Hertzsprung Russle

Question 1

Arrangement

Answer 1

By colour or spectral class red on right and blue on left
By luminosity where the sun is equal to one
Surface temperatures with reversed numerical order

Question 2

When was it plotted

Answer 2

1919

Question 3

Main sequence stars

Answer 3

Distance band from the top left to the bottom right
Thought to be in their most stable part of their life cycle
Will gradually cool and die out or expand before exploding
Spends 90% if their lives burning hydrogen and helium
Luminosity class of v
Examples
Sun spica
Vega
Proxima Centauri
Sirius A

Question 4

Red giants and super giants

Answer 4

Region above main sequence stars
Bear the end of their lives
Low surface temperature
High luminosity class 1 and class 3
According to the Stefan Boltzmann law they have large radi
In this stage they have exhausted all hyrdrofe. And have started to burn helium and other elements they will eventually explode

Question 5

Red giant examples

Answer 5

Procryon a
Arcturus
Aldebaran

Question 6

Supergiants

Answer 6

Polaris 
Betelgeuse 
Rigal 
Antares 
Deneb

Question 7

White dwarfs

Answer 7

Bottom left
Sum because they are small have a luminosity class of D
Final evolutionary stage of low and medium mass stars
Are cooling and will eventually become black
Examples Sirius b and procryon B

Question 8

Uses

Answer 8

Summarize the evolution of stars
Investigate properties of a group of stars
Plot star clusters to estimate the age of a cluster and see where stars vear off the main sequence