Cygnus OB2 · 42
42 stars
Measured
Berlanas et al. 2018: 42 newly confirmed massive OB stars in Cygnus OB2 and surroundings.
PhotoNASA/CXC/SAO/J. Drake et al.; optical INT/IPHAS; IR NASA/JPL-CaltechPUBLIC DOMAIN
A spectroscopic survey took 61 candidates. 42 classified as new massive stars earlier than B3, including 11 O stars. The 42 is the confirmed sample, not a permanent census of Cygnus OB2.
What it supports
A dated observational result. A&A 612, A50 (2018). Open access.
What it does not
Not the defining population of Cygnus OB2. Sample-bound. Not Kepler-42. Deeper ledger, not a sky law.
ExactnessExact
Form42
Unitcount
Strengthhard
When2018