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My star is 2.17 Solar masses. For narrative purposes, I decided this so it will collapse in the theoretical Quark star. Could such a big star that isn't on the main sequence (Because it is class A, not class B) be stable and able to sustain 10 planets, some of which sustain life? Or would the UV output be too high for atmospheric retention due to habitability distance?

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    $\begingroup$ What is atmospheric retention of U light??? $\endgroup$ – RonJohn Jul 11 at 7:40
  • $\begingroup$ Uv light output by the Sun, Atmospheric retention of planets. It is said that atmospheres evaporate with the hot temperatures and a lot of UV light the sun gives $\endgroup$ – SPYRX Jul 11 at 7:45
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    $\begingroup$ Why would it not be on the main sequence? Spectralclass A and B are on the main sequence. As long it isn't a B or O star planets are plausabile, since those two spectral classes evaporate their protoplanetary discs before planet formation can happen. 10 planets are fine if they are spaced out properly or better yet in resonances. UV will be hard on life and it may never leave the few habitable worlds oceans. $\endgroup$ – TheDyingOfLight Jul 11 at 8:04
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    $\begingroup$ Hi, @SPYRX, welcome to Worldbuilding! Can you please clarify your question (and title)? I see 3 questions here - "Would this system be gravitationally stable?", "Would planets of A-type star be able to support life?" and "Would A-star planetary system survive its star collapse (potentially through a supernova explosion)?" $\endgroup$ – Alexander Jul 11 at 16:56
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    $\begingroup$ 2.17 solar masses is fairly small; you'd need a star of 8 solar masses - minimum - to undergo a supernova that could form your quark star. $\endgroup$ – HDE 226868 Jul 12 at 18:04