# Luminosity value to use for the calculation of the habitable zone?

I'm currently studying the star system of Gliese 570 and I´m trying to calculate the habitable zone of the component A from the luminosity value in relation of the Sun´s. I´ve read that the needed value of luminosity is the value of the bolometric luminosity (here 26%), but the calculations of the HZ that I found is about 0.40 AU, which seems to be calculated from the visual luminosity (about 16%).

So, the questions are: Which of these 2 values do I have to use to calculate the habitable zone? Does the stellar class of the star affect the selection of it?

• It might help to ask the following question: which parts of the EM spectrum are responsible for most of the heat? May 27, 2017 at 18:01
• Could you post your source for what you found at about .40 AU. There might be an explanation or it might be a questionable source. Loosely speaking, you should use the bolometric luminosity for estimates, but there's other factors like atmospheric reflectivity of longer-wavelength light and a fairly wide range of atmospheres with different heat capacity and greenhouse gas content. If nobody answers this I could cover the basics. Also a HZ should be a range, not a single number. May 28, 2017 at 11:50
• I'm not expert enough to give an answer that this question deserves, but: I'm pretty sure that most references give stellar bolometric luminosity relative to the sun. The effective temperature of a planet is a function of this luminosity. semi-major axis and albedo. The habitable zone, of course, has been designated as where liquid water can exist on the surface of a planet, which depends on greenhouse, etc. Essentially, it is a range of effective temperatures determined by bolometric luminosity. May 30, 2017 at 2:44
• As an aside, I am designing planetary systems for fun and a science fiction project. I find it easiest to use formula with all values relative to the Earth and the Sun (T(eff) of Earth is about 255K). I use a bond albedo for Earth of 0.3. May 30, 2017 at 2:57
• stellar-database.com/Scripts/… May 30, 2017 at 16:11