Question 1

Paper 2Easy9 marks

Figure 1 is a schematic Hertzsprung–Russell (HR) diagram. The regions are labelled A–D, and the positions of the Sun and star X are shown.

Luminosity, L/L☉30 00010 0005000300010−410−21102104106Surface temperature, T / KDBCASunX
(a)

Identify the stellar type represented by each of the regions A, B, C and D in Figure 1.

[4]
(b)

Using Figure 1, compare the surface temperature and luminosity of star X with those of the Sun.

[2]
(c)

Stars P and Q are both on the main sequence. P has a greater mass than Q. State which star has the shorter main-sequence lifetime.

[1]
(d)

State the likely final remnant of a low-mass star and of a high-mass star.

[2]

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