The Massive Star Population of Cygnus OB2
Nicholas J. Wright, Janet E. Drew, and Michael Mohr-Smith

TL;DR
This study provides a comprehensive census of massive stars in Cygnus OB2, analyzing their properties, formation history, and mass function, revealing insights into the association's evolution and its significance as a massive star-forming region.
Contribution
It offers the first detailed, homogenized catalog of massive stars in Cygnus OB2, combining observational data with stellar evolution models to derive ages, masses, and the star formation history.
Findings
Mass function slope consistent with universal value of 1.3
Star formation occurred mainly between 1 and 7 Myr ago
Total mass of the association estimated at approximately 16,500 solar masses
Abstract
We have compiled a significantly updated and comprehensive census of massive stars in the nearby Cygnus OB2 association by gathering and homogenising data from across the literature. The census contains 169 primary OB stars, including 52 O-type stars and 3 Wolf-Rayet stars. Spectral types and photometry are used to place the stars in a Hertzprung-Russell diagram, which is compared to both non-rotating and rotating stellar evolution models, from which stellar masses and ages are calculated. The star formation history and mass function of the association are assessed, and both are found to be heavily influenced by the evolution of the most massive stars to their end states. We find that the mass function of the most massive stars is consistent with a `universal' power-law slope of Gamma = 1.3. The age distribution inferred from stellar evolutionary models with rotation and the mass…
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