Stars and brown dwarfs in the sigma Orionis cluster: the Mayrit catalogue

Abstract

The young sigma Orionis cluster is an indispensable basis for understanding the formation and evolution of stars, brown dwarfs and planetary-mass objects. Our knowledge of its stellar population is, however, incomplete. I present the Mayrit catalogue, that comprises most of the stars and high-mass brown dwarfs of the cluster. The basis of this work is an optical-near infrared correlation between the 2MASS and DENIS catalogues in a circular area of radius 30 arcmin centred on the OB-type binary sigma Ori AB. The analysis is supported on a bibliographic search of confirmed cluster members with features of youth and on additional X-ray, mid-infrared and astrometric data. I list 241 sigma Orionis stars and brown dwarfs with known features of youth, 97 candidate cluster members (40 are new) and 115 back- and foreground sources in the survey area. The 338 cluster members and member candidates constitute the Mayrit catalogue. This catalogue is a suitable input for studying the spatial ditribution, multiplicity, properties and frequency of discs and the complete mass function of sigma Orionis.

accepted for publication in A&A, section 14. Online catalogs and data

References in corpus (2)

• Rotation and accretion of very low mass objects in the SigmaOri cluster
• Spatial distribution of stars and brown dwarfs in sigma Orionis

Cited by in corpus (7)

• Disks around Brown Dwarfs in the Sigma Orionis Cluster
• Contamination by field late-M, L and T dwarfs in deep surveys
• A deep look into the cores of young clusters I. sigma-Orionis
• Young stars and brown dwarfs surrounding Alnilam (eps Ori) and Mintaka (del Ori)
• Low-resolution spectroscopy and spectral energy distributions of selected sources towards sigma Orionis
• A revisit to agglomerates of early-type Hipparcos stars
• New deep XMM-Newton observations to the west of the sigma Orionis cluster