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An overdensity of coeval stars compared to the galactic field 

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An overdensity of coeval stars compared to the galactic field 

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Star clusters are relevant for my research...

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Star clusters are relevant for my research...

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because they allow me to trace past star formation (in the absence of other possibilities) and offer possibilities to test the universality of the IMF.

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Star cluster: over-density of stars which are co-eval and co-moving.

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Star cluster: over-density of stars which are co-eval and co-moving.

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A dense (although I don't know what I mean by this) distribution of stars?

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A group of stars which were born together and exist in a coherent spatial+velocity structure

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moving together, similar age, contained in the same space in the sky

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group of star, sharing the same origin (age, composition etc)

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Cluster of stars is a group of stars or star populations that share a part of their life.

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can be defined as a group of young, co-mocinv stars.

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star cluster = stellar assemblages held together by the mutual gravitational attraction of its members

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star cluster = stellar assemblages held together by the mutual gravitational attraction of its members

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Group of stars which are more or less close to each other and that share some features, and have similar kinematics.

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A collection of stars which were born from the same event.

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Absolute:

A star cluster is a large group of coeval stars formed from the same molecular cloud.

Working:

A group of stars nearby which appear to be coeval.

I work with massive stars and feedback observational, and thus unavoidably work with stellar clusters a lot

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gravitationally bound group of stars

Fgas doesn’t have to be 0

Clusters are one of the oldest structures, understanding them helps us understand galaxy formation

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I'm not sure. I think that a star cluster would be either a group of stars that are gravitationally bound and/or participating in significant feedback with each other.

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Spatially and age correlated groups of stars (objectively maybe also gravitationally bound)

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A system of multiple stars that are gravitationally bound. Relevant to my research because of my interest in binary systems.

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Absolute: Gravitationally bound groups of stars with a common origin.

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Absolute: Gravitationally bound groups of stars with a common origin.

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Working: Stars close together on the plane of the sky moving in the same way.

Research: Research is on a forming high mass star cluster

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absolute definition: assembly of stars that are gravitaionally bound so that it is distnct from association and different from galaxy in terms of absense of dark matter.

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Gravitationally bound collection of stars originated from the same cloud and co-evolving, so they must also be linked by their kinematics

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Important for stellar evolution and galaxy formation 

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Important for stellar evolution and galaxy formation 

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A group of stars which formed around the same time and place.

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A bunch of coeval stars that share location in position and proper motion spaces

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Definition: A star cluster is a group of stars. They can be important because they can help us learn about distances a other stellar properties (bc. They all tend to have the same metallicity and age and distance from us)

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My working definition: a group of stars that are coeval, show similar proper motions and show a degree of sosyal concentration, with a central aggregation.

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My working definition: a group of stars that are coeval, show similar proper motions and show a degree of sosyal concentration, with a central aggregation.

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They provide an environment to study stars of the same age and obtain reliable mass estimates

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tracer of metallicity on some time ago for chemical evolution models for galaxies

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Absolute definition: aggregate of stars that is gravitationally bound and (a large fraction of its mass) remains so for timescales comparable to the lifetime of its host galaxy. 

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Absolute definition: aggregate of stars that is gravitationally bound and (a large fraction of its mass) remains so for timescales comparable to the lifetime of its host galaxy. 

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Working definition: aggregate of stars that can be considered as a single entity under some observational criteria: group velocity, age, spatial location, etc.

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They are relevant because they ionise the gas around them and their feedback shapes gas and dust morphology in the surroundings