Fig. 1.1 is an incomplete Hertzsprung-Russell (HR) diagram of stars in our galaxy.
a.[2]
State the type of stars found in regions P and Q.
b.[2]
The Sun is a main-sequence star. Its surface temperature is 5780 K5780\text{ K}5780 K and the wavelength of the emitted radiation at maximum intensity is 500 nm500\text{ nm}500 nm. Vega is also a main-sequence star. The wavelength of the emitted radiation at maximum intensity from Vega is 300 nm300\text{ nm}300 nm.
Calculate the surface temperature of Vega. Give your answer to 3 significant figures.
c.[2]
State and explain whether the position of Vega on the HR diagram is to the left or to the right of the Sun along the main sequence.