I am writing a science fiction book that includes the idea of a planet orbiting within the habitable zone of Alpha Centauri A and I'm hoping this is a good place to get some questions answered. It's science fiction, so I'm perfectly fine with stretching the limits of possibility, here, just want it to be somewhat believable. As I understand it, a planet orbiting Alpha Centauri A would have B constantly in it's sky for much of the year, even during "night". So my first question, what would that be like? I know that B is less bright, so would it still get dark, like a night with a very bright moon? Maybe a state of constant twilight? How long would this last? Also, what would it do to the weather? Would B give off enough heat to make a significant different in the temperature? Would one sun be yellow and one red, or am I confused on their types? How would Proxima come in to play? Sorry for all of the questions, but thank you for any answers. I've looked at anything I could find on the internet, but since there haven't been any planets found in this system yet, there aren't many answers that I have been able to find.