•
• Question
13 (1 point) In the movie Blade Runner, replicant Roy Batty was compared to a candle: "A
candle that burns
twice as bright burns half as long." Star lifetimes are more complex than this (i.e.,the relationship is not linear). If the lifetime of a
star is half that of
the sun, how luminous is it?
a.1 solar luminosity b.2 solar
luminosities c.0.5 solar luminosities
d.1.3 solar luminosities e.2.6 solar luminosities
•
•Need to use L = M3.5 and Lifetime = M -2.5
•First,
Lifetime = ½ = (M) -2.5, solve to get M (1.3 solar masses)
•Plug
into the other equation to get 2.6 solar luminosities. Should work on the board.