SIMBAD references

2025A&A...699A.122O - Astronomy and Astrophysics, volume 699A122 (2025/7-1)

Bayesian ages of local young stellar associations I. Through the expansion rate method.

OLIVARES J., MIRET-ROIG N., GALLI P.A.B. and BOUY H.

Abstract (from CDS):

Context. Local young stellar associations (LYSAs <50 Myr and <150 pc) are important laboratories to test predictions from star formation theories. Estimating their ages through various dating techniques with minimal biases is thus of paramount importance.
Aims. We aim to determine the ages of LYSAs with the expansion rate dating technique.
Methods. We estimated the ages of the LYSAs using literature membership lists, publicly available data (astrometry and radial velocities), and a recent open-source Bayesian code that implements the expansion rate method. This code in combination with simple statistical assumptions allowed us to decontaminate, identify possible substructures or populations, and estimate expansion ages.
Results. We derive the largest and most methodological homogeneous set of ages of LYSAs. We rediscover three and discover four associations hidden within the literature membership lists of the classical ones.
Conclusions. The expansion ages we report here are compatible with literature age estimates. Moreover, our analysis shows that previous age tensions can be explained, in most cases, by the presence of unidentified populations or substructures.

Abstract Copyright: © The Authors 2025

Journal keyword(s): methods: statistical - open clusters and associations: general - solar neighborhood

VizieR on-line data: <Available at CDS (J/A+A/699/A122): tableb2.dat tableb3.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 33

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