The little-studied cluster Berkeley 90 – III. Cluster parameters

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Título: The little-studied cluster Berkeley 90 – III. Cluster parameters
Autor/es: Marco Tobarra, Amparo | Negueruela, Ignacio
Grupo/s de investigación o GITE: Astrofísica Estelar (AE)
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Palabras clave: Stars: early-type | Stars: evolution | Hertzsprung–Russell and colour–magnitude diagrams | Open clusters and associations: individual: Berkeley 90
Área/s de conocimiento: Física Aplicada | Astronomía y Astrofísica
Fecha de publicación: 11-feb-2017
Editor: Oxford University Press
Cita bibliográfica: Monthly Notices of the Royal Astronomical Society. 2017, 465(1): 784-797. doi:10.1093/mnras/stw2764
Resumen: The open cluster Berkeley 90 is the home to one of the most massive binary systems in the Galaxy, LS III +46∘11, formed by two identical, very massive stars (O3.5 If* + O3.5 If*), and a second early-O system (LS III +46∘12 with an O4.5 IV((f)) component at least). Stars with spectral types earlier than O4 are very scarce in the Milky Way, with no more than 20 examples. The formation of such massive stars is still an open question today, and thus the study of the environments where the most massive stars are found can shed some light on this topic. To this aim, we determine the properties and characterize the population of Berkeley 90 using optical, near-infrared and WISE photometry and optical spectroscopy. This is the first determination of these parameters with accuracy. We find a distance of 3.5+0.5−0.5 kpc and a maximum age of 3 Ma. The cluster mass is around 1000 M⊙ (perhaps reaching 1500 M⊙ if the surrounding population is added), and we do not detect candidate runaway stars in the area. There is a second population of young stars to the southeast of the cluster that may have formed at the same time or slightly later, with some evidence for low-activity ongoing star formation.
Patrocinador/es: This research is partially supported by the Spanish Government Ministerio de Economía y Competitivad (MINECO/FEDER) under grant AYA2015-68012-C2-2-P. AM acknowledges support from the Ministerio de Educación, Cultura y Deporte through the grant PRX15/00030.
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stw2764
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Revisión científica: si
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Aparece en las colecciones:INV - Astrofísica Estelar - Artículos de Revistas

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