J/A+A/641/A135 Sgr dSph CEMP-r/s star abundance analysis (Sbordone+, 2020)
A wide angle view of the Sagittarius dwarf spheroidal galaxy.
II. A CEMP-r/s star in the Sagittarius dwarf spheroidal galaxy.
Sbordone L., Hansen C.J., Monaco L., Cristallo S., Bonifacio P., Caffau E.,
Villanova S., Amigo P.
<Astron. Astrophys. 641, A135 (2020)>
=2020A&A...641A.135S 2020A&A...641A.135S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, peculiar ; Abundances ; Equivalent widths; Line Profiles
Keywords: galaxies: abundances - galaxies: individual: Sgr dSph -
Galaxy: abundances - stars: abundances - stars: chemically peculiar
Abstract:
We report on the discovery and chemical abundance analysis of the
first CEMP-r/s star detected in the Sagittarius dwarf spheroidal
galaxy (Sgr dSph) by means of UVES high-resolution spectra. The star,
found in the outskirts of Sgr dSph, along the major axis of the main
body, is a moderately metal-poor giant (Teff=4753K, logg=1.75,
[Fe/H]=-1.55) with [C/Fe]=1.13, placing it in the so-called
"high-carbon band", and strong s-process and r-process enrichment
([Ba/Fe]=1.4, [Eu/Fe]=1.01). Abundances of 29 elements from C to Dy
were obtained. The chemical pattern appears to be best fitted by a
scenario where an r-process pollution event pre-enriched the material
out of which the star was born as secondary in a binary system whose
primary evolved through the AGB phase, providing C- and s-process
enrichment.
Description:
These two tables contain the results relative to the fitting of all
the individual spectral features fitted with the MyGIsFOS and
FitProfile automatic codes. The "alllines.dat" table contains the
feature characteristics (e.g. ion abundance fitted through the
feature, starting and ending wavelength...), the fitting results (e.g.
the derived abundance) and a star and feature identifiers.The second
table (allsynth.dat) contain the detailed observed and fitted profiles
for each feature. Each line contains the star and feature identifiers,
the wavelength of that specific "pixel" and the corresponding observed
and fitted normalized fluxes.
Objects:
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RA (2000) DE Designation(s)
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19 07 34.34 -31 51 02.05 GIU J190734.24-315102.1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
alllines.dat 118 112 Per-feature fit results
allsynth.dat 61 4817 Feature observed and best-fitting profiles
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See also:
J/A+A/513/A62 : Sgr dSph VIMOS phot. & radial velocities (Giuffrida+, 2010)
Byte-by-byte Description of file: alllines.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Star [J190734.24-315102.1] Star ID
24- 25 A2 --- El Element name
27- 28 I2 --- Atnum Atomic number (1)
30- 31 I2 --- Ion Ionization state (1)(2)
33- 40 F8.4 nm Wini Starting wavelength of fitted feature
42- 49 F8.4 nm Wend Ending wavelength of fitted feature
53- 58 F6.3 --- [X/H] Abundance of the element in [X/H] format
62- 67 F6.3 pm EW Equivalent width of the best fitting synth (3)
69- 74 F6.3 pm OEW Equivalent width of the observed feature (3)
78- 82 F5.1 --- S/N Signal-to-noise ratio at feature center
86- 91 F6.2 km/s Shift Doppler shift applied to the feature
93- 98 F6.4 --- Cont Feature continuum renormalization
102 I1 --- VTuse Flag for use in Vt determination (4)
104 I1 --- Tuse Flag for use in Teff determination (5)
108-118 A11 --- Feat Feature ID (6)
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Note (1): Indicates the element the features are used to measure, but might
correspond to a molecular feature, for instance all the 07 00 are
CN features used to measure N abundances.
Note (2): 00 = neutral, 01 = one time ionized etc.
Note (3): For the CH g-band, EW and OEW would be meaningless due to the very
wide range synthesized, and have been put to -9.999.
Note (4): If VTuse = 1, the feature has been used in determining the slope of
the EW - Abundance relation used to set Microturbulence (meaningful only for
Fe I features).
Note (5): If Tuse = 1, the feature has used to determined the LEAS used in
estimating effective temperature (meaningful only for Fe I features).
Note (6): Composed of At_num, Ion and central wavelength multiplied by 1000 and
truncated.
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Byte-by-byte Description of file: allsynth.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Star [J190734.24-315102.1] Star ID
22- 32 A11 --- Feat Feature ID
36- 45 F10.6 nm Wave Wavelength
48- 53 F6.4 --- Synth Best-fitting synthetic normalized flux (1)
56- 61 F6.4 --- Obs Observed normalized flux
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Note (1): To overplot the best fitting synthetic over the observed spectrum,
synth must be DIVIDED by the 'Cont' continuum renormalization given in
the alllines.dat table for the feature.
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Acknowledgements:
Luca Sbordone, lsbordon(at)eso.org
References:
Giuffrida et al., Paper I 2010A&A...513A..62G 2010A&A...513A..62G, Cat. J/A+A/513/A62
(End) Luca Sbordone [ESO, Chile], Patricia Vannier [CDS] 02-Jul-2020