# Worksheet: Classifying Stars by Brightness and Temperature

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

Which star is the hottest?

• A(d)
• B(a)
• C(f)
• D(c)
• E(b)

Which star is the coolest?

• A(e)
• B(b)
• C(d)
• D(a)
• E(f)

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

• A(b)
• B(a)
• C(f)
• D(d)
• E(c)

Q3:

The table shows the absolute magnitudes of several nearby stars.

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

Which star is the brightest?

• ARoss 614
• BGliese 687
• CEpsilon Eridani
• DProcyon A

Which star is the dimmest?

• AGliese 687
• BProcyon A
• CEpsilon Eridani
• DRoss 614

Q4:

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.

• Abrighter, hotter
• Bdimmer, brighter
• Cdimmer, cooler
• Dbrighter, dimmer
• Efurther, closer

Q5:

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

Q6:

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?

• ARed giants
• BMain sequence stars
• CRed supergiants
• DWhite dwarfs
• EBlack holes

What types of stars are found in region B?

• AMain sequence stars
• BRed supergiants
• CRed giants
• DWhite dwarfs
• ENeutron stars

What type of stars are found in region D?

• ABlack dwarfs
• BWhite dwarfs
• CRed giants
• DMain sequence stars
• ENeutron stars

Q7:

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?

• AProcyon B
• BProxima Centauri
• CGliese 832
• DSirius A

Which star is the coolest?

• ASirius A
• BProxima Centauri
• CProcyon B
• DGliese 832

Which star is the brightest?

• ASirius A
• BProxima Centauri
• CProcyon B
• DGliese 832

Which star is the dimmest?

• AProxima Centauri
• BGliese 832
• CSirius A
• DProcyon B

Q8:

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, bluer
• Bredder, bluer
• Credder, greener
• Dbluer, redder
• Egreener, bluer

Q9:

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

• AStar B
• BStar A