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?
The number you need is the bolometric luminosity. This tells you how many Watts per square metre are incident upon the planet. That is true for the Sun and it is true for GL 570.

Beyond that, you will need to make assumptions about an atmosphere and an albedo if you are trying to calculate a realistic habitable zone. If you just assume the planet is like the Earth then using the same albedo value will probably do. But, because Gl 570 has a spectrum that peaks at 50% longer wavelengths than the Sun, then the albedo values at longer wavelengths are more important for a planet orbiting Gl 570. Whether that is bigger or smaller than the Earth would depend on exactly what sort of atmosphere/clouds/terrain were on the planet.