Spectral Classification Quiz

In the Harvard system, which spectral class comes first in order of decreasing temperature?

• M

• G

• O

What information does the spectral class in the Harvard system primarily indicate?

• Luminosity

• Age

• Surface temperature

• Composition

In the Yerkes system, what additional information is provided by the luminosity class compared to the Harvard system?

• Age

• Composition

• Star's relative brightness

• Size

Which spectral class represents the hottest stars in the Yerkes system?

• G

• K

• O

• M

Which spectral class in the Yerkes system typically represents red giants?

• O

• B

• A

• M

Which Yerkes luminosity class represents supergiants?

• I

• II (Roman numeral one)

• III

• V

What is the difference between a star classified as O5V and a star classified as B3III in the Yerkes system?

The O5 star is hotter and brighter than the B3 star.

• True

• False

They are both main sequence stars.

• True

• False

They have the same luminosity class.

• True

• False