J/A+A/710/A132 Line list (Caffau+, 2026)
TYC 170-1218-1: A new r-process enhanced extremely metal-poor star, rich in Th.
Caffau E., Bonifacio P., Sbordone L., Monaco L., Alazzawi J., Spite M.,
Francois P., Mucciarelli A.
<Astron. Astrophys. 710, A132 (2026)>
=2026A&A...710A.132C 2026A&A...710A.132C
ADC_Keywords: Atomic physics
Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances -
stars: Population II - Galaxy: abundances - Galaxy: formation -
Galaxy: halo
Abstract:
Extremely metal-poor (EMP) stars are formed from gas clouds enriched
by one or a few supernova explosions belonging to the first stellar
generation and this very limited number of sources of metal enrichment
is suitable to produce peculiar chemical patterns that give birth to
stars with anomalous chemical composition. Among the EMP stars, r-II
stars are characterised by an over-abundance of the heavy elements
with respect to iron.
In the search for apparently young, metal-poor stars, we
serendipitously selected TYC 170-1218-1, which turned out to be an EMP
star, enhanced in neutron capture elements over iron. Our aim is to
obtain a detailed chemical inventory for this exceptional object.
We investigated high-resolution spectra observed with UVES at the VLT
telescope and Mike at the Magellan Clay telescope. We derived the
abundance of 33 elements using the MyGIsFOS code and an ATLAS 9 model
atmosphere.
The star is an EMP with [Fe/H]=-3.52. It is enhanced in the alpha
elements, as EMP stars usually are. It is an r-II star with
[Eu/Fe]=+1.84 and [Th/Fe]=+1.85. The star is also poor in carbon with
respect to iron. The quality of the spectra was insufficient for us to
detect uranium. Kinematically the star belongs now to the Galactic
halo, but it joined the Milky Way during the Sequoia accretion event.
Description:
The paper analysed the star TYC 170-1218-1: an EMP, r-II star rich in
Th. Line list used in the paper.
Objects:
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RA (2000) DE Designation(s)
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07 06 26.39 +04 27 41.0 TYC 170-1218-1 = TIC 292072365
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
linelist.dat 29 1284 Line list
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Byte-by-byte Description of file: linelist.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- El Element
4- 5 I2 --- Z Atomic number
7 I1 --- Ion Ionisation state
9- 16 F8.4 nm lambda Wavelength
18- 23 F6.3 --- loggf Oscillator strength
25- 29 F5.3 eV Elow Lower energy
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Acknowledgements:
Elisabetta Caffau, Elisabetta.Caffau(at)obspm.fr
License: CC-BY-4.0
(End) Patricia Vannier [CDS] 28-Apr-2026