Spectral Class Table

Question 1

What are the spectral classes in order of temperature?

Answer 1

O B A F G K M

Question 2

What is the colour and temperature range of an O spectral class?

Answer 2

Blue, 25000-50000K.

Question 3

What is the colour and temperature range of an B spectral class?

Answer 3

Blue, 11000-25000K.

Question 4

What is the colour and temperature range of an A spectral class?

Answer 4

Blue-white, 7500-11000K.

Question 5

What is the colour and temperature range of an F spectral class?

Answer 5

White, 6000-7500K.

Question 6

What is the colour and temperature range of an G spectral class?

Answer 6

Yellow-white, 5000-6000K.

Question 7

What is the colour and temperature range of an K spectral class?

Answer 7

Orange, 3500-5000K.

Question 8

What is the colour and temperature range of an M spectral class?

Answer 8

Red, <3500K.

Question 9

What are the prominent absorption lines for the O spectral class?

Answer 9

He+, He, H

Question 10

What are the prominent absorption lines for the B spectral class?

Answer 10

He, H

Question 10

What are the prominent absorption lines for the A spectral class?

Answer 10

H (strongest), ionised metals

Question 11

What are the prominent absorption lines for the F spectral class?

Answer 11

Ionised metals

Question 12

What are the prominent absorption lines for the G spectral class?

Answer 12

Ionised and neutral metals

Question 13

What are the prominent absorption lines for the K spectral class?

Answer 13

Neutral metals

Question 14

What are the prominent absorption lines for the M spectral class?

Answer 14

Neutral atoms, TiO