Hertzsprung russell diagram

by fashionsta101
Last updated 7 years ago

Discipline:
Science
Subject:
Planets & Astronomy
Grade:
8

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Hertzsprung russell diagram

In the Hertzsprung-Russell (HR) Diagram, each star is represented by a dot. There are lots of stars out there, so there are lots of dots. The position of each dot on the diagram tells us two things about each star: its luminosity (or absolute magnitude) and its temperature.The vertical axis represents the star’s luminosity or absolute magnitude. Luminosity is technically the amount of energy a star radiates in one second, but 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 different. Luminosity is a common term, as is absolute 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 core of a star, only its surface)! Usually this is labeled using the Kelvin temperature scale. But notice : In most graphs and diagrams, zero (or the smaller numbers) exist to the left on the diagram. This is not the case here. 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 as they can be seen through filters on spectrophotometers. This is also a "ratio scale."

The Hertzsprung-Russell Diagram

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