New very massive stars in Cygnus OB2
Ignacio Negueruela, Amparo Marco (Alicante), Artemio Herrero (IAC, La, Laguna), Simon Clark (Open University)

TL;DR
This study identifies new very massive stars in Cygnus OB2, refining its age and mass estimates, and suggesting a complex star formation history with both young and older stellar populations.
Contribution
The paper reports the discovery of several new evolved very massive stars and O-type stars in Cygnus OB2, improving understanding of its stellar content and mass.
Findings
Identification of 5-6 new very massive stars
Refined age estimate of ~2.5 million years
Evidence for multiple stellar populations with different ages
Abstract
The compact association Cygnus OB2 is known to contain a large population of massive stars, but its total mass is currently a matter of debate. While recent surveys have uncovered large numbers of OB stars in the area around Cyg OB2, detailed study of the optically brightest among them suggests that most are not part of the association. We observed an additional sample of optically faint OB star candidates, with the aim of checking if more obscured candidates are correspondingly more likely to be members of Cyg OB2. Low resolution spectra of 9 objects allow the rejection of one foreground star and the selection of four O-type stars, which were later observed at higher resolution. In a subsequent run, we observed three more stars in the classification region and three other stars in the far red. We identify five (perhaps six) new evolved very massive stars and three main sequence O-type…
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