•Q7-9: Stellar spectral classification:
•Properties Star Temp (K)
•Medium-strength Balmer lines, strong neutral helium
lines = 20,000K
•Medium-strength Balmer lines, weak ionized calcium lines
= 7500 K
•Strong TiO bands = 3000 K
•Weak Balmer lines, strong ionized helium lines = 40,000 K
•
•Q10 If star A has
a temperature of 4000 Kelvin and star B has a temperature of twice
that, or 8000 Kelvin, how much more energy does it radiate
per second than star A?
•E goes as T to
the 4th power, so 24 = 16 times.