| Issue |
A&A
Volume 478, Number 2, February I 2008
|
|
|---|---|---|
| Page(s) | 667 - 674 | |
| Section | Online catalogs and data | |
| DOI | https://doi.org/10.1051/0004-6361:20077885 | |
| Published online | 04 December 2007 | |
Stars and brown dwarfs in the σ Orionis cluster: the Mayrit catalogue *
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany e-mail: caballero@astrax.fis.ucm.es
Received:
15
May
2007
Accepted:
22
October
2007
Context.The young σ 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.
Aims.I present the Mayrit catalogue, which comprises most of the stars and high-mass brown dwarfs in the cluster.
Methods.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 σ Ori AB. The analysis is supported by a bibliographic search of confirmed cluster members with features of youth and by additional X-ray, mid-infrared, and astrometric data.
Results.I list 241 σ 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.
Conclusions.This catalogue is a suitable input for studying the spatial ditribution, multiplicity, properties and frequency of discs, and the complete mass function of σ Orionis.
Key words: astronomical data bases: miscellaneous / stars: low-mass, brown dwarfs / Galaxy: open clusters and associations: individual: σ Orionis
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.