The survival of stellar clusters
(2014) In Lund Observatory Examenasarbeten ASTK01 20141Department of Astronomy and Theoretical Physics - Has been reorganised
Lund Observatory - Has been reorganised
- Abstract
- In this project I have studied the effect of gas expulsion on the evolution of stellar clusters.
What effect the rate of gas removal and the quantity of gas removed has on the evolution
on the cluster will be studied through computer simulations with the NBody6 code and
compared to analytical predictions. The rate at which gas is removed has a very significant
impact on how the cluster evolves and it is particular relevant to look at rates compared to
the crossing time-scale of the cluster. Having small timescales of gas removal on the order
(τg << τc) can disrupt a cluster, while if the timescale is large (τg >> τc) the cluster can
recover equilibrium internally.
How much initial gas is needed in order for the cluster to... (More) - In this project I have studied the effect of gas expulsion on the evolution of stellar clusters.
What effect the rate of gas removal and the quantity of gas removed has on the evolution
on the cluster will be studied through computer simulations with the NBody6 code and
compared to analytical predictions. The rate at which gas is removed has a very significant
impact on how the cluster evolves and it is particular relevant to look at rates compared to
the crossing time-scale of the cluster. Having small timescales of gas removal on the order
(τg << τc) can disrupt a cluster, while if the timescale is large (τg >> τc) the cluster can
recover equilibrium internally.
How much initial gas is needed in order for the cluster to completely unbind after a
very rapid period of gas removal is another question investigated. If the mass of the gas
exceeds around 7 times the mass of the stars the clusters seem to completely fall apart.
The events of a SN is a possible source of rapid gas removal very shortly after a cluster
is formed. From many of the simulations less dense clusters seem to emerge from the
remnants. The fraction of mass left in the cluster with rapid removal depends a lot on the
initial amount of gas mass. For medium amount of gas (Mg ∼ (1−5)Ms) the mass fraction
of the remnant can be to some extent approximated by a Mrem/Mini ∼ Mg^(−1/2) function.
The primordial binary rate could have an effect on the evolution, but the simulations suggest
that it is not a dominant one. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/4465624
- author
- Arvidsson, Tobias LU
- supervisor
-
- Ross Church LU
- organization
- course
- ASTK01 20141
- year
- 2014
- type
- M2 - Bachelor Degree
- subject
- publication/series
- Lund Observatory Examenasarbeten
- report number
- 2014-EXA83
- language
- English
- id
- 4465624
- date added to LUP
- 2014-06-30 12:10:55
- date last changed
- 2014-06-30 12:10:55
@misc{4465624, abstract = {{In this project I have studied the effect of gas expulsion on the evolution of stellar clusters. What effect the rate of gas removal and the quantity of gas removed has on the evolution on the cluster will be studied through computer simulations with the NBody6 code and compared to analytical predictions. The rate at which gas is removed has a very significant impact on how the cluster evolves and it is particular relevant to look at rates compared to the crossing time-scale of the cluster. Having small timescales of gas removal on the order (τg << τc) can disrupt a cluster, while if the timescale is large (τg >> τc) the cluster can recover equilibrium internally. How much initial gas is needed in order for the cluster to completely unbind after a very rapid period of gas removal is another question investigated. If the mass of the gas exceeds around 7 times the mass of the stars the clusters seem to completely fall apart. The events of a SN is a possible source of rapid gas removal very shortly after a cluster is formed. From many of the simulations less dense clusters seem to emerge from the remnants. The fraction of mass left in the cluster with rapid removal depends a lot on the initial amount of gas mass. For medium amount of gas (Mg ∼ (1−5)Ms) the mass fraction of the remnant can be to some extent approximated by a Mrem/Mini ∼ Mg^(−1/2) function. The primordial binary rate could have an effect on the evolution, but the simulations suggest that it is not a dominant one.}}, author = {{Arvidsson, Tobias}}, language = {{eng}}, note = {{Student Paper}}, series = {{Lund Observatory Examenasarbeten}}, title = {{The survival of stellar clusters}}, year = {{2014}}, }