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Thread: A young double double

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    Default A young double double



    upfyrman, ssocal, KathyNS and 12 others like this.
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    Default Re: A young double double

    Extraordinary! I think 7 stars in one system is the most discovered so far? And that would be a very complex system, yes?
    Jim

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    Default Re: A young double double

    Quote Originally Posted by not_Fritz_Argelander View Post
    Not so long ago the thought of planet in a binary system was thought impossible. Now we are hunting one with confidence in a double double system
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    Default Re: A young double double

    Quote Originally Posted by Solrian View Post
    Extraordinary! I think 7 stars in one system is the most discovered so far? And that would be a very complex system, yes?
    It suggests a nomenclature problem which is not likely to have a good solution: when is a group of stars that are gravitationally bound a large multiple system and when a cluster?
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    Default Re: A young double double

    Quote Originally Posted by not_Fritz_Argelander View Post
    It suggests a nomenclature problem which is not likely to have a good solution: when is a group of stars that are gravitationally bound a large multiple system and when a cluster?
    Dwarf cluster. Done.

    But only if it hasn't cleared it's orbit...
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    Default Re: A young double double

    Quote Originally Posted by not_Fritz_Argelander View Post
    It suggests a nomenclature problem which is not likely to have a good solution: when is a group of stars that are gravitationally bound a large multiple system and when a cluster?
    Would it not be defined by the barycenter of the cluster
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    Default Re: A young double double

    In the case of Castor, which has six components, there are three close binaries, and two of these pairs orbit their common centre, with the third pair orbiting them at a much greater distance. This suggests that a multiple system has a hierarchy of pairs, while a cluster has everything following its own arbitrary orbit. I don't know of any other way to arrange things.

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    Default Re: A young double double

    Quote Originally Posted by MG1692 View Post
    Would it not be defined by the barycenter of the cluster
    It’s not clear to me how a barycenter permits making a distinction between a cluster and a multiple star system. What are your thoughts?

    I’m thinking that a multiple star system would have orbits that could be arranged in a hierarchy of Kepler two body problems. For instance a double double like this system or eps Lyr. Or a triple of doubles like Castor.

    A cluster otoh would not have orbits that decompose into a hierarchy of two body problems and so would be less stable.
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    Default Re: A young double double

    Here’s the apparent consensus view on the matter https://en.m.wikipedia.org/wiki/Star_system

    It’s a little different from what I was taught. As an undergrad I referred to the Trapezium as a multiple star system and was corrected that it was really a small cluster. The line separating large multiple systems from clusters seems vague.
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