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HR Diagram

A tool that artronomers use to help them understand how stars change over time.

Lexi Marie

on 20 February 2011

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Transcript of HR Diagram

The HR Diagram The HR Diagram is a tool that astronomers use to help them understand how stars change over time. Stands for Hertzsprung-Russell Diagram A star starts out as a Nebula. This is the HR Diagram An HR diagram is a scatter plot of all the different ages and brightnesses of stars This is a Red giant. It represents a late stage in the evolution of stars with a range of masses, from just under the mass of the Sun to tens of solar masses A white dwarf is the next stage in the HR diagram after The Red Giant. It is a small, hot, dim star left over from star death. White Dwarf Red Giant This is the Next Stage in the HR diagram for Medium Stars. The Black Dwarf is a white Dwarf Minus the fusion. Black Dwarf This is the first step after the Main Sequence stars. It is one of the biggest stars, anf will end up as a black dwarf or a neutron star. Super Giant A black Hole is one of the next stages in the Large stars lifetime. A star will eather become a black hole or a neutron star. Im a black hole, nothing can escape the gravitational force. Happens after the star collapses. Black Hole Neutron Star A neutron star is one of the next stages in the HR diagram after the Super Giant. The Neutron star is a heavy dense blue star. Nebula This is the first step in the
HR diagram, and the
Formation of the Star. It is
mix of gas and dust to
make a star. It is very large. Main Sequence Stars These are examples of main sequence
stars. They are the 2nd stage in a stars
life or in the HR diagram. They can be
many different colors. There are many different examples
of HR diagrams. They all may look
Different, But express the same
Information. Medium Planets Large Planets Depending on the
Size of the star, it will
go to a different part
of the HR diagram
in the future when it
gets older. Think of the HR diagram as a representation of stars throughout their lives. Today, a star could be residing on the main sequence (adult), but when the star ages by hundreds of millions of years, it destabilizes. The next "family portrait" may have that exact same star off the main sequence as a red giant (grandparent phase). Some people say that all stars are the same,
but that is incorrect because every star is at
a different stage in its lifetime. This is a graph relating the temperature
and brightness in comparison to the sun. This sun is a mid-life star and will end up bring a white dwarf in the future. There is not one color star that is the hottest, it all depends. Stars in the stable phase of hydrogen burning lie along the Main Sequence according to their mass. After a star enteres the last stage, the star is completely dead. And will not produce any light.
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