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The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutionary stage. This diagram shows that there are 3 very different types of stars:
- Most stars, including the sun, are "main sequence stars," fueled by nuclear fusion converting hydrogen into helium. For these stars, the hotter they are, the brighter. These stars are in the most stable part of their existence; this stage generally lasts for about 5 billion years.
- As stars begin to die, they become giants and supergiants (above the main sequence). These stars have depleted their hydrogen supply and are very old. The core contracts as the outer layers expand. These stars will eventually explode (becoming a planetary nebula or supernova, depending on their mass) and then become white dwarfs, neutron stars, or black holes (again depending on their mass).
- Smaller stars (like our Sun) eventually become faint white dwarfs (hot, white, dim stars) that are below the main sequence. These hot, shrinking stars have depleted their nuclear fuels and will eventually become cold, dark, black dwarfs.
Cullen Fay
Wiki User
∙ 11y agoThe two axes of the HR diagram are temperature and luminosity. Most middle-aged, moderate-mass stars tend to cluster along a broad line, called the Main Sequence, which establishes an approximate log relationship between temperature and luminosity over a pretty broad range. At the very beginning and towards the end of their lives they move off the Main Sequence; red giants, for example, tend to occupy what is called the Asymptotic Giant branch. White dwarf stars are of high temperature and low luminosity (because of their small size) and so occupy a separate region off in the corner of the HR diagram.
Wiki User
∙ 13y agoHave a look and make your own mind up.
See related link for more information.
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What type of relationship is shown on a HR diagram?
It is a chart showing a scatter chart of stars according to their temperature and their luminosity (or absolute magnitude).
Which part of the main sequence in the HR diagram contains the stars that took the longest to reach the main sequence?
The HR diagram does not reference stars on their way to the main sequence, only during or after.
The hr diagram graphs what 2 things?
The temperature and luminosity of stars.
What does the HR diagram do?
It shows certain key characteristics (brightness, and temperature) of stars.
Why is the hr diagram useful in plotting the life cycles of stars?
I don't know ok
Where are stars on the hr diagram?
The HR diagram contains only stars - so everywhere.
What kind is stars are shown along the middle of the HR diagram?
The curve that currently contains most stars on the HR diagram is called the "main sequence". It consists of those stars that fuse hydrogen-1, converting it into helium-4.
Why is there no neurton stars in the hr diagram?
Of course they are on the HR diagram. They are simply not on the main sequence.
What type of relationship is shown on a HR diagram?
It is a chart showing a scatter chart of stars according to their temperature and their luminosity (or absolute magnitude).
What types of stars are found on an HR diagram?
All stars.
Where are 90 percent of stars on hr diagram?
main-sequence stars
Why is the hr diagram important to scientist?
The main reason that the HR Diagram is so useful and important to scientists is, you can tell the size of the star by plotting it on the HR Diagram. The different sizes of stars form a pattern on the HR diagram.
Most of the stars on the HR Diagram are classified as which type of star?
stars there called stars
Are most of the stars on the HR diagram are classified as which type of star?
stars there called stars
What are the smallest stars in the HR diagram?
The red dwarves.
Where are most stars plotted on an HR diagram?
Main sequence
What are the stars located on the left side of the hr diagram like?
They are very hot stars.
