Variable RR Lyrae stars | European Southern Observatory The video, based on observations made in the infrared with the VISTA infrared survey telescope shows the central region of the Milky Way galaxy. Several variable stars within the field of views are marked with circles. They can also be identified as they brighten and fade in regular intervals. At the end the video zooms on one of the newly discovered RR Lyrae stars (marked with a red circle), which are too faint to be seen clearly in the la
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Parallax measurements of the variable star RR Lyrae indicate that it is located 230 pc from the Sun. A similar star observed in a globular cluster located far above the galactic plane appears 160,000 times fainter than RR Lyrae. a. How far from the Sun is this globular cluster? b. What does your answer to part (a) tell you about the size of the galaxy's halo compared to the size of its disk? | Numerade
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The absolute visual magnitude of RR Lyrae variables is 0.6±0.3... | Filo
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