Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Absolute magnitude and luminosity

  1. Apr 14, 2015 #1
    Do two stars of the same absolute bolometric magnitude have the same absolute visual magnitude?

    If this is true; does this mean that two stars with the same power output have the same have the same bolometric magnitude and therefore same visual magnitude?
     
  2. jcsd
  3. Apr 14, 2015 #2
    When you say bolometric, it's about the radiation emitted at all wavelengths. Visual absolute magnitude, it's about the radiation emitted in the visible part of the spectrum. So you could have stars so hot that they emit the most of their radiation in the UV; for them, the bolometric magnitude would be much bigger than the visual magnitude. In the same way, cool stars would produce most of their radiation in the infrared and again, they would be barely visible (small absolute visual magnitude). It all depends on the surface temperature of the star.
     
  4. Apr 15, 2015 #3
    Thank you this has filled the gap in my knowledge :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook