Abstract: Massive stars are key players in many astrophysical processes, and a significant fraction of them are runaway stars—stars moving at unusually high velocities through space. These objects are thought to originate from stellar clusters or disrupted binaries, but their formation mechanisms and connections to systems hosting compact objects remain poorly understood. 

This thesis explores the population of massive runaway stars in the Milky Way using data from the Gaia mission, complemented by multiwavelength archival data, radio observations, and high-resolution spectroscopy. A new method to identify runaway stars in a self-consistent way is presented in this thesis, which allows for the discovery of both fast and slow-moving systems. This work led to the compilation of extensive catalogs of O- and Be-type runaway stars, providing new insights into their origins, evolution, and possible links to high-energy binary systems. These findings offer a foundation for future searches of massive runaway stars, studies of young clusters, compact object companions and high-energy binary systems in our Galaxy.
 

Tribunal:

President: Dr. Sergio Simón Díaz

Secretary: Dr. Mercè Romero Gómez  

Vocal: Dra. Julia Bodensteiner 

Suplents:

Dr. Benito Marcote 

Dr. Francesc Xavier Luri Carrascoso

Directors: Dr. Marc Ribó Gomis, Dr. Josep Maria Paredes Poy

Tutor: Dr. Alberto Manrique Oliva