Mass Estimation of Star Clusters using Radial Velocity and Proper Motion Data
<p align="justify"> <br /> <br /> Determination of the mass of system in the universe like a galaxy or cluster galaxy becomes an interesting topic for astronomers to study, as well as determination of smaller system such as globular and open star cluster. The mass of mas...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/29272 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | <p align="justify"> <br />
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Determination of the mass of system in the universe like a galaxy or cluster galaxy becomes an interesting topic for astronomers to study, as well as determination of smaller system such as globular and open star cluster. The mass of massive objects such as galaxies and galaxy clusters is usually determined by using the virial theorem. By utilizing virial theorem, total mass of a system can be derived from stars kinematic data. Kinematic data that commonly used to determine mass is radial velocity because radial velocity data can be well defined on objects such as galaxies or galaxy clusters. But virial method has <br />
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several shortcomings such as biased results caused by how many samples are used. Therefore there are an alternative method of determining mass other than using virial theorem, one of them is projected mass estimator, this method utilizes two kinematic components in the radial and tangential direction to estimate the mass of star cluster. Simulated star cluster model is used to test the mass determination method used in this study. In addition, this model can be used to estimate how big the error is in determining the mass, this simulation can also be used to see what factors that could influence the errors in the mass determination. <br />
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Using both methods has been calculated the mass of open star clusters NGC 2168, NGC 188, and NGC 6819. From the result turn out the virial method that using radial velocity data only give much more reasonable mass. From <br />
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virial method the mass of open star clusters ranged from ~3000 to ~4500 solar mass, and using projected mass the mass is higher than ~25000 solar mass. <p align="justify"> |
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