ASTR 105 Lecture Notes - Lecture 6: Effective Temperature, Globular Cluster, Apparent Magnitude
Lab AST 105 Lecture Notes 6:
• Relative to the Sun, red giants have:
• Larger Diameters
• The best way to determine the distance of a globular cluster is to use:
• RR Lyrae stars or the horizontal branch
• The initial onset of nuclear reactions in a star under formation occurs as the star:
• first approaches the ZAMS
• A bright Cepheid Variable has a period of just below 100 days. How far away in pc is such
a star whose Apparent Magnitudes +10: [Hint, see plot on p. 446 in Fix]
• 10,000 pc
• Compared to the Sun, most of the main sequence stars in the Milky Way are those which
are:
• Longer Lived (on the main sequence
• The life time of a star at each stage of its evolution is determined principally by its:
• mass
• and B stars are usually found in:
• young clusters and associations
• An A0 main sequence star (effective surface temperature ~ 10,000 K, see Fig. 16.20 in
Fix... e.g. the star just to the right of Regulus) has an apparent magnitude of +5. How far
away is this star in pc?
• 100 pc
• When nuclear reactions cease in star's interior, the star will definitely:
• contract
• Which of the following stellar types do not have continuous nuclear fusion reaction
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