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 G5 star
  • BA G3 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?

  • AB
  • BO
  • CM
  • DA
  • EK

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
  • BA
  • CB
  • DM
  • EO

Q6:

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

  • AF
  • BG
  • CK
  • DM
  • EB

Q7:

The table shows the stellar classes of several nearby stars.

Star Epsilon Eridani Tau Ceti Teegarden’s Star Sirius A
Class K G M A

Which star has the highest surface temperature?

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

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 G-type star
  • BA B-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?

  • AA
  • BG
  • CM
  • DF
  • EK

Q10:

Star Luyten 726-8 B Epsilon Eridani Ross 128 61 Cygni A 61 Cygni B
Class M6 K2 M4 K5 K7

The table shows the stellar classes of several nearby stars.

Which star has the highest surface temperature?

  • ALuyten 726-8 B
  • B61 Cygni B
  • C61 Cygni A
  • DRoss 128
  • EEpsilon Eridani

Which star has the lowest surface temperature?

  • A61 Cygni A
  • BRoss 128
  • CLuyten 726-8 B
  • DEpsilon Eridani
  • E61 Cygni B

Q11:

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

  • AG
  • BA
  • CB
  • DK
  • EF

Q12:

The table shows the stellar classes of several stars.

Star Epsilon Eridani Ross 128 Vega Bellatrix Mintaka
Class K2 M4 A0 B2 O9

Which star is most likely to have the greatest mass?

  • ARoss 128
  • BVega
  • CEpsilon Eridani
  • DMintaka
  • EBellatrix

Which star is most likely to have the smallest mass?

  • ABellatrix
  • BMintaka
  • CRoss 128
  • DVega
  • EEpsilon Eridani

Q13:

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

  • AO
  • BK
  • CM
  • DG
  • EF

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