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What is on the x-axis of the Hertzsprung-Russel diagram?
Spectral class (OBAFGKM) or temperature
What is the range of spectral class and temperature on the x-axis of a hertzsprung-russel diagram?
Spectral class: OBAFGKM, OBA close together and FGKM spread further apart
30 000K-3 000K; high temp on the right, low on the left
What is on the y-axis of the Hertzsprung-russel diagram?
Luminosity or absolute magnitude
What is the range of luminosity and absolute magnitude on the y-axis of a hertzsprung-russel diagram?
Luminosity: 100 000 - 0.000 01 (logarithmic scale)
Absolute magnitude: -10 → +15
Draw a hertzsprung-russel (H-R) diagram and label star areas. +explain using stefan’s law
HERE
What is the minimum mass for a cloud to become a protostar? (/Minimum temperature for thermonuclear reactions to take place)
0.1 * solar mass
What are brown dwarves?
What happens in the main sequence phase of a star?
the inward force of gravity and the outward force due to nuclear fusion are in equilibrium. The star is stable.
Hydrogen nuclei are fused into Helium nuclei
The greater the mass of the star, the shorter the main sequence phase of the star.
What happens in the protostar phase of a star?
Nublae clumps together due to gravitational forces
The irregular clumps rotate
and a gravity/conservation of
angular momentum spins
them inwards to form a
denser centre – a
protostar.
