CASAMIQUELA, Laia; GEBRAN, Marwan; AGÜEROS, Marcel A.; BOUY, Hervé; SOUBIRAN, Caroline

doi:10.3847/1538-3881/ac9c56

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

CASAMIQUELA, Laia
Galaxies, Etoiles, Physique, Instrumentation [GEPI]

GEBRAN, Marwan

AGÜEROS, Marcel A.

Langue

Article de revue

Ce document a été publié dans

The Astronomical Journal. 2022, vol. 164

American Astronomical Society

Résumé en anglais

The recently rediscovered open cluster Stock 2, located roughly 375 pc away and about 400 Myr old, has the potential to be an exciting new testbed for our understanding of stellar evolution. We present results from a spectroscopic campaign to characterize stars near the cluster's main-sequence turnoff; our goal is to identify candidate chemically peculiar stars among the cluster's A stars. We obtained échelle spectra for 64 cluster members with ESPaDOnS on the 3.6 m Canada-France-Hawaii Telescope, Maunakea Observatory, USA, and for six stars with SOPHIE on the 1.93 m telescope at the Observatoire de Haute-Provence, France. We complemented these new observations with those of 13 high-mass cluster members from the HARPS-N archive; our overall sample is of 71 stars. We derived the fundamental parameters (T <SUB>eff</SUB>, $\mathrm{log}g$ , [M/H]) as well as ${v}_{e}\sin i$ for our sample using the sliced inverse regression technique, and then used iSpec to derive individual abundances of 12 chemical species. With these abundance determinations, we identified nine A stars with anomalous levels of Sc, Ca, and other metallic lines. Follow-up observations of these Am candidates with a known age can transform them into benchmarks for evolutionary models that include atomic diffusion and help build a better understanding of the complex interactions between macroscopic and microscopic processes in stellar interiors.< Réduire

Mots clés en anglais

A stars

Open star clusters

Chemical abundances

Chemically peculiar stars

1160

224

226

Astrophysics - Solar and Stellar Astrophysics

Astrophysics - Astrophysics of Galaxies

Métadonnées

Licence d’utilisation du document

Chemically Peculiar Stars in the Open Cluster Stock 2

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche