Download AnwerkeyTypes-of-stars-and-HR-diagram

Types of Stars:
Stars can be classified by:
1. Size
2. Temperature
3. Color
4. Brightness
Classification based on Size and Mass
Type of
Star
Giants
Description
10 to 100 times size of sun
1/10th to 10 times size of sun
Medium
size
White
dwarf
About size of planet
Neutron
Star
About 20Km in diameter
Stars Color and temperature:
Color
Temperature range
Blue
35,000
Examples
Zeta Orions
White
10,000
yellow
6,000
Sirius
Sun
Orange
5,000
Arcturus
Red
3,000
Betelgeuse
What pattern did to you observe between color and temperature of stars?
As temperature increases color changes from red to yellow to white to blue
Hertzprung-Russell Diagram: Graph that illustrates the relationship between the average
surface temperature of stars and their Luminosity (absolute magnitude)
Luminosity is
________________________________________________________________________
Brightness is
________________________________________________________________________
Brightness of star depends on:
1. Brightness
2. Distance
and Luminosity is measured using Brightness and Distance
Answer the following using H-R diagram:
1. Surface Temperature of sun:
__5500 degree celcius______________________
2. How does surface temperature of
White dwarf compares to red giants?
__________________Higher______
3. What is color of stars with highest
Surface Temperature?
____________blue____________
4. What is color of stars with lowest
Surface Temperature?
_______________Red_________
5. List the colors from hottest to
Coldest:
__Blue, white, yellow, orange, red______________________
________________________
6.Most stars on the diagram are
classified as which type of star:
__main sequence_____________________
7. How is it possible for white dwarfs to have a lower luminosity than sun even though
sun is much cooler than the white dwarfs? WHY?
_White drawfs are smaller in size and no nuclear fusion. Luminosity depends on totla
amount of light given off by a star in all
directios_________________________________________________________________
_____