From 1000 AU to 1000 pc: high proper-motion stars in the solar neighbourhood, radio sources in the sigma Orionis cluster, and new X-ray stars surrounding Alnilam

TL;DR

This paper demonstrates the versatility of the Virtual Observatory and Aladin sky atlas in conducting diverse astrophysical research, including proper motion studies, radio source analysis, and X-ray star identification in various stellar environments.

Contribution

It showcases practical applications of Aladin for multi-wavelength data analysis in studying low-mass stars, brown dwarfs, and stellar populations in clusters and associations.

Findings

Successful proper-motion search of low-mass stars and brown dwarfs.

Analysis of radio sources in sigma Orionis cluster.

Identification of X-ray young stars around Alnilam.

Abstract

The Virtual Observatory is useful. I summarise some of my works where I extensively use the Aladin sky atlas. Topics cover from the search and common proper motion confirmation of very low-mass stars and brown dwarfs in wide (rho > 1000 AU) binaries and multiple systems, to the identification and characterisation of stellar and substellar populations in young open clusters and OB associations at heliocentric distances of up to 1000 pc. I present three practical examples of what one can do with Aladin in one morning: a fruitful proper-motion search of objects with available ugrizJHKs photometry, an analysis of the 21 cm radio sources towards the young sigma Orionis cluster, and a novel study of X-ray young stars surrounding Alnilam in the Orion Belt.