Homework #6
Q2. Spectroscopic parallax. (Apparent)
magnitude = 5.4 for an O6 V star. How far
away is it? First need to get an absolute
magnitude. Can estimate it several ways
(H-R diagrams, mass-luminosity relation). I
used M = -5.6. So:
d (pc) = 10 (m-M+5)/5 = 103.2 = 1585 parsecs