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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/32530
Title: TOPoS. III. An ultra iron-poor multiple CEMP system
Authors: Caffau, E.
Bonifacio, P.
Spite, M.
Spite, F.
Monaco, L.
Sbordone, L.
François, P.
Gallagher, A. J.
Plez, B.
ZAGGIA, Simone 
Ludwig, H. -G.
Cayrel, R.
Koch, A.
Steffen, M.
Salvadori, S.
Klessen, R.
Glover, S.
Christlieb, N.
Issue Date: 2016
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 595
First Page: L6
Abstract: Aims: One of the primary objectives of the TOPoS survey is to search for the most metal-poor stars. Our search has led to the discovery of one of the most iron-poor objects known, SDSS J092912.32+023817.0. This object is a multiple system, in which two components are clearly detected in the spectrum. Methods: We have analysed 16 high-resolution spectra obtained using the UVES spectrograph at the ESO 8.2 m VLT telescope to measure radial velocities and determine the chemical composition of the system. Results: Cross correlation of the spectra with a synthetic template yields a double-peaked cross-correlation function (CCF) for eight spectra, and in one case there is evidence for the presence of a third peak. Chemical analysis of the spectrum obtained by averaging all the spectra for which the CCF showed a single peak found that the iron abundance is [Fe/H] = -4.97. The system is also carbon enhanced with [C/Fe] = +3.91 (A(C) = 7.44). From the permitted oxygen triplet we determined an upper limit for oxygen of [O/Fe] < +3.52 such that C/O > 1.3. We are also able to provide more stringent upper limits on the Sr and Ba abundances ([Sr/Fe] < +0.70, and [Ba/Fe] < +1.46, respectively). Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 094.D-0488 and 096.D-0616.
URI: http://hdl.handle.net/20.500.12386/32530
URL: https://www.aanda.org/articles/aa/full_html/2016/11/aa29776-16/aa29776-16.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201629776
Bibcode ADS: 2016A&A...595L...6C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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