Worksheet: Stellar Classification

In this worksheet, we will practice classifying stars according to their surface temperature and identifying the spectral class of stars.

Q1:

Which class of star has a lower surface temperature, a K-type star or an F-type star?

  • AA K-type star
  • BAn F-type star

Q2:

Which has a lower surface temperature, a G3 star or a G5 star?

  • AA G3 star
  • BA G5 star

Q3:

Sirius A is a blue-white star with a surface temperature of 9,940 K. What is the stellar class of Sirius A?

  • AM
  • BO
  • CB
  • DK
  • EA

Q4:

Which has a higher surface temperature, an A2 star or an A8 star?

  • AAn A2 star
  • BAn A8 star

Q5:

What is the stellar class of a star that is blue in color and has a surface temperature of 32,000 K?

  • AF
  • BB
  • CM
  • DO
  • EA

Q6:

What is the stellar class of a star that is light orange in color and has a surface temperature of 4,500 K?

  • AB
  • BF
  • CK
  • DM
  • EG

Q7:

The table shows the stellar classes of several nearby stars.

StarEpsilon EridaniTau CetiTeegarden’s StarSirius A
ClassKGMA

Which star has the highest surface temperature?

  • ATeegarden’s Star
  • BSirius A
  • CTau Ceti
  • DEpsilon Eridani

Which star has the lowest surface temperature?

  • ATeegarden’s Star
  • BEpsilon Eridani
  • CTau Ceti
  • DSirius A

Q8:

Which class of star has a higher surface temperature, a B-type star or a G-type star?

  • AA B-type star
  • BA G-type star

Q9:

Alpha Centauri A is a yellow-white star with a surface temperature of 5,790 K. What is the stellar class of Alpha Centauri A?

  • AM
  • BF
  • CA
  • DG
  • EK

Q10:

StarLuyten 726-8 BEpsilon EridaniRoss 12861 Cygni A61 Cygni B
ClassM6K2M4K5K7

The table shows the stellar classes of several nearby stars.

Which star has the highest surface temperature?

  • A61 Cygni B
  • BLuyten 726-8 B
  • C61 Cygni A
  • DRoss 128
  • EEpsilon Eridani

Which star has the lowest surface temperature?

  • A61 Cygni B
  • BRoss 128
  • CLuyten 726-8 B
  • D61 Cygni A
  • EEpsilon Eridani

Q11:

The diagram shows the color and surface temperature of a star. What is the stellar class of the star?

  • AG
  • BB
  • CF
  • DK
  • EA

Q12:

The table shows the stellar classes of several stars.

StarEpsilon EridaniRoss 128VegaBellatrixMintaka
ClassK2M4A0B2O9

Which star is most likely to have the greatest mass?

  • AEpsilon Eridani
  • BBellatrix
  • CMintaka
  • DRoss 128
  • EVega

Which star is most likely to have the smallest mass?

  • ARoss 128
  • BMintaka
  • CBellatrix
  • DEpsilon Eridani
  • EVega

Q13:

The diagram shows the color and surface temperature of a star. What is the stellar class of the star?

  • AG
  • BO
  • CK
  • DF
  • EM

Q14:

Each of the following diagrams shows the color and surface temperature of a star. Which diagram shows a G-type star?

  • A
  • B
  • C
  • D
  • E

Q15:

Each of the following diagrams shows the color and surface temperature of a star. Which diagram shows an A-type star?

  • A
  • B
  • C
  • D
  • E

Q16:

Each of the following diagrams shows the color and surface temperature of a star. Which diagram shows a B-type star?

  • A
  • B
  • C
  • D
  • E

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