# What is a graph relating the temperature and brightness of stars?

## What is a graph relating the temperature and brightness of stars?

The Hertzsprung-Russell diagram (or H-R diagram) is a graph that shows the relationship between a star’s surface temperature and brightness. (Brightness is displayed as absolute magnitude or luminosity.) The H-R diagram is also a tool for studying the nature of stars and how they change over time.

### What indicates the temperature and brightness of stars?

The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red. A color index of a star is the difference in the magnitudes measured at any two wavelengths and is one way that astronomers measure and express the temperature of stars.

Where on the graph are the hottest and brightest stars located?

Hot stars inhabit the left hand side of the diagram, cool stars the right hand side. Bright stars at the top, faint stars at the bottom.

What does the graph show about the relationship of a star’s color and temperature explain?

What does the graph show about the relationship of a star’s color and temperature? There is no relationship of a star’s color and temperature. Red/Orange stars are the coolest and blue stars are the hottest; As stars grow hotter, their temperature changes from Red/Orange to Blue. It has a very deep Blue color.

## Where do we find 90% of the stars on the diagram?

main sequence
The main sequence stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram. It is here that stars spend about 90% of their lives burning hydrogen into helium in their cores.

### What reveals a star’s surface temperature?

A star’s surface temperature is revealed by color.

What indicates a star’s temperature?

color
The color of a star mostly indicates a star’s temperature, and it can also suggest the star’s age. Class O stars, which are blue in color, are the hottest, and class M stars, which are red in color, are the coldest.

What determines the brightness of a star?

However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.

## Which star is brighter Antares or Betelgeuse?

Both stars are typical massive M2 supergiant stars, 500-600 light years away. Betelgeuse is slightly brighter (V = 0.45), perhaps because it is slightly more luminous. This means that, if Antares was where the sun is, we would be well inside it! Red Antares A has a hot blue companion Antares B, a B2.

### Where is Sirius on the H-R diagram?

At the lower left corner of the H-R diagram are the smallest stars. Stars like Sirius B and Procyon B are just the opposite of the supergiants. They are extremely hot, dense, and dim. These are white dwarf stars that are about the size of the earth, and about as massive as the sun.

How do the stars luminosity compare with their radii?

are stars very bright or not very bright? how do the stars’ radii compare with their mass? as the radius increases, the luminosity would be brighter(direct relationship) as the radius of a star increases, how do you think its luminosity might change?

What relationship do you see between star color and star temperature on a HR diagram?

Blue or white are the hottest and red is the coolest. Our own star, the Sun, is nearly in the middle of both the temperature and luminosity scales relative to other stars.

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