Open clusters in Auriga OB2
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Título: | Open clusters in Auriga OB2 |
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Autor/es: | Marco, 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: Alicante 11 | Open clusters and associations: individual: Alicante 12 | Open clusters and associations: individual: Stock 8 |
Área/s de conocimiento: | Física Aplicada | Astronomía y Astrofísica |
Fecha de publicación: | 11-jun-2016 |
Editor: | Oxford University Press |
Cita bibliográfica: | Monthly Notices of the Royal Astronomical Society. 2016, 459(1): 880-901. doi:10.1093/mnras/stw640 |
Resumen: | We study the area around the H ii region Sh 2-234, including the young open cluster Stock 8, to investigate the extent and definition of the association Aur OB2 and the possible role of triggering in massive cluster formation. We obtained Strömgren and J, H, KS photometry for Stock 8 and Strömgren photometry for two other cluster candidates in the area, which we confirm as young open clusters and name Alicante 11 and Alicante 12. We took spectroscopy of ∼33 early-type stars in the area, including the brightest cluster members. We calculate a common distance of 2.80+0.27−0.24 kpc for the three open clusters and surrounding association. We derive an age 4–6 Ma for Stock 8, and do not find a significantly different age for the other clusters or the association. The star LS V +34∘23, with spectral type O8 II(f), is likely the main source of ionization of Sh 2-234. We observe an important population of pre-main-sequence stars, some of them with discs, associated with the B-type members lying on the main sequence. We interpret the region as an area of recent star formation with some residual and very localized ongoing star formation. We do not find evidence for sequential star formation on a large scale. The classical definition of Aur OB2 has to be reconsidered, because its two main open clusters, Stock 8 and NGC 1893, are not at the same distance. Stock 8 is probably located in the Perseus arm, but other nearby H ii regions whose distances also place them in this arm show quite different distances and radial velocities and, therefore, are not connected. |
Patrocinador/es: | This research is partially supported by the Spanish Ministerio de Ciencia e Innovación (MICINN) under grants AYA2012-39364-C02-02 and AYA2015-68012-C2-2-P, and by the Generalitat Valenciana (ACOMP/2014/129). AM acknowledges support from the Generalitat Valenciana through the grant BEST/2015/242 and from the Ministerio de Educación, Cultura y Deporte through the grant PRX15/00030. |
URI: | http://hdl.handle.net/10045/59176 |
ISSN: | 0035-8711 (Print) | 1365-2966 (Online) |
DOI: | 10.1093/mnras/stw640 |
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 |
Versión del editor: | http://dx.doi.org/10.1093/mnras/stw640 |
Aparece en las colecciones: | INV - Astrofísica Estelar - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2016_Marco_Negueruela_MNRAS.pdf | 5,01 MB | Adobe PDF | Abrir Vista previa | |
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