Fundamental physical parameters describing the Cygnus OB2 association.
|Dec (J2000)||+41° 19′00″||1|
|Virial mass||(9.3 ± 0.8)×105 M⊙||3|
|Volume density||∼100 stars pc−3||4|
|Age||1–7 Myr (Peak 4–5 Myr)||2|
|Distance||1.4 ± 0.08 kpc||5|
|Visual extinction, AV||4m − 7m (IQR⋆)||2|
|OB members||2600 ± 400||6|
|3D velocity dispersion||17.8 ± 0.6 km s−1||3|
|Half-light radius||10.1 ± 0.9′(4.1 pc)||3|
|Observational diameter||∼2° (∼49 pc)||6|
Notes. The RA and Dec describe the centre of the association as chosen by numerous authors based on the position of the main concentration of OB stars. ( ⋆ )Interquartile range (IQR).
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