<p>This is a highly uncertain prospect, since the physics of the system itself relies on processes that are themselves uncertain to varying degrees, e.g., stellar nuclear evolution of very high-mass stars, accretion of gas onto compact objects, etc...</p>
<p>A relevant paper, cited by the <a href="https://en.wikipedia.org/wiki/Quasi-star" rel="nofollow noreferrer">wiki</a> article for quasistars, is the work by <a href="https://arxiv.org/abs/0711.4078" rel="nofollow noreferrer">Begelman</a> <span class="math-container">$\it{et~al.}$</span> (2007). They show that newly formed quasistars should have surface temperatures higher than 10,000 K (9,700 °C). As a quasistar cools over time to a limiting temperature of 4,000 K (3,730 °C), for metal-free (Population III) opacities, at and below which hydrostatic equilibrium is no longer sustainable, the end of the quasistar's life leaves behind an <a href="https://en.wikipedia.org/wiki/Intermediate-mass_black_hole" rel="nofollow noreferrer">intermediate-mass black hole</a>.</p>
<p>Such quasistars would have a <a href="https://arxiv.org/abs/1305.5923" rel="nofollow noreferrer">short</a> lifespan, at most ~ 7 Myrs, during which the core black-hole would grow into an intermediate-mass black hole which are suspected to be the progenitors of current-epoch supermassive black holes. This implies that quasistars are transient, and so observing them directly would be very difficult. However, it is possible that we could observe indirect effects of their existence on their environments, for example this is how we infer the existence of <a href="https://en.wikipedia.org/wiki/Common_envelope" rel="nofollow noreferrer">common envelope evolution</a>, or on the <a href="https://academic.oup.com/mnras/article/409/3/1022/1097516" rel="nofollow noreferrer">evolution</a> of intermediate-mass black holes.</p>

CC BY-SA 4.0
2021-05-17T14:09:03.533Z
2021-05-17T17:31:19.520Z
2021-05-17T17:31:19.520Z
Daddy Kropotkin
<p>I've heard about quasi stars a while ago, but I've just recently decided to go more in-depth about the characteristics and facts about them. I learned that they gain their energy through radiation when matter falls into the black hole in the core. I may be wrong about this part, though. I also learned that they can't exist these days because the universe's gases are polluted with metals. Why does that stop quasi stars from existing?</p>
<p>Edit request from comment: A quasi star is a hypothetical star that existed in the early ages of the universe. It got its energy from a black hole at its core, unlike normal stars that get energy through nuclear fusion.</p>
<p><a href="https://medium.com/predict/quasi-stars-black-holes-at-the-core-of-the-universes-largest-stars-38bfbc4e1b95" rel="nofollow noreferrer">https://medium.com/predict/quasi-stars-black-holes-at-the-core-of-the-universes-largest-stars-38bfbc4e1b95</a></p>
<p>If you would like more specifications, please tell me</p>

<star>
Why is it impossible for a Quasi Star to exist these days?
chowder
# Why is it impossible for a Quasi Star to exist these days?

(Asked by: username_0 on 2021-05-17)

I've heard about quasi stars a while ago, but I've just recently decided to go more in-depth about the characteristics and facts about them. I learned that they gain their energy through radiation when matter falls into the black hole in the core. I may be wrong about this part, though. I also learned that they can't exist these days because the universe's gases are polluted with metals. Why does that stop quasi stars from existing?

Edit request from comment: A quasi star is a hypothetical star that existed in the early ages of the universe. It got its energy from a black hole at its core, unlike normal stars that get energy through nuclear fusion.

<https://medium.com/predict/quasi-stars-black-holes-at-the-core-of-the-universes-largest-stars-38bfbc4e1b95>

If you would like more specifications, please tell me

**Tags:** star


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## 1 answers

### Answer by username_1 on 2021-05-17. Score: 3 | Accepted answer

This is a highly uncertain prospect, since the physics of the system itself relies on processes that are themselves uncertain to varying degrees, e.g., stellar nuclear evolution of very high-mass stars, accretion of gas onto compact objects, etc...

A relevant paper, cited by the [wiki](https://en.wikipedia.org/wiki/Quasi-star) article for quasistars, is the work by [Begelman](https://arxiv.org/abs/0711.4078) $\it{et~al.}$ (2007). They show that newly formed quasistars should have surface temperatures higher than 10,000 K (9,700 °C). As a quasistar cools over time to a limiting temperature of 4,000 K (3,730 °C), for metal-free (Population III) opacities, at and below which hydrostatic equilibrium is no longer sustainable, the end of the quasistar's life leaves behind an [intermediate-mass black hole](https://en.wikipedia.org/wiki/Intermediate-mass_black_hole).

Such quasistars would have a [short](https://arxiv.org/abs/1305.5923) lifespan, at most ~ 7 Myrs, during which the core black-hole would grow into an intermediate-mass black hole which are suspected to be the progenitors of current-epoch supermassive black holes. This implies that quasistars are transient, and so observing them directly would be very difficult. However, it is possible that we could observe indirect effects of their existence on their environments, for example this is how we infer the existence of [common envelope evolution](https://en.wikipedia.org/wiki/Common_envelope), or on the [evolution](https://academic.oup.com/mnras/article/409/3/1022/1097516) of intermediate-mass black holes.


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