Sorry if this is in the wrong section, but its not really homework, just curiosity. I'm a high school student struggling to understand a paper given to me, and search engines don't provide good starting points unless I have a more exact search query. The research is on star formation, investigating factors such as ionization pressure, radiation pressure and supernovae. Now some questions.. Could someone explain stellar output? Does it have to do with heat or luminosity, and would it have any correlation to the mass of the star? Could someone also explain what HII fraction would be? Does it have to do with diffuse fraction (or reflection)? I believe it is ionized hydrogen, but I'm not sure about anything else. Also, would anyone have a good starting point for understanding the dynamics of supernovae? Sharing any general knowledge on these topics would be great too! Thanks in advance!