J/A+A/554/A106 Abundance study of LMC post-AGB stars (van Aarle+, 2013)
Detailed abundance study of four s-process enriched post-AGB stars in the
Large Magellanic Cloud.
van Aarle E., Van Winckel H., De Smedt K., Kamath D., Wood P.R.
<Astron. Astrophys., 554, A106-106 (2013)>
=2013A&A...554A.106V 2013A&A...554A.106V
ADC_Keywords: Magellanic Clouds ; Abundances ; Spectroscopy
Keywords: stars: AGB and post-AGB - stars: evolution - Magellanic Clouds -
circumstellar matter - stars: abundances
Abstract:
The photospheric abundances of evolved solar-type stars of different
metallicities serve as probes into stellar evolution theory. Stellar
photospheres of post-asymptotic giant branch (post-AGB) stars bear
witness to the internal chemical enrichment processes, integrated over
their entire stellar evolution. Here we study post-AGB stars in the
Large Magellanic Cloud (LMC). With their known distances, these rare
objects are ideal tracers of AGB nucleosynthesis and dredge-up
phenomena.
Description:
We used the UVES spectrograph mounted on the Very Large Telescope
(VLT) at the European Southern Observatory (ESO), to obtain
high-resolution spectra with high signal-to-noise (S/N) of a sample of
four post-AGB stars of the Large Magellanic Cloud. The objects display
a spectral energy distribution (SED) that indicates the presence of
circumstellar dust. We perform a detailed abundance analysis on the
basis of these spectra. In the five catalogues, the detailed
line-lists are given. Every catalogue has the same layout: the
identification is given by the proton-number of the chemical element.
For lines coming from ionised lines, we add 0.1 to the proton number;
the wavelength is given in rest in air in Angstrom units; the
excitation potential (eV); the used oscillator strength; the measured
equivalent width (mÅ) finally the obtained abundance.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 84 5 Stars summary (added at CDS)
j050632.dat 45 310 Linelist of J050632.10-714229.8
j052043a.dat 45 208 Linelist of J052043.86-692341.0 spectrum A
j052043b.dat 45 240 Linelist of J052043.86-692341.0 spectrum B
j053250.dat 45 198 Linelist of J053250.69-713925.8
j053253.dat 45 233 Linelist of J053253.51-695915.1
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See also:
J/A+A/530/A90 : Optically bright post-AGB population of LMC (van Aarle+, 2011)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Abbreviated name (and name of table
with abundances)
11- 15 F5.1 km/s RV Heliocentric radial velocity
17- 19 F3.1 km/s e_RV Error on RV
22- 31 A10 --- --- [SSTISAGEMC]
33- 51 A19 --- SAGEMC Spitzer SAGE identification (Cat. II/305)
53- 56 I4 K Teff Effective temperature
58- 60 F3.1 [cm/s2] logg Gravity
62- 64 F3.1 km/s xi Microturbulence velocity ξ
66- 69 F4.1 [Sun] [Fe/H] Metallicity
71- 84 A14 --- SpType MK spectral classification
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Byte-by-byte Description of file: j*.dat
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Bytes Format Units Label Explanations
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1- 5 F5.1 --- Ion Identification:
Mass number+0.1*ionisation stage
7- 15 F9.3 0.1nm lambda Wavelength in rest frame (Å)
17- 23 F7.3 eV chi Excitation potential χ in eV
26- 31 F6.3 [-] logf Oscillator strength
33- 38 F6.1 0.1pm EW Equivalenth width (mÅ)
41- 45 F5.2 [-] A Obtained abundance
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Acknowledgements:
Hans Van Winckel, Hans.VanWinckel(at)ster.kuleuven.be
(End) Patricia Vannier [CDS] 18-Feb-2014