What is the region of the Hertzsprung-Russell diagram known as the "horizontal branch"?

0 votes
    It is a region of the H-R diagram, along which stars can be found to be arranged as they undergo helium core fusion.
     It is the track followed by low-mass stars as they evolve off the main sequence, before their helium flash.
     It is the track followed by high-mass stars as they undergo progressive fusion of different nuclei.
     It is the track followed by low-mass stars as they age between their helium flash and the point at which their planetary nebula has been ejected.
     It is the path in the H-R diagram followed by white dwarf stars as they age.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

0 votes
It is a region of the H-R diagram, along which stars can be found to be arranged as they undergo helium core fusion.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



...