Life of stars

1. LIFE OF STARS
By Juan Rodríguez and Jose Vera

2. Index
 Types of stars
 Birth of stars
 Live of stars
 Death of stars
 Bibliography

3. Types of stars
Types of stars
According to size:
According to
Temperature:
Small
(M<0.5 Solar mass)
Medium size
(0.5<M>8)
Giant
(M>8 Solar mass)
Red (hot) White (hotter) Blue (hottest)

4. Birth of stars
 A nebula contracts and forms a protostar.
 The protostar becomes a star.

6. Main sequence
 It‘s the larger period about 90 % of stars
lifetime.

7. Giant star
 In this stage the star starts fusing helium
into oxygen and carbon.
 Its size is normally 100 times its size in
main sequence.

8. Supergiant stars
 In this stage stars creates the rest of the
elements until nickel.
 Only stars with, at least, 8 times the mass
of the Sun reach this phase.

10. Planetary nebula
 At the end of a giant star strong stellar
winds spell its outer layer to the space.

11. White dwarf
 Is the residual nucleus of the star after the
explosion.
 It does not perform nuclear reactions.

12. Supernova
 The nucleus collapse and explodes.
 Here are produced the rest of the
elements.
 They are extremly bright.

13. Black hole
 After the supernova the remaining nucleus of
the start collapse and forms a black hole.
 It occurs when the remaining nucleus has
more than 3 times the mass of the Sun

14. Neutron star
 If the remaining nucleus have got less
than 3 times the mass of the Sun.
 It‘s extremely dense.

15. Bibliography
 https://map.gsfc.nasa.gov/universe/rel_stars.
html
 https://www.nasa.gov/audience/forstudents/9-
12/features/stellar_evol_feat_912.html
 http://solarviews.com/eng/starformation.htm
 http://www.astronomynotes.com/evolutn/chin
dexb.htm
 www.universetoday.com
 oneminuteastronomer.com