Three M-class stars are identified as being main-sequence, giant, and supergiant stars, respectively. In what physical property do they differ?

0 votes
     color index
      luminosity
      surface temperature
      parallax
      spectral class
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

0 votes
luminosity
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



...