RT Journal Article
T1 Low-resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis
A1 Caballero, J. A.
A1 Valdivielso, L.
A1 Martín, E. L.
A1 Montes Gutiérrez, David
A1 Pascual, S.
A1 Pérez González, Pablo Guillermo
AB Aims. We study in detail nine sources in the direction of the young σ 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 Hα 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 μm. 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 Hα 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 σ Orionis cluster.
PB EDP Sciencies
SN 0004-6361
YR 2008
FD 2008-11
LK https://hdl.handle.net/20.500.14352/51879
UL https://hdl.handle.net/20.500.14352/51879
LA eng
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NO © ESO 2008. We thank the anonymous referee, G. Barro Calvo, M. Rego, V. Villar, and J. Zamorano for helpful comments. The data presented here have been taken using ALFOSC, which is owned by the Instituto de Astrofísica de Andalucía (IAA) and operated at the Nordic Optical Telescope under agreement between IAA and the NBIfAFG of the Astronomical Observatory of Copenhagen. Partial financial support was provided by the Universidad Complutense de Madrid, the Spanish Virtual Observatory, the Spanish Ministerio Educación y Ciencia, and the European Social Fund under grants AyA2005-02750, AyA2005-04286, AyA2005-24102-E, and AyA2007-67458 of the Programa Nacional de Astronomía y Astrofísica and by the Comunidad Autónoma de Madrid under PRICIT project S-0505/ESP-0237 (AstroCAM).
NO Comunidad Autonóma de Madrid
NO Universidad Complutense de Madrid (UCM)
NO Spanish Virtual Observatory (VSO)
NO Plan Regional de Investigación Científica e Innovación Tecnológica (PRICIT), CAM
NO Ministerio Educación y Ciencia (MEC), España
NO Programa Nacional de Astronomía y Astrofísica (PNAyA)
DS Docta Complutense
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