The section of the H–R diagram where the Cepheid variables reside is the a.birth line. b.zero-age main sequence. c.instability strip. d.horizontal branch. e.white dwarf region.

One of the most important tool in study of stellar evolution is the Hertzsprung-Russell diagram(HR…

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	a.	birth line.
	b.	zero-age main sequence.
	c.	instability strip.
	d.	horizontal branch.
	e.	white dwarf region.

The section of the H–R diagram where the Cepheid variables reside is the a. birth line. b. zero-age main sequence. c. instability strip. d. horizontal branch. e. white dwarf region.