On An Hr Diagram Stellar Radii

Increase diagonally from the lower left to the upper right. Color index absolute magnitude vs.

Stellar Population Models Claudia Maraston

Radius r the radius of the stars photosphere luminosity l the total electromagnetic power radiated by a star watts.

On an hr diagram stellar radii. Learn vocabulary terms and more with flashcards games and other study tools. Lets now add to the diagram lines of constant radius. The hertzsprung russell h r diagram of stars a plot of stellar luminosity vs.

What other properties of a star can you see on the h r diagram. Measure stellar radii in units of the suns radius where 1 r 696 x 10 8 m. Stellar radii squareroot luminosity 4 pi stefan boltzmann constant temperature4 pi is a constant measured at 314.

On an h r diagram stellar radii. What is the hertzsprung russell diagram. Surface temperature absolute magnitude vs.

The hertzsprung russell diagram a graph of the temperature and luminosity of stars is called the hertzsprung russell diagram h r diagram which is named after two famous astronomers. From the relationship between radius temperature and luminosity in equation a we see that at each point in the h r diagram there is a unique stellar radius given by r l 4 σ t 4 12. The hertzsprung russell diagram readings.

This hertzsprung russell diagram shows a group of stars in various stages of their evolution. The stefan boltzmann constant is measured at 57 x 10 8. Hertzsprung russell diagram the hertzsprung russell diagram hr diagram is one of the most important tools in the study of stellar evolution.

The standard stefan boltzmann law is for point sources an idealized case. You will need to measure. Start studying astr chapter 12.

Axis y stellar luminosity. Main sequence most stars giant supergiant branches white dwarfs. Einar hertzsprung was a danish.

On an h r diagram stellar masses. Effective temperature h r diagram features. For example consider stars with a radius equal to that of the sun r.

A increase diagonally from the lower left to the upper right b are greatest in the lower left and least in the upper right c decrease from left to right d are impossible to determine. The hertzsrung russell diagram hr diagram. The hr diagrams plots stellar brightness versus surface temperature luminosity vs.

On an h r diagram stellar radii. Provides info about stellar radii which must increase as we go from the high temp low luminosity corner lower left to the low temp high luminosity. Write out the stellar radii formula.

Real objects have size which means surface area. Chapter 19 section 19 7 19 8 key ideas luminosity radius temperature relation for stars. The hr diagram becomes a calculating tool when one realizes that temperature luminosity and size radius are all related by stefan boltzmanns law.

Which properties of a star are on the x and y axes. You observe a star and you want to plot it on an h r diagram.

Lecture 7 Stellar Classification 2 2 99