•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