Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-06-15
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
27 pages, 10 figures, accepted for publication in MNRAS
Scientific paper
We present a new high-mass membership of the nearby Sco OB2 association based on HIPPARCOS positions, proper motions and parallaxes and radial velocities taken from the Kharchenko et al. (2007) catalogue. The Bayesian membership selection method developed makes no distinction between subgroups of Sco OB2 and utilises linear models in calculation of membership probabilities. We select 436 members, 88 of which are new members not included in previous membership selections. We include the classical non members Alpha-Cru and Beta-Cru as new members as well as the pre-main-sequence stars HIP 79080 and 79081. We also show that the association is well mixed over distances of 8 degrees on the sky, and hence no determination can be made as to the formation process of the entire association.
Ireland Michael J.
Rizzuto Aaron C.
Robertson Gordon J.
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