Multidimensional Bayesian membership analysis of the Sco OB2 moving group

  title={Multidimensional Bayesian membership analysis of the Sco OB2 moving group},
  author={Aaron C. Rizzuto and Michael J. Ireland and J. Gordon Robertson},
  journal={Monthly Notices of the Royal Astronomical Society},
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 2nd Catalogue of Radial Velocities with Astrometric Data (CRVAD-2). The Bayesian membership selection method developed makes no distinction between subgroups of Sco OB2 and utilizes linear models in calculation of membership probabilities. We select 436 members, 88 of which are new members not included in previous membership… 

Figures and Tables from this paper

WISE circumstellar discs in the young Sco-Cen association
We present an analysis of the WISE photometric data for 829 stars in the Sco-Cen OB2 association, using the latest high-mass membership probabilities. We detect infrared excesses associated with 135
A Large Moving Group within the Lower Centaurus Crux Association
Scorpius–Centaurus is the nearest OB association, and its hundreds of members are divided into subgroups, including the Lower Centaurus Crux (LCC). Here we study the dynamics of the LCC area. We
Long-baseline interferometric multiplicity survey of the Sco-Cen OB association
We present the rst multiplicity-dedicated long baseline optical interferometric survey of the Scorpius-Centaurus-Lupus-Crux association. We used the Sydney University Stellar Interferometer to
BANYAN. XII. New Members of Nearby Young Associations from GAIA–Tycho Data
We present a search for stellar members of young associations within 150 pc of the Sun, based on TGAS and an updated version of the BANYAN Σ software to determine Bayesian membership probabilities
Stellar population of Sco OB2 revealed by Gaia DR2 data
Context. The Sco OB2 association is the nearest OB association, extending over approximately 2000 square degrees on the sky. Only its brightest and most massive members are already known (from
Nearby Young Moving Groups: Statistical Methods and Challenges for Assigning Membership
Abstract Young associations, being sparsely populated and relatively close to the Sun, their members are found all over the sky. In the Solar Neighborhood, young moving groups are found within 100 pc
New Young Stars and Brown Dwarfs in the Upper Scorpius Association
To improve the census of the Upper Sco association, candidate members are identified using parallaxes, proper motions, and color-magnitude diagrams from several wide-field imaging surveys and optical and infrared spectra of several hundred candidates are obtained to measure their spectral types and assess their membership.
New member candidates of Upper Scorpius from Gaia DR1
Context. Selecting a cluster in proper motion space is an established method for identifying members of a star-forming region. The first data release from Gaia (DR1) provides an extremely large and
Three-dimensional structure of the Upper Scorpius association with the Gaia first data release
Using new proper motion data from recently published catalogs, we revisit the membership of previously identified members of the Upper Scorpius association. We confirmed 750 of them as cluster
BANYAN. IX. The Initial Mass Function and Planetary-mass Object Space Density of the TW HYA Association
A determination of the initial mass function (IMF) of the current, incomplete census of the 10 Myr-old TW Hya association (TWA) is presented. This census is built from a literature compilation


Identification of moving groups and member selection using Hipparcos data
A new method to identify coherent structures in velocity space – moving groups – in astrometric catalogues is presented: the Spaghetti method. It relies on positions, parallaxes and proper motions,
Kinematics and history of the solar neighbourhood revisited
We use proper motions and parallaxes from the new reduction of Hipparcos data and Geneva-Copenhagen radial velocities for a complete sample of ∼15 000 main-sequence and subgiant stars, and new Padova
A refurbished convergent-point method for finding moving groups in the Hipparcos Catalogue★
The Hipparcos data allow a major step forward in the research of ‘moving groups’ in the Solar neighbourhood, as the common motion of group members causes converging proper motions. Previous knowledge
Exploring the Full Stellar Population of the Upper Scorpius OB Association
We investigate the stellar population and star formation history of the Upper Scorpius OB association, the most nearby region of recent massive star formation, over the full stellar mass range from
A synthetic view on structure and evolution of the Milky Way
Since the Hipparcos mission and recent large scale surveys in the optical and the near-infrared, new constraints have been obtained on the structure and evolution history of the Milky Way. The
Sequential formation of subgroups in OB associations
We reconsider the structure and formation of OB association in view of recent radio and infrared observations of the adjacent molecular clouds. As a result of this reexamination, we propose that OB
Spatial distributions of young stars
We analyze the spatial distribution of young stars in Taurus-Auriga and Upper Sco, as determined from the two-point correlation function (i.e., the mean surface density of neighbors). The
Astrophysical supplements to the ASCC‐2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations
We present the 2nd version of the Catalogue of Radial Velocities with Astrometric Data (CRVAD-2). This is the result of the cross-identification of stars from the All-Sky Compiled Catalogue of 2.5
Catalogue général de vitesses radiales moyennes pour les étoiles galactiques. Mean radial velocities catalog of galactic stars
We present a catalogue of mean radial velocities for Galactic stars which supplements the catalogue WEB (Duflot et al. 1995) with observations published through december 1990. The catalogue contains
The radial velocity experiment (RAVE): First data release
The first data release of the Radial Velocity Experiment (RAVE) is presented and it is demonstrated that the radial velocities derived for the first data set do not show any systematic trend with color or signal-to-noise ratio.