Regents Earth Science

John Dewey High School

Mr. Klimetz

Luminosity and Temperature of Stars

Reading the Earth Science Reference Tables XIV

Answer the following questions based on your interpretation of the Luminosity and Temperature of Stars chart of the Earth Science Reference Tables (page 15) as well as your class notes.

1.   The approximate temperature of the Sun (in degrees C) is

a.  5,000   b.  5,700   c.  10,000  d.  14,300  

2.   Which star is the standard of luminosity against which all other stars are

compared?

a.  Rigel   b.  Polaris  c.  Alpha Centauri   d.  Sun

3.   I am a star with a temperature approximately twice that of the Sun and a luminosity

approximately 1/10,000th of Aldebaran. I belong to the group of stars known as

a.  Supergiants   b.  Main Sequence Stars   c.  White Dwarfs   d.  Red Dwarfs

4.   Which of the following statements is false?

a.  The Sun is a member of the Main Sequence star group.

b.  Blue Supergiants are the coolest of the Main Sequence star group.

c.  Red Giants are brighter than Procyon B.

d.  Alpha Centauri is a yellow star.

5.   Which stars are shown in the correct order from dimmest to brightest?

a.  Barnard’s Star - Sirius - Rigel -  Betelgeuse

b.  Sun - Alpha Centauri - Polaris - Rigel

c.  Procyon B - Sun - Aldebaran - Barnard’s Star

d.  Rigel - Polaris - Sun - Barnard’s Star

6.   Which of the following statements concerning Main Sequence stars is true?

a.  Blue stars are cool and bright, red stars are hot and dim.

b.  Blue stars are hot and dim, red stars are cool and bright.

c.  Red stars are cool and dim, blue stars are hot and bright.

d.  Red stars are cool and dim, blue stars are cool and dim.

7.   Which of the following possesses the highest relative temperature?

a.  Sun   b.  Polaris  c.  Alpha Centauri   d.  Aldebaran

8.   I am a star with an orange color. I have a luminosity approximately 100 times that of the Sun. My

name is

a.  Rigel   b.  Betelgeuse   c.  Aldebaran   d.  Barnard’s Star

9.   Which expresses the observed relationship between temperature, brightness, and color of Main

Sequence stars?

a.  Red stars are hot and dim whereas blue stars are cool and bright.

b.  Red stars are cool and dim whereas blue stars are hot and dim.

c.  Red stars are cool and bright whereas blue stars are hot and bright.

d.  Red stars are cool and dim whereas blue stars are hot and bright.