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Thread: CWBP 2 : Astrophysics

  1. #71
      EpicSpire is offline
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    Quote Originally Posted by su_liam View Post
    The mass-luminosity relationship on your star is badly cockeyed. A star with a mass of 4.29 Sols should have a luminosity of much more than 4.29. As a rule of thumb, I use L = M^3.5.

    For planets with the same insolation, larger stars should have longer years. I'm not even sure if a mass of 4.29 Sols would have a sufficiently long life to evolve complex.. life.
    Thanks for pointing that out, Universe Sandbox does have the Mass to Luminosity option and for some reason i have it unchecked. but as far as i understand, Larger stars burn more quickly and will die faster than smaller ones,.. which is why White Dwarfs have to be older than the current age of the universe in order to actually burn white. correct me if i'm wrong or misread your statement.

    Quote Originally Posted by Azelor View Post
    Thanks, I already know about that software but not that a second version is coming.

    You planet is not in the habitable zone, it will be cooked like a roasted chicken in no time.
    The planet is in the habitable zone. it is far enough from the planet to have a temperature of 63F. and is within the Habitable zone that the program calculates when that option is selected for viewing. what makes you think it isn't?

  2. #72
      Azelor is online now
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    Your orbital period is 300 days, it's shorter than our own and usually mean that the planet is closer to the star.

    I could verify the distance but I think it's too close the be in the habitable zone considering the brightness of the star.


    Is it possible that you star is not a main sequence star?
    because I can't find a class that match all your informations: http://en.wikipedia.org/wiki/Stellar_classification

    mass: B
    diameter: M
    Density: your density is 115 times the Sun density. It's possible to have main sequence stars denser than the Sun but not that much.
    temp: B
    lum: B
    color: A or B

    Most of your informations seems to point out to a B star class. If you increase the diameter, normally, the density will get smaller and you will be able to match the average B star size. But with universe sandbox, it's always hard to get the numbers right because of how the sliders work.


    And at that distance your people are gonna die fast. Try with Sirius as an example, it's over 300 degrees. The planet is about 1/3 of the way from the habitable zone.
    Last edited by Azelor; 06-15-2014 at 06:32 PM.

  3. #73
      EpicSpire is offline
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    Quote Originally Posted by Azelor View Post
    Your orbital period is 300 days, it's shorter than our own and usually mean that the planet is closer to the star.

    I could verify the distance but I think it's too close the be in the habitable zone considering the brightness of the star.


    Is it possible that you star is not a main sequence star?
    ...
    Most of your informations seems to point out to a B star class. If you increase the diameter, normally, the density will get smaller and you will be able to match the average B star size. But with universe sandbox, it's always hard to get the numbers right because of how the sliders work.
    Thanks for the information, i'll run it through Universe Sandbox again, i did double check and the mass to luminosity checkbox was checked so there isn't a reason for the luminosity to be off by so much. I am not opposed to the star not being a main Sequence star, hell the system isn't even in our galaxy. I did originally plan the planet to orbit a white dwarf and it has always had a 300 day year, so i placed the planet at a 300 day orbit and adjusted the temp of the star until the planet reached 17.5 C. when i checked habitable zone, the planet was within the green rings (between the 2 bands not inside the inner band). although i just now re-looked up the mass of a white dwarf and saw that my mass is way off.. which had to be a slip of the slider, so again thanks for your information, still weird that the planet's orbit and temp isn't thrown off by the mass shift.


    Quote Originally Posted by Jalyha View Post
    I'm trying to force myself to look at believably the way a random reader of my books would... it's them *I* would have to convince with my own worlds.

    I'm simply trying the same viewpoint here

    Having questionable stuff is fine, as long as you've got the answers for it
    this is exactly how i feel when trying to come up with the system for my world. I'm glad i found this thread, and i will be willing to help out with anything i can, while using the knowledge/information i gain here for my own project. turning my game/book/story setting into something that provokes the Suspension of Disbelief is hard when you are as OCD about creative logic as I am.

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