A
astronomy44
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a. It is a region of the H-R diagram along which stars can be found to be arranged as they undergo helium core fusion.
b. 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.
c. It is the path in the H-R diagram followed by white dwarf stars as they age.
d. It is the track followed by Sun-like stars as they evolve off the main sequence, after they become subgiants and before their helium flash.
e. It is the track followed by high-mass stars as they undergo progressive fusion of different nuclei.
b. 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.
c. It is the path in the H-R diagram followed by white dwarf stars as they age.
d. It is the track followed by Sun-like stars as they evolve off the main sequence, after they become subgiants and before their helium flash.
e. It is the track followed by high-mass stars as they undergo progressive fusion of different nuclei.