Universiteit Leiden

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Surveying young stars with Gaia: Orion and the Solar neighbourhood

dinsdag 22 oktober 2019
Rapenburg 73
2311 GJ Leiden


OB associations are loose groups of young, massive stars. They constitute the last stage of the massive star
formation process, and the context in which new stars are formed. Although OB associations have long been studied,
it is not clear how they form and disperse in the field and what are the characteristics of their stellar
populations. Further, not all O and B stars can be associated to groups or clusters, and a fraction of them moves at very high velocity: these are the so-called runaway stars.

The data of the Gaia satellite are crucial to unravel the structure and star formation history of the young associations, as they allow to study their spatial structure, kinematics, and ages with unprecedented precision.

In this thesis, I studied the properties of the stellar groups in the Orion OB association. I analysed the three dimensional arrangement of young stars in the solar neighbourhood, providing a view of the spatial configuration of young star forming regions within 500 pc from the Sun.
Finally I focused on searching massive runaway stars. By tracing back the candidate runaway stars to their parental group, we may obtain clues on massive star evolution and on the dynamical processes occurring within dense stellar clusters.

Lees de volledige samenvatting (pdf)


  • Prof.dr. P.T. de Zeeuw


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071 527 3282

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