Worksheet: Classifying Stars by Brightness and Temperature

In this worksheet, we will practice classifying stars according to their brightness (or absolute magnitude) and their temperature (using their color).

Q1:

An astronomer looks at the light coming from two stars: star A and star B. Star B is emitting bluer light than star A. Which star is hotter?

  • AStar B
  • BStar A

Q2:

The table shows the absolute magnitudes of several nearby stars.

Star Gliese 687 Epsilon Eridani Ross 614 Procyon A
Absolute Magnitude 10.9 6.2 16.2 2.7

Which star is the brightest?

  • AProcyon A
  • BGliese 687
  • CRoss 614
  • DEpsilon Eridani

Which star is the dimmest?

  • AEpsilon Eridani
  • BGliese 687
  • CProcyon A
  • DRoss 614

Q3:

The lower the value of the absolute magnitude of a star, the that star is. The higher the value of the absolute magnitude of a star, the that star is.

  • Afurther, closer
  • Bdimmer, brighter
  • Cdimmer, cooler
  • Dbrighter, hotter
  • Ebrighter, dimmer

Q4:

The diagram shows the axes for a Hertzsprung-Russell diagram and four regions within the diagram.

What types of stars are found in region A?

  • AMain sequence stars
  • BWhite dwarfs
  • CRed supergiants
  • DRed giants
  • EBlack holes

What types of stars are found in region B?

  • AWhite dwarfs
  • BMain sequence stars
  • CNeutron stars
  • DRed giants
  • ERed supergiants

What type of stars are found in region D?

  • ANeutron stars
  • BMain sequence stars
  • CRed giants
  • DWhite dwarfs
  • EBlack dwarfs

Q5:

The table shows the colors and absolute magnitudes of some nearby stars.

Star Absolute Magnitude Color
Proxima Centauri 15.5 Orange
Sirius A 1.4 Blue
Procyon B 13.0 Yellow
Gliese 832 10.2 Red

Which star is the hottest?

  • AGliese 832
  • BSirius A
  • CProcyon B
  • DProxima Centauri

Which star is the coolest?

  • AGliese 832
  • BProxima Centauri
  • CProcyon B
  • DSirius A

Which star is the brightest?

  • ASirius A
  • BProcyon B
  • CProxima Centauri
  • DGliese 832

Which star is the dimmest?

  • AGliese 832
  • BProcyon B
  • CSirius A
  • DProxima Centauri

Q6:

The higher the surface temperature of a star is, the the light coming from it. The lower the surface temperature of a star is, the the light coming from it.

  • Abluer, redder
  • Bbluer, bluer
  • Credder, greener
  • Dgreener, bluer
  • Eredder, bluer

Q7:

Star A has an absolute magnitude of 13.1 and Star B has an absolute magnitude of 2.8. Which star is brighter?

  • AStar A
  • BStar B

Q8:

The diagram shows six stars. Each star is colored approximately according to the light that it emits. List the stars in order from lowest to highest temperature.

  • A(e), (a), (b), (d), (f), (c)
  • B(e), (a), (d), (b), (f), (c)
  • C(c), (e), (a), (d), (b), (f)
  • D(f), (e), (a), (d), (b), (c)
  • E(e), (a), (d), (b), (c), (f)

Q9:

The diagram shows six stars. Each star is colored approximately according to the light that it emits.

Which star is the hottest?

  • A(a)
  • B(d)
  • C(c)
  • D(b)
  • E(f)

Which star is the coolest?

  • A(a)
  • B(b)
  • C(e)
  • D(d)
  • E(f)

Which star emits light that is most similar to the Sun?

  • A(d)
  • B(a)
  • C(c)
  • D(b)
  • E(f)

Q10:

Two stars, 𝐴 and 𝐵, are known to have the same brightness. When observed by an astronomer on Earth, however, star 𝐵 appears brighter than star 𝐴. Which star is farther away from Earth?

  • AStar 𝐴
  • BStar 𝐵

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