hr diagram, what happens to the temperature as you move to the right of the diagram?
Are all stars the aforementioned? Not in the least! Some stars are just beginning to form in nebulae, others are enjoying eye age along the main sequence, and some accept begun to die. The life bike of a star can exist compared to the life cycle of humans. Notice out what stage yous would exist in if you were a star. The Hertzsprung-Russell Diagram is a tool that shows relationships and differences between stars. It is something of a "family portrait." It shows stars of dissimilar ages and in different stages, all at the aforementioned time. But it is a great tool to check your agreement of the star life bike. Let�s get over the basics before nosotros check your understanding.
In the Hertzsprung-Russell (HR) Diagram, each star is represented past a dot. There are lots of stars out there, so at that place are lots of dots. The position of each dot on the diagram tells usa two things well-nigh each star: its luminosity (or absolute magnitude) and its temperature.
The vertical axis represents the star�southward luminosity or accented magnitude. Luminosity is technically the corporeality of energy a star radiates in one second, just you can think of it as how bright or how dim the star appears. Depending upon the textbook you use, the labels on the HR diagram could be a little dissimilar. Luminosity is a common term, equally isabsolute magnitude . Absolute magnitude is the intrinsic brightness of a star. In either case, the scale is a "ratio scale" in which stars are compared to each other based upon a reference (our sun).
The horizontal axis represents the star�s surface temperature (not the star�s core temperature � we cannot see into the cadre of a star, just its surface)! Ordinarily this is labeled using the Kelvin temperature scale. Simply find : In most graphs and diagrams, zero (or the smaller numbers) be to the left on the diagram. This is not the case hither. On this diagram, the higher (hotter) temperatures are on the left, and the lower (cooler) temperatures are on the right. Some HR diagrams include the color of stars every bit they can be seen through filters on spectrophotometers. This is too a "ratio scale."
So how practice you read the HR diagram? Well, let�south look at some bones regions on information technology. A star in the upper left corner of the diagram would be hot and bright. A star in the upper right corner of the diagram would be cool and brilliant. The Sun rests approximately in the center of the diagram, and it is the star which we use for comparison. A star in the lower left corner of the diagram would be hot and dim. A star in the lower correct corner of the diagram would be cold and dim.
Interactive Lab
Let�due south run across how practiced you are at reading the HR diagram. Click the diagram below, we have v stars. How would yous describe the temperature of Star A? (Comparing the stars to each other) And how would you lot depict the luminosity (brightness) or Star A? Look at Stars B through E and depict each of them.
Are there any stars that seem out of identify? For case, are there any stars that are really hot but non very bright? Are there any stars that are not very hot merely they shine very brightly? What do you think could business relationship for these differences in stars that do non fit the blueprint? Stars that exercise fit the pattern are chosen main sequence stars. Permit�due south look at those before we deal with the exceptions.
Near of the stars lie within a region called the main sequence. It looks kind of like a curved line sloping from the upper-left to the lower-correct of the HR diagram. At that place are some stars that are non on the main sequence, but for now permit�s concentrate on the main sequence stars. Why is there a main sequence region anyway?
Well, at that place is a predictable relationship between the brightness and size of a star. This shows up on the HR diagram. Nosotros know that hotter things are brighter. A hotter temperature means that more than energy is radiated into space. Bigger stars are brighter. A bigger surface surface area means that more energy is radiated into space. The sunday is used as a reference, and so let�s employ some logic to figure out how this works.
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Source: http://aspire.cosmic-ray.org/Labs/OldStarLife/hr_diagram.html
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