Gizmo Warm-up In the early 1900s, astronomers were able to identify many star
characteristics such as color, size, temperature, and
luminosity-or how bright a star is. Using the H-R Diagram
Gizmo™M, you will discover how some of these characteristics
are related
Start by moving your cursor over the stars in the Star
collection. Information about each star 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 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
Temperature
Luminosity
Radius
Mass
2. The Sun has a radius of 695,500 km. X 1,000
What is the radius of Betelgeuse? 617.1 mm