Analysis of Binary Cluster Interactions with Gaia DR2
Two star clusters can be located near each other as a result of either simultaneous birth or system encounters, and thus are called a binary cluster system. There are various cluster separation criteria used by studies in order to determine the bina- rity of a pair of clusters. Studies of binary...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/39284 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Two star clusters can be located near each other as a result of either simultaneous
birth or system encounters, and thus are called a binary cluster system. There are
various cluster separation criteria used by studies in order to determine the bina-
rity of a pair of clusters. Studies of binary clusters in Magellanic Clouds classied
two clusters with projected separation < 20 pc as a binary cluster (e.g., Bhatia &
Hatzidimitriou 1988), while in studies of Galactic binary clusters have used physical
separation < 30 pc (de la Fuente Marcos & de la Fuente Marcos 2009) or 100 pc
and velocity dierence of < 20 km s????1 (Conrad dkk. 2017).
In this research, a list of Galactic binary cluster candidates is compiled from
the open cluster catalogue by Cantat-Gaudin dkk. (2018), which is based on Gaia
DR2. The criterion adopted by this work is the pair's physical separation must be
less than 50 pc. With this criterion, 66 pairs are found; some of which have more
than one neighbour identied. From the list, three candidate pairs were chosen
to be analysed further: ASCC 16{ASCC 21, NGC 6716{Collinder 394, dan NGC
2547{Pozzo 1. Each pair has physical separation of 13 pc, 13 pc, and 46 pc. For
each cluster, membership analysis and isochrone tting are done to estimate its age
and photometric mass. The pairs ASCC 16{ASCC 21 and NGC 6716{Collinder
394 are found to be coeval with ages 10 Myr and 126 Myr respectively, while NGC
2547 and Pozzo 1 are found to be 25 and 13 Myr old respectively. For ASCC 16{
ASCC 21 and NGC 6716{Collinder 394, the separation between each cluster in the
respective pairs is close enough to be interacting binary, while the wide pair NGC
2547{Pozzo 1 is not. Analysis of tangential kinematics of ASCC 16{ASCC 21 dan
NGC 6716{Collinder 394 also shows that each pair may be gravitationally bound.
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