Stars and cosmotoglity Flashcards
Doppler effect?
The effect occurs when there is relative motion between the wave source and an observer
When a source is moving towards something what happens?
wavelength decreases
frequency increases
When a source is moving away something what happens?
wavelength increases
frequency decreases
Classification of stars? (2)
- Colour
- Temp
7 types of stars?
O
B
A
F
G
K
M
Colour and temp for O
dark blue
35000 - 30000
Colour and temp for B
light blue
30000 - 10000
Colour and temp for O
lighter blue
10000-7500
Colour and temp for F
green
7500 - 6000
Colour and temp for G
yellow
6000 - 5200
Colour and temp for K
orange
5200 - 3700
Colour and temp for M
light red
3700 - 2000
How the stars form? (nucleus)
In stars during nuclear fusion the hydrogen nuclei combine to form hydrogen nucleus
How do all stars form?
All stars begin life in the same way. A cloud of dust and gas, also known as anebula, becomes aprotostar, which goes on to become amain sequencestar. Following this, stars develop in different ways depending on their size.
How do stars with a mass higher than the sun form later on?
Stars that are far greater in mass than the Sun follow the right hand path: red super giant star →supernova→ neutron star, or a black hole (depending on size).
How do stars with a mass smaller/same than the sun form later on?
Stars that are about the same mass as the Sun follow the left hand path: red giant star → white dwarf star → black dwarf star.
How do stars create energy?
Intense heat and pressure inside stars cause light elements (like hydrogen) to fuse, forming heavier elements (like helium)
