A statistical method for the identification of stars enriched in neutron-capture elements from medium-resolution spectra
A statistical method for the identification of stars enriched in neutron-capture elements from medium-resolution spectra
We present an automated statistical method that uses medium-resolution spectroscopic observations of a set of stars to select those that show evidence of possessing significant amounts of neutron-capture elements. Our tool was tested against a sample of ∼70 000 F- and G-type stars distributed among 215 plates from the Galactic Understanding and Exploration (SEGUE) survey, including 13 that were directed at stellar Galaxy clusters. Focusing on five spectral lines of europium in the visible window, our procedure ranked the stars by their likelihood of having enhanced content of this atomic species and identifies the objects that exhibit signs of being rich in neutron-capture elements as those scoring in the upper 2.5%. We find that several of the cluster plates contain relatively large numbers of stars with significant absorption around at least three of the five selected lines. The most prominent is the globular cluster M 3, where we measured a fraction of stars that are potentially rich in heavy nuclides, representing at least 15%.
Navo, G.
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Tous Mayol, Jose Luis
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Solanes, J.M.
ff3ac2ff-f389-4060-892f-da1f712a632e
28 October 2019
Navo, G.
0bfc6267-ae76-460e-9836-51141b19baa6
Tous Mayol, Jose Luis
53e68ff4-8401-4d43-9ed2-f8b4c7b1fd53
Solanes, J.M.
ff3ac2ff-f389-4060-892f-da1f712a632e
Navo, G., Tous Mayol, Jose Luis and Solanes, J.M.
(2019)
A statistical method for the identification of stars enriched in neutron-capture elements from medium-resolution spectra.
Astronomy & Astrophysics, 631, [A93].
(doi:10.1051/0004-6361/201936324).
Abstract
We present an automated statistical method that uses medium-resolution spectroscopic observations of a set of stars to select those that show evidence of possessing significant amounts of neutron-capture elements. Our tool was tested against a sample of ∼70 000 F- and G-type stars distributed among 215 plates from the Galactic Understanding and Exploration (SEGUE) survey, including 13 that were directed at stellar Galaxy clusters. Focusing on five spectral lines of europium in the visible window, our procedure ranked the stars by their likelihood of having enhanced content of this atomic species and identifies the objects that exhibit signs of being rich in neutron-capture elements as those scoring in the upper 2.5%. We find that several of the cluster plates contain relatively large numbers of stars with significant absorption around at least three of the five selected lines. The most prominent is the globular cluster M 3, where we measured a fraction of stars that are potentially rich in heavy nuclides, representing at least 15%.
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Accepted/In Press date: 24 September 2019
Published date: 28 October 2019
Identifiers
Local EPrints ID: 496198
URI: http://eprints.soton.ac.uk/id/eprint/496198
ISSN: 0004-6361
PURE UUID: 52c7c7c0-c7fc-4341-a1c5-9bd62ae5175c
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Date deposited: 06 Dec 2024 17:40
Last modified: 22 Aug 2025 02:45
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Author:
G. Navo
Author:
Jose Luis Tous Mayol
Author:
J.M. Solanes
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