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Título:
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Low-resolution spectroscopy and spectral energy distributions of selected sources towards ? Orionis
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Autores:
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Caballero, J. A. ;
Valdivielso, L. ;
Martín, E. L. ;
Montes Gutiérrez, David ;
Pascual, S. ;
Pérez González, Pablo Guillermo
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Tipo de documento:
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texto impreso
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Editorial:
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EDP Sciencies, 2008-11
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Materia = Ciencias: Física: Astronomía
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Tipo = Artículo
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Resumen:
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Aims. We study in detail nine sources in the direction of the young ? Orionis cluster, which is considered to be a unique site for studying stellar and substellar formation. The nine sources were selected because of their peculiar properties, such as extremely-red infrared colours or excessively strong H? emission for their blue optical colours. Methods. We acquired high-quality, low-resolution spectroscopy (R ? 500) of the nine targets with ALFOSC at the Nordic Optical Telescope. We also re-analysed [24]-band photometry from MIPS/Spitzer and compiled the highest quality photometric dataset available at the ViJHK_s passbands and the four IRAC/Spitzer channels, for constructing accurate spectral energy distributions between 0.55 and 24 ?m. Results.
The nine targets were classified into: one Herbig Ae/Be star with a scattering edge-on disc; two G-type stars; one X-ray flaring, early-M, young star with chromospheric H? emission; one very low-mass, accreting, young spectroscopic binary; two young objects at the brown-dwarf boundary with the characteristics of classical T Tauri stars; and two emission-line galaxies, one undergoing star formation, and another whose spectral energy distribution is dominated by an active galactic nucleus. We also discovered three infrared sources associated with overdensities in a cold cloud of the cluster centre. Conclusions. Low-resolution spectroscopy and spectral energy distributions are a vital tool for measuring the physical properties and evolution of young stars and candidates in the ? Orionis cluster.
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En línea:
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https://eprints.ucm.es/37844/1/davidmontes29libre.pdf
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