GIZMOs - H-R Diagram - Complete Answer Key 100% COMPLETE SOLUTIONS DOWNLOAD TO SCORE OUTSTANDING GRADE A

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Student Exploration: H-R Diagram

Vocabulary: giant, H-R diagram, luminosity, main sequence, star, supergiant, white dwarf

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. The image at left shows three stars in the constellation

Orion: Betelgeuse (A), Mintaka (B), and Rigel (C). How do

the appearances of stars A, B, and C compare?

2. What are some ways the stars in the photo could be grouped

or classified?

Gizmo Warm-up

In the early 1900s, astronomers identified many star

characteristics such as color, size, temperature, and

luminosity—or how bright a star is. Using the H-R Diagram

Gizmo™, you will discover how some of these characteristics

are related.

Start by moving your cursor over the stars in the Star

collection. Star information is displayed on the right side of the

Gizmo. The numbers given for Luminosity, Radius, and Mass

are in comparison to the Sun. So, a star with a radius of “2

Suns” is twice as large as the Sun. Temperature is given using

the Kelvin scale, where 273.15 K = 0 °C and 373.15 K = 100 °C.

1. Find Betelgeuse in the Star collection. Fill out the chart at right.

Betelgeuse is larger and reddish orange. Mintaka is smaller and

dark blue. Rigel appears larger and is light blue.

Brightness, mass, size, and temperature.

Betelgeuse

Temperature 3400 k

Luminosity 9500

Radius 1000

Mass 20

2. The Sun has a radius of 695,500 km.

What is the radius of Betelgeuse? 1,000

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