<p>Why a mass transfer in a binary star system, from the less dense star to the denser star forms an accretion disk? Why the material does not fall directly to the denserstar?</p>

CC BY-SA 4.0
2021-05-21T07:29:16.593Z
Welcome to Astronomy SE! Although the question is a valid and interesting one, I would appreciate a bit more information, in particular on the background of your question (why you are asking) and what you know so far. In dubito pro reo, I just assume that it is not an exam question. For more guidance see [ask].
B--rian
CC BY-SA 4.0
2021-05-21T09:40:11.643Z
Because it is hard to get rid of angular momentum in space.. (i.e. https://www.youtube.com/watch?v=LHvR1fRTW8g "Why hitting the sun is hard")
AtmosphericPrisonEscape
CC BY-SA 4.0
2021-05-21T22:45:35.013Z
an accretion disk can form if the mass transfer is dynamically stable
Daddy Kropotkin
<gravity><binary-star><celestial-mechanics><accretion>
Accretion disk formation
Niche
# Accretion disk formation

(Asked by: username_0 on 2021-05-21)

Why a mass transfer in a binary star system, from the less dense star to the denser star forms an accretion disk? Why the material does not fall directly to the denserstar?

**Tags:** gravity, binary-star, celestial-mechanics, accretion
> **Comments:**
> **username_1**: Welcome to Astronomy SE! Although the question is a valid and interesting one, I would appreciate a bit more information, in particular on the background of your question (why you are asking) and what you know so far. In dubito pro reo, I just assume that it is not an exam question. For more guidance see [ask].  
> **username_2**: Because it is hard to get rid of angular momentum in space.. (i.e. https://www.youtube.com/watch?v=LHvR1fRTW8g "Why hitting the sun is hard")  
> **username_3**: an accretion disk can form if the mass transfer is dynamically stable  

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## 0 answers

