stellar parameters from
high-resolution spectra coming from Narval and ESPaDOnS
spectropolarimeters. These data are now available from the public
database PolarBase (Petit et al., 2014PASP..126..469P 2014PASP..126..469P, Cat.
J/PASP/126/469). Narval is a modern spectropolarimeter operating in
the 380-1000nm spectral domain, with a spectral resolution of
65000 in its polarimetric mode. It is an improved copy, adapted to
the 2m TBL telescope, of the ESPaDOnS spectropolarimeter, which is in
operations since 2004 at the 3.6m aperture CFHT telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 41 140 Values and uncertainties of the inverted stellar
parameters Teff, logg, and [Fe/H] for objects of
Valenti & Fischer 2005 (J/ApJS/159/141) in common
with PolarBase using our Elodie-based PCA method
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See also:
J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)
III/251 : ELODIE library V3.1 (Prugniel+ 2007)
J/PASP/126/469 : PolarBase catalogue of stellar spectra (Petit+, 2014)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
13- 16 I4 K Teff Effective temperature
18- 20 I3 K e_Teff rms uncertainty on Teff
22- 25 F4.2 [cm/s2] logg Surface gravity
27- 30 F4.2 [cm/s2] e_logg rms uncertainty on logg
32- 36 F5.2 [Sun] [Fe/H] [-0.82/0.34] Metallicity
38- 41 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H]
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Feb-2015