Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST
We present the discovery of 12 metal-poor and distant pre–main sequence (PMS) candidates in the dwarf irregular galaxy Wolf–Lundmark–Melotte ∼968 kpc away, at a present-day metallicity of [Fe/H] ∼ –0.9. These candidates have masses between 1.25 and 5 M _⊙ , with ages <10 Myr, and exhibit signi...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/adafa5 |
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| author | Venu M. Kalari Ricardo Salinas Morten Andersen Guido De Marchi Monica Rubio Jorick S. Vink Hans Zinnecker |
| author_facet | Venu M. Kalari Ricardo Salinas Morten Andersen Guido De Marchi Monica Rubio Jorick S. Vink Hans Zinnecker |
| author_sort | Venu M. Kalari |
| collection | DOAJ |
| description | We present the discovery of 12 metal-poor and distant pre–main sequence (PMS) candidates in the dwarf irregular galaxy Wolf–Lundmark–Melotte ∼968 kpc away, at a present-day metallicity of [Fe/H] ∼ –0.9. These candidates have masses between 1.25 and 5 M _⊙ , with ages <10 Myr, and exhibit significant near-infrared excesses at 2.5 and 4.3 μ m. They are concentrated within a cluster roughly 10 pc (2″) across, situated in the H ii region [HM95]-9. These are the most distant and metal-poor PMS stars known, and they can offer new quantitative insights into star formation at low metallicities. |
| format | Article |
| id | doaj-art-fca61ae68a30451a919b7fae90df4ce3 |
| institution | Kabale University |
| issn | 2041-8205 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj-art-fca61ae68a30451a919b7fae90df4ce32025-02-10T16:05:46ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019801L1610.3847/2041-8213/adafa5Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWSTVenu M. Kalari0https://orcid.org/0000-0002-4641-2532Ricardo Salinas1https://orcid.org/0000-0002-1206-1930Morten Andersen2https://orcid.org/0000-0002-5306-4089Guido De Marchi3https://orcid.org/0000-0001-7906-3829Monica Rubio4https://orcid.org/0000-0002-5307-5941Jorick S. Vink5https://orcid.org/0000-0002-8445-4397Hans Zinnecker6Gemini Observatory/NSF’s NOIRLab , Casilla 603, La Serena, ChileNicolaus Copernicus Astronomical Center , Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa, PolandEuropean Southern Observatory , Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, GermanyEuropean Space Agency (ESA), European Space Research and Technology Centre (ESTEC) , Keplerlaan 1, 2201 AZ Noordwijk, The NetherlandsDepartamento de Astronomía, Universidad de Chile , Santiago, ChileArmagh Observatory and Planetarium , Division or Department, College Hill, BT61 9DG Armagh, UKUniversidad Autónoma de Chile , Pedro de Valdivia 425, Providencia, Santiago de Chile, ChileWe present the discovery of 12 metal-poor and distant pre–main sequence (PMS) candidates in the dwarf irregular galaxy Wolf–Lundmark–Melotte ∼968 kpc away, at a present-day metallicity of [Fe/H] ∼ –0.9. These candidates have masses between 1.25 and 5 M _⊙ , with ages <10 Myr, and exhibit significant near-infrared excesses at 2.5 and 4.3 μ m. They are concentrated within a cluster roughly 10 pc (2″) across, situated in the H ii region [HM95]-9. These are the most distant and metal-poor PMS stars known, and they can offer new quantitative insights into star formation at low metallicities.https://doi.org/10.3847/2041-8213/adafa5Star formationPre-main sequenceDwarf irregular galaxies |
| spellingShingle | Venu M. Kalari Ricardo Salinas Morten Andersen Guido De Marchi Monica Rubio Jorick S. Vink Hans Zinnecker Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST The Astrophysical Journal Letters Star formation Pre-main sequence Dwarf irregular galaxies |
| title | Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST |
| title_full | Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST |
| title_fullStr | Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST |
| title_full_unstemmed | Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST |
| title_short | Discovery of Metal-poor and Distant Pre–Main Sequence Candidates in WLM with JWST |
| title_sort | discovery of metal poor and distant pre main sequence candidates in wlm with jwst |
| topic | Star formation Pre-main sequence Dwarf irregular galaxies |
| url | https://doi.org/10.3847/2041-8213/adafa5 |
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