A baseline on the relation between chemical patterns and the birth stellar cluster

Context. The chemical composition of a star’s atmosphere reflects the chemical composition of its birth environment. Therefore, it should be feasible to recognize stars born together that have scattered throughout the galaxy, solely based on their chemistry. This concept, known as “strong chemical t...

Full description

Saved in:
Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2024-08, Vol.688, p.A165
Main Authors: Signor, T., Jofré, P., Martí, L., Sánchez-Pi, N.
Format: Article
Language:English
Subjects:
Abundance
Apogees
Artificial Intelligence
Astrophysics
Chemical composition
Computer Science
Feasibility
Machine Learning
Marking
Neural and Evolutionary Computing
Open clusters
Performance degradation
Sciences of the Universe
Solar and Stellar Astrophysics
Star clusters
Stars
Supervised learning
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Context. The chemical composition of a star’s atmosphere reflects the chemical composition of its birth environment. Therefore, it should be feasible to recognize stars born together that have scattered throughout the galaxy, solely based on their chemistry. This concept, known as “strong chemical tagging”, is a major objective of spectroscopic studies, but it has yet to yield the anticipated results. Aims. We assess the existence and the robustness of the relation between chemical abundances and the birthplace using known member stars of open clusters. Methods. We followed a supervised machine learning approach, using chemical abundances obtained from APOGEE DR17, observed open clusters as labels, and different data preprocessing techniques. Results. We find that open clusters can be recovered with any classifier and on data whose features are not carefully selected. In the sample with no field stars, we obtain an average accuracy of 75.2% and we find that the prediction accuracy mostly depends on the uncertainties of the chemical abundances. When field stars outnumber the cluster members, the performance degrades. Conclusions. Our results show the difficulty of recovering birth clusters using chemistry alone, even in a supervised scenario. This clearly challenges the feasibility of strong chemical tagging. Nevertheless, including information about ages could potentially enhance the possibility of recovering birth clusters.
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/202449938