Unit 7 - Unit 7 After the red giant stage a star approaches...

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Unit 7 After the red giant stage a star approaches the white dwarf stage. During this time it may undergo a period of _____. C.. Instability (nova, supernova). Most variable stars represent pre-giant stages. B.. Incorrect. The periods of variation in light output of certain classes of these stars are known to be related to their absolute magnitudes. D.. Variable stars. Most stars become variable stars _____ the red-giant stage. C. After. A variable star has an unpredictable period of brightening and dimming. Such a variable is call a(n) ______ variable. D.. irregular The Cepheid I variables in our galaxy are found only in the spiral arms. A.. Correct. As a class, the pulsating variables that have average absolute magnitude between -0.5 and -4 are _____. C.. Cepheid II. The period of Cepheid II stars range from _____. D.. 3 to 50 days. The pulsating variables, as a class, that have average absolute magnitude between -1.5 and -5, are ___. B.. Cepheid I. The period of RR Lyrae stars range from ____. B.. 0.3 to 0.7 days. Cepheid II stars are found _____. A.. In globular clusters. Another name for Cepheid I stars is _____. C. Classical Cepheids. Another name for Cepheid II stars is _____. A.. W Virginis Cepheids. RR Lyrae variables are denoted by _____. B.. B. Cepheid I variables are denoted by the letter _____. C.. C.
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Of the plots in the diagram, _____ shows the period-luminosity behavior for Cepheids. B.. B The plots in the diagram are called __ plots. B.. Period-luminosity. Galactic latitude is measured _____. A.. Perpendicular to the plane of the Milky Way The galactic coordinate measured in the plane of the Milky Way is galactic _____. B. Longitude. The reference direction for the galactic system is the _____. D. Galactic center. The Sun's motion in the galaxy is roughly _____. A.. On a circle centered at the galactic center. . The Sun's motion in the galaxy is toward the center of the galaxy.
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Unit 7 - Unit 7 After the red giant stage a star approaches...

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