Astro Physics

Question 1

Give the properties of O class stars.

Answer 1

Colour - Blue
Temp Range - 25,000 - 50,000 (K)
Absorption Lines - He+, He, H
Prominence of H Balmer Lines - Weak

Question 2

Give the properties of B class stars.

Answer 2

Colour - Blue
Temp Range - 11,000 - 25,000 (K)
Absorption Lines - He, H
Prominence of H Balmer Lines - Slightly Stronger than O

Question 3

Give the properties of A class stars.

Answer 3

Colour - Blue/White
Temp Range - 7500 - 11,000 (K)
Absorption Lines - H, Ionised Metals
Prominence of H Balmer Lines - Strongest

Question 4

Give the properties of F class stars.

Answer 4

Colour - White
Temp Range - 6000 - 7500 (K)
Absorption Lines - Ionised Metals
Prominence of H Balmer Lines - Weak

Question 5

Give the properties of G class stars.

Answer 5

Colour - Yellow/White
Temp Range - 5000 - 6000 (K)
Absorption Lines - Ionised and Neutral Metals
Prominence of H Balmer Lines - None

Question 6

Give the properties of K class stars.

Answer 6

Colour - Orange
Temp Range - 3500 - 5000 (K)
Absorption Lines - Neutral Metals
Prominence of H Balmer Lines - None

Question 7

Give the properties of M class stars.

Answer 7

Colour - Red
Temp Range - <3500 (K)
Absorption Lines - Neutral Atoms, Titanium Oxide
Prominence of H Balmer Lines - None