J/A+A/587/A2 SP_Ace derived data from stellar spectra (Boeche+, 2016)
SP_Ace: a new code to derive stellar parameters and elemental abundances.
Boeche C., Grebel E.K.
<Astron. Astrophys. 587, A2 (2016)>
=2016A&A...587A...2B 2016A&A...587A...2B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, fundamental ; Abundances
Keywords: methods: data analysis - atomic data - stars: fundamental parameters -
stars: abundances - techniques: spectroscopic - surveys
Abstract:
Ongoing and future massive spectroscopic surveys will collect large
numbers (106-107) of stellar spectra that need to be analyzed.
Highly automated software is needed to derive stellar parameters and
chemical abundances from these spectra.
We developed a new method of estimating the stellar parameters Teff,
logg, [M/H], and elemental abundances. This method was implemented
in a new code, SP_Ace (Stellar Parameters And Chemical abundances
Estimator). This is a highly automated code suitable for analyzing the
spectra of large spectroscopic surveys with low or medium spectral
resolution (R=2000-20000).
After the astrophysical calibration of the oscillator strengths of
4643 absorption lines covering the wavelength ranges 5212-6860Å and
8400-8924Å, we constructed a library that contains the equivalent
widths (EW) of these lines for a grid of stellar parameters. The EWs
of each line are fit by a polynomial function that describes the EW of
the line as a function of the stellar parameters. The coefficients of
these polynomial functions are stored in a library called the "GCOG
library". SP_Ace, a code written in FORTRAN95, uses the GCOG library
to compute the EWs of the lines, constructs models of spectra as a
function of the stellar parameters and abundances, and searches for
the model that minimizes the χ2 deviation when compared to the
observed spectrum. The code has been tested on synthetic and real
spectra for a wide range of signal-to-noise and spectral resolutions.
Description:
SP_Ace is a software designed to derive stellar parameters and
elemental abundances from stellar spectra. In this tables we report
the stellar parameters Teff, logg, [M/H], and chemical abundances
[El/H] for ten elements derived with the software SP_Ace from spectra
of the ELODIE spectral library (Prugniel et al., 2007, Cat. III/251),
the benchmark stars (Jofre et al., 2014, Cat. J/A+A/564/A133), and the
S4N library (Allende Prieto et al., 2004, Cat. J/A+A/420/183) degraded
to spectral resolution R=12,000 and S/N=100.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tabled1.dat 295 1386 ELODIE spectral library
tabled2.dat 295 31 Benchmark stars spectra
tabled3.dat 295 110 S4N stars spectra
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See also:
III/251 : ELODIE library V3.1 (Prugniel+ 2007)
J/A+A/420/183 : Solar neighborhood spectroscopic survey (Allende Prieto+ 2004)
J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)
Byte-by-byte Description of file: tabled1.dat tabled2.dat tabled3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- sp Spectrum designation (Star name or number)
15- 18 I4 K Teff Effective Temperature
21- 24 I4 K e_Teff ?=-10 Teff confidence interval lower limit
27- 30 I4 K E_Teff ?=-10 Teff confidence interval upper limit
32- 35 F4.2 [cm/s2] logg Logarithm of gravity
38- 41 F4.2 [cm/s2] e_logg ?=-9.99 log g confidence interval lower limit
44- 47 F4.2 [cm/s2] E_logg ?=-9.99 log g confidence interval upper limit
49- 53 F5.2 [Sun] [M/H] Metallicity
56- 59 F4.2 [Sun] e_[M/H] ?=-9.99 [M/H] confidence interval lower limit
62- 65 F4.2 [Sun] E_[M/H] ?=-9.99 [M/H] confidence interval upper limit
67- 71 F5.2 [Sun] [Fe/H] ?=-9.99 Iron abundance relative to the Sun
74- 77 F4.2 [Sun] e_[Fe/H] ?=-9.99 [Fe/H] confidence interval lower limit
80- 83 F4.2 [Sun] E_[Fe/H] ?=-9.99 [Fe/H] confidence interval upper limit
85- 88 I4 --- NFe Number of lines used for the [Fe/H] estimation
90- 94 F5.2 [Sun] [Mg/H] ?=-9.99 Magnesium abundance relative to the Sun
97-100 F4.2 [Sun] e_[Mg/H] ?=-9.99 [Mg/H] confidence interval lower limit
103-106 F4.2 [Sun] E_[Mg/H] ?=-9.99 [Mg/H] confidence interval upper limit
108-111 I4 --- NMg Number of lines used for the [Mg/H] estimation
113-117 F5.2 [Sun] [Si/H] ?=-9.99 Silicon abundance relative to the Sun
120-123 F4.2 [Sun] e_[Si/H] ?=-9.99 [Si/H] confidence interval lower limit
126-129 F4.2 [Sun] E_[Si/H] ?=-9.99 [Si/H] confidence interval upper limit
131-134 I4 --- NSi Number of lines used for the [Si/H] estimation
136-140 F5.2 [Sun] [Ca/H] ?=-9.99 Calcium abundance relative to the Sun
143-146 F4.2 [Sun] e_[Ca/H] ?=-9.99 [Ca/H] confidence interval lower limit
149-152 F4.2 [Sun] E_[Ca/H] ?=-9.99 [Ca/H] confidence interval upper limit
154-157 I4 --- NCa Number of lines used for the [Ca/H] estimation
159-163 F5.2 [Sun] [Sc/H] ?=-9.99 Scandium abundance relative to the Sun
166-169 F4.2 [Sun] e_[Sc/H] ?=-9.99 [Sc/H] confidence interval lower limit
172-175 F4.2 [Sun] E_[Sc/H] ?=-9.99 [Sc/H] confidence interval upper limit
177-180 I4 --- NSc Number of lines used for the [Sc/H] estimation
182-186 F5.2 [Sun] [Ti/H] ?=-9.99 Titanum abundance relative to the Sun
189-192 F4.2 [Sun] e_[Ti/H] ?=-9.99 [Ti/H] confidence interval lower limit
195-198 F4.2 [Sun] E_[Ti/H] ?=-9.99 [Ti/H] confidence interval upper limit
200-203 I4 --- NTi Number of lines used for the [Ti/H] estimation
205-209 F5.2 [Sun] [V/H] ?=-9.99 Vanadium abundance relative to the Sun
212-215 F4.2 [Sun] e_[V/H] ?=-9.99 [V/H] confidence interval lower limit
218-221 F4.2 [Sun] E_[V/H] ?=-9.99 [V/H] confidence interval upper limit
223-226 I4 --- NV Number of lines used for the [V/H] estimation
228-232 F5.2 [Sun] [Cr/H] ?=-9.99 Chromium abundance relative to the Sun
235-238 F4.2 [Sun] e_[Cr/H] ?=-9.99 [Cr/H] confidence interval lower limit
241-244 F4.2 [Sun] E_[Cr/H] ?=-9.99 [Cr/H] confidence interval upper limit
246-249 I4 --- NCr Number of lines used for the [Cr/H] estimation
251-255 F5.2 [Sun] [Co/H] ?=-9.99 Cobalt abundance relative to the Sun
258-261 F4.2 [Sun] e_[Co/H] ?=-9.99 [Co/H] confidence interval lower limit
264-267 F4.2 [Sun] E_[Co/H] ?=-9.99 [Co/H] confidence interval upper limit
269-272 I4 --- NCo Number of lines used for the [Co/H] estimation
274-278 F5.2 [Sun] [Ni/H] ?=-9.99 Nickel abundance relative to the Sun
281-284 F4.2 [Sun] e_[Ni/H] ?=-9.99 [Ni/H] confidence interval lower limit
287-290 F4.2 [Sun] E_[Ni/H] ?=-9.99 [Ni/H] confidence interval upper limit
292-295 I4 --- NNi Number of lines used for the [Ni/H] estimation
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Acknowledgements:
Corrado Boeche, corrado(at)ari.uni-heidelberg.de
Astronomisches Rechen-Institut, Heidelberg
(End) Corrado Boeche [Heidelberg], Patricia Vannier [CDS] 02-Nov-2015