The outskirts of Cygnus OB2
F. Comeron, A. Pasquali, F. Figueras, J. Torra

TL;DR
This study explores the extended halo of early-type stars around Cygnus OB2, revealing a widespread population of evolved stars indicating a long-standing massive star formation history in the region.
Contribution
It provides the first detailed analysis of the extended stellar population around Cygnus OB2, challenging previous claims of its large spatial extent.
Findings
Identification of 96 early-type stars in the region.
Detection of a widespread evolved star population.
No evidence supporting a larger extent of Cygnus OB2 beyond its core.
Abstract
We investigate the possible existence of an extended halo of early-type stars around Cygnus OB2, which is hinted at by near-infrared color-color diagrams, and its relationship to Cygnus OB2 itself, as well as to the nearby association Cygnus OB9 and to the star forming regions in the Cygnus X North complex. A total of 96 early-type stars are identified in the targeted region, which amounts to nearly half of the observed sample. Most of them have featureless near-infrared spectra as expected from OB stars at the available resolution. Another 18 stars that display Brackett emission lines can be divided between evolved massive stars (most likely Be stars) and Herbig Ae/Be stars based on their infrared excesses. A component associated with Cygnus OB9/NGC 6910 is clearly identified, as well as an enhancement in the surface density of early-type stars at Cygnus X North. We also find a field…
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