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Mapping young stellar populations towards Orion with Gaia DR1

Published online by Cambridge University Press:  07 March 2018

Eleonora Zari  and
Anthony G. A. Brown
Eleonora Zari
Affiliation:
Leiden Observatory, Niels Bohrweg 2, 2333 CA Leiden, the Netherlands email: [email protected]
Anthony G. A. Brown
Affiliation:
Leiden Observatory, Niels Bohrweg 2, 2333 CA Leiden, the Netherlands email: [email protected]
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Abstract

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OB associations are prime sites for the study of star formation processes and of the interaction between young massive stars with the interstellar medium. Furthermore, the kinematics and structure of the nearest OB associations provide detailed insight into the properties and origin of the Gould Belt. In this context, the Orion complex has been extensively studied. However, the spatial distribution of the stellar population is still uncertain: in particular, the distances and ages of the various sub-groups composing the Orion OB association, and their connection to the surrounding interstellar medium, are not well determined. We used the first Gaia data release to characterize the stellar population in Orion, with the goal to obtain new distance and age estimates of the numerous stellar groups composing the Orion OB association. We found evidence of the existence of a young and rich population spread over the entire region, loosely clustered around some known groups. This newly discovered population of young stars provides a fresh view of the star formation history of the Orion region.

Keywords

Stars: distances - stars: formation - stars: pre-main sequence - stars: early-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 197 - 200
Copyright
Copyright © International Astronomical Union 2018 

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