English

Discovery of metal-poor and distant pre-main sequence candidates in WLM with JWST

Solar and Stellar Astrophysics 2025-01-30 v2 Astrophysics of Galaxies

Abstract

We present the discovery of twelve metal-poor and distant pre-main sequence (PMS) candidates in the dwarf irregular galaxy Wolf-Lundmark-Melotte (WLM)~968 kpc away, at a present-day metallicity of [Fe/H] around -0.9. These candidates have masses between 1.25-5 M_{\odot}, with ages <10 Myr, and exhibit significant near-infrared excesses at 2.5 and 4.3 μ\mum. They are concentrated within a cluster roughly 10 pc (2'') across situated in the HII region [HM95]-9. These are the most distant and metal-poor PMS stars known, and can offer new quantitative insights into star formation at low-metallicities.

Keywords

Cite

@article{arxiv.2501.17097,
  title  = {Discovery of metal-poor and distant pre-main sequence candidates in WLM with JWST},
  author = {Venu M. Kalari and Ricardo Salinas and Morten Andersen and Guido De Marchi and Monica Rubio and Jorick S. Vink and Hans Zinnecker},
  journal= {arXiv preprint arXiv:2501.17097},
  year   = {2025}
}

Comments

Accepted for publication in ApJ Letters. Comments welcome. 6 pages, 4 figures, and 1 table