On the possibility of a collisional origin for the blue stragglers and contact binaries in the old open clusters M67 and NGC 188

1992 ◽  
Vol 103 ◽  
pp. 1928 ◽  
Author(s):  
Peter J. T. Leonard ◽  
Albert P. Linnell
Keyword(s):  
Open Clusters ◽  
Blue Stragglers ◽  
Contact Binaries

scholarly journals Three New Contact Binaries Near the Centre of NGC 6121 (M4)

1995 ◽  
Vol 164 ◽  
pp. 401-401
Author(s):  
J. W. Menzies
Keyword(s):  
Preliminary Analysis ◽  
Globular Clusters ◽  
Blue Stragglers ◽  
Contact Binaries

The central 2×3 arcmin2 region of M4 has been observed as part of a programme to find blue stragglers in globular clusters. A preliminary analysis has been carried out of 58 V frames and 65 I frames obtained on two separate occasions with an RCA CCD on the 1.0m telescope at Sutherland.

A CCD survey for contact binaries in six open clusters

1988 ◽  
Vol 95 ◽  
pp. 785 ◽  
Author(s):  
Janusz Kaluzny ◽  
Michael M. Shara
Keyword(s):  
Open Clusters ◽  
Contact Binaries

scholarly journals The blue stragglers formed via mass transfer in old open clusters

2006 ◽  
Vol 455 (1) ◽  
pp. 247-254 ◽  
Author(s):  
B. Tian ◽  
L. Deng ◽  
Z. Han ◽  
X. B. Zhang
Keyword(s):  
Mass Transfer ◽  
Open Clusters ◽  
Blue Stragglers

scholarly journals Neutron Star Binaries in Open Clusters

1996 ◽  
Vol 160 ◽  
pp. 541-542 ◽  
Author(s):  
Sverre Aarseth ◽  
Rosemary Mardling
Keyword(s):  
Neutron Star ◽  
Open Clusters ◽  
Exchange Reactions ◽  
Multiple Systems ◽  
Blue Stragglers ◽  
Tidal Interactions ◽  
Accurate Treatment ◽  
History Of ◽  
Binary Evolution ◽  
Consistent Treatment

We useN-body simulations of open clusters to examine the evolutionary history of binaries containing neutron stars. The model includes consistent treatment of all the relevant processes (Aarseth 1996):•Synthetic stellar evolution–mass and radius as a function of time (Eggleton et al. 1989)•Accurate treatment of close encounters–Perturbations of binaries and stable multiple systems - Exchange reactions (involving triple and binary-binary interactions) - Collisions → blue stragglers•Binary evolution (primordial and dynamically formed)–Tidal interactions (Mardling & Aarseth 1996) - Stable mass transfer - Common envelope evolution - Magnetic braking - Gravitational radiation - Mergers (including blue stragglers)•Mass loss–Stellar winds - Supernovae - Evaporation of stars from the cluster•Neutron star formation–Supernovae with kick velocities of Lyne & Lorimer (1994), Drukier (1996) - Accretion-induced collapse

scholarly journals UOCS*. III. UVIT catalogue of open clusters with machine learning based membership using Gaia EDR3 astrometry

2021 ◽  
Author(s):  
Vikrant V Jadhav ◽  
Clara M Pennock ◽  
Annapurni Subramaniam ◽  
Ram Sagar ◽  
Prasanta Kumar Nayak
Keyword(s):  
Machine Learning ◽  
Main Sequence ◽  
Learning Algorithm ◽  
Ultra Violet ◽  
Gaussian Mixture ◽  
Open Clusters ◽  
Red Giants ◽  
Cluster Membership ◽  
Blue Stragglers ◽  
Red Clump

Abstract We present a study of six open clusters (Berkeley 67, King 2, NGC 2420, NGC 2477, NGC 2682 and NGC 6940) using the Ultra Violet Imaging Telescope (UVIT) aboard ASTROSAT and Gaia EDR3. We used combinations of astrometric, photometric and systematic parameters to train and supervise a machine learning algorithm along with a Gaussian mixture model for the determination of cluster membership. This technique is robust, reproducible and versatile in various cluster environments. In this study, the Gaia EDR3 membership catalogues are provided along with classification of the stars as members, candidates and field in the six clusters. We could detect 200–2500 additional members using our method with respect to previous studies, which helped estimate mean space velocities, distances, number of members and core radii. UVIT photometric catalogues, which include blue stragglers, main-sequence and red giants are also provided. From UV–Optical colour-magnitude diagrams, we found that majority of the sources in NGC 2682 and a few in NGC 2420, NGC 2477 and NGC 6940 showed excess UV flux. NGC 2682 images have ten white dwarf detection in far-UV. The far-UV and near-UV images of the massive cluster NGC 2477 have 92 and 576 members respectively, which will be useful to study the UV properties of stars in the extended turn-off and in various evolutionary stages from main-sequence to red clump. Future studies will carry out panchromatic and spectroscopic analysis of noteworthy members detected in this study.

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