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ladybug1829
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Please Help :)
"Calcium H and K lines have rest frame wavelengths of 3968.5 A (angstrom). Spectroscopy of 5 stars in a cluster revealed that the Ca H line was detected at
3970.1 A
3966.3 A
3967.5 A
3971.0 A
3968.2 A
in each of these five stars. Calculate the line of sight velocity dispersion of the cluster in km/sec. The rms of the proper motions of these 5 stars was measured to be 1.3 arcseconds / year. Calculate the distance to the star cluster.
"Calcium H and K lines have rest frame wavelengths of 3968.5 A (angstrom). Spectroscopy of 5 stars in a cluster revealed that the Ca H line was detected at
3970.1 A
3966.3 A
3967.5 A
3971.0 A
3968.2 A
in each of these five stars. Calculate the line of sight velocity dispersion of the cluster in km/sec. The rms of the proper motions of these 5 stars was measured to be 1.3 arcseconds / year. Calculate the distance to the star cluster.
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