Stars and brown dwarfs, spatial distribution, multiplicity, X-rays, discs, and the complete mass function of the sigma Orionis cluster

TL;DR

This study utilizes the Mayrit catalogue to analyze the sigma Orionis cluster, providing insights into its stellar and substellar populations, their spatial distribution, multiplicity, X-ray activity, discs, and the initial mass function from 18 to 0.035 solar masses.

Contribution

The paper presents new applications of the Mayrit catalogue, including preliminary results on wide binarity and the initial mass function in sigma Orionis.

Findings

Preliminary initial mass function extends from 18 to 0.035 Msol.

Initial results on very wide binarity in the cluster.

Updated catalogue with additional data is in progress.

Abstract

The young sigma Orionis cluster in the Orion Belt is an incomparable site for studying the formation and evolution of high-mass, solar-like, and low-mass stars, brown dwarfs, and substellar objects below the deuterium burning mass limit. The first version of the Mayrit catalogue was a thorough data compilation of cluster members and candidates, which is regularly used by many authors of different disciplines. I show two new applications of the catalogue and advance preliminar results on very wide binarity and the initial mass function from 18 to 0.035 Msol in sigma Orionis. The making-up of a new version of the Mayrit catalogue with additional useful data is in progress.