1".3arc = (1.3/3600) degrees = (1.3/3600) X (TT / 180) Radians
= 6.302577854 X 10^-6 Radians
= proper motion / distance.
=> distance = proper motion / 6.302577854 X 10^-6 Radians
= 158,665.2356 X proper motion.
Derive the rms value of the five (divide by 5 to get mean square) that gives...
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"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...