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The Villafranca project: Combining Gaia and ground-based surveys to study Galactic OB groups

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arxiv 2407.21399 v2 pith:E7TLATAE submitted 2024-07-31 astro-ph.GA astro-ph.IMastro-ph.SR

classification astro-ph.GAastro-ph.IMastro-ph.SR
keywords projectstarsgaiavillafrancacombiningdynamicalgalacticground-based
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abstract

The Villafranca project is studying Galactic stellar groups with OB stars combining information from $Gaia$ and ground-based surveys. We summarize the status of the project and we present its most important results. The Villafranca project has been used to produce a new astrometric calibration for $Gaia$ (E)DR3, which improves the previous one significantly for bright stars. We have discovered that dynamical interactions among massive stars at a very young age ($\sim$1 Ma or less) can play a significant interaction in the dynamical evolution of clusters. As a consequence, our current view of the massive-star IMF may be distorted and the number of free-floating neutron stars and black holes higher than previously considered.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A new Gaia census of OB associations within 1 kpc

    astro-ph.GA 2025-12 conditional novelty 7.0 of 10

    A new Gaia-based catalogue identifies 57 kinematically coherent OB associations within 1 kpc of the Sun, twice as many as previously known, and finds most are expanding.

  2. OB associations: from stellar to galactic scales

    astro-ph.GA 2024-12 accept novelty 2.0 of 10

    A review of OB associations that synthesizes how Gaia data has redefined their members, subgroups, and open clusters, and proposes them as tracers of spiral arm kinematics.

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