Young stars and brown dwarfs surrounding Alnilam (eps Ori) and Mintaka (del Ori)
J. A. Caballero, E. Solano

TL;DR
This study explores young stellar and substellar populations around Alnilam and Mintaka in Orion, identifying new candidate members, compiling catalogs, and comparing their distributions to the sigma Orionis cluster to find potential new clusters.
Contribution
It provides the first detailed survey of young stars and brown dwarf candidates in these regions, revealing a new open cluster and comparing their properties to sigma Orionis.
Findings
Identified 136 young stars with youth indicators.
Discovered 2 brown dwarf and 289 star candidates.
Reported a new open cluster centered on Mintaka.
Abstract
Aims: We look for new regions for the search of substellar objects. Methods: Two circular areas, 45 arcmin-radius each, centred on the young massive star systems Alnilam and Mintaka in the Orion Belt, have been explored. The regions are very young (less than 10 Ma), have low extinction, and are neighbours to sigma Orionis (~3 Ma), a young open cluster very rich in brown dwarfs and planetary-mass objects. We have used Virtual Observatory tools, the astro-photometric Tycho-2, DENIS and 2MASS catalogues, 10 control fields at similar galactic latitudes, and X-ray, mid-infrared and spectroscopic data from the literature. Results: We have compiled exhaustive lists of known young stars and new candidate members in the Ori OB1b association, and of fore- and background sources. A total of 136 stars display features of extreme youth, like early spectral types, lithium in absorption, or…
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