Lesson HR Diagrams

03-18-2024 Components of the Universe (Notes Upload)- Closes Monday, on-level only

03-19-2024 Galaxies Quiz and Notes- closes Tuesday

03-20-2024 Daily Grade and Notes- Closes Wednesday

Late/Absent Assignments

1. Test Corrections are currently assigned on Canvas. Due by 04-02-2024.

2. Missed tests must be made up by Thursday of next week.

Announcements

03-21-2024: Hertzsprung-Russell Diagrams

Warmup
You may use yesterday's exit ticket.

Match

Match the following definitions to the correct terms.

• 90 % of stars are in this stage of their life cycle

• The stage after main sequence for a low mass star.

• The stage after main sequence for a high mass star.

• An explosion of a high-mass star.

• When nuclear fusion begins and a star gives off light for the first time.

main sequence

red giant

red supergiant

supernova

protostar

• main sequence

• red giant

• red supergiant

• supernova

• protostar

The Hertzsprung-Russell Diagram
(H-R Diagram)

​You'll upload your notes to the Quizizz at the end.

measures

brightness

luminosity

temperature

color

Open Ended

What does the x-axis represent?

Open Ended

What does the y-axis represent?

Spectra

Luminosity

Spectral Class

Luminosity

Color

temperature

decreases

left

right

Hotter

Cooler

Hottest

Med. Hot

Medium

Med. Cool

Coolest

Label what color
each box of your
HR - Diagram will be.

Blue/Blue-White

White

Yellow

Red-Orange

Red

Color your HR - Diagram

Draw

Draw a vertical arrow (↕) on the hottest part of the diagram.

Luminosity/ Magnitude

Luminosity/ Magnitude

Absolute Magnitude

Apparent Magnitude

Draw

Draw a horizontal arrow (↔) on the brightest part on the diagram.

Main Sequence

Red Super Giant

Blue Super Giant

Red Giant

White Dwarf

Medium

Medium

Yellow

G

Video Response

Show me your completed notes!

Open Video Recorder

Hotspot

Which stars are hotter, white dwarfs, giants, or supergiants?

Hotspot

Which stars are brighter, white dwarfs, giants, or supergiants?

Draw

Circle the group of stars that are very bright, but are cooler.

Multiple Choice

Find our sun on the graph.

Which option best describes our sun, compared to other stars?

• Our sun is one of the brightest, hottest stars

• Our sun is of medium brightness and medium temperature, compared to other stars.

• Our sun is one of the least bright and coolest stars.

• Our sun is very bright, but also quite cool.

Draw

Draw a star on the correct spectral class for Barnard's star.