H-R Diagram Quiz

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Questions and Answers

What type of data is graphed along the X-Axis in an H-R Diagram?

Spectral class

Temperature (correct)

Luminosity

Brightness

What is the relationship between temperature and brightness for main sequence stars?

Brightness increases, but temperature remains constant

As temperature increases, brightness decreases

As temperature increases, brightness increases (correct)

There is no relationship between temperature and brightness

What type of star is the hottest?

Red Supergiant

M-type star

White Dwarf

Blue Giant (correct)

Which type of star is the brightest?

O-type star Signup and view all the answers

What does Absolute Magnitude measure for a star?

Actual brightness of the star Signup and view all the answers

Why do white dwarf stars have a low brightness when they are so hot?

Their high temperature is offset by their small size Signup and view all the answers

What does the H-R Diagram graph on the Y-Axis?

Luminosity Signup and view all the answers

What type of star is our sun classified as?

"G" type star Signup and view all the answers

'O' stars are characterized as being:

The brightest and most massive Signup and view all the answers

At what point do stars begin in an H-R Diagram?

"Protostar" region Signup and view all the answers

What effect does increasing temperature have on the brightness of main sequence stars?

Brightness increases Signup and view all the answers

Which type of star is the hottest?

Blue giant Signup and view all the answers

What type of star is the brightest?

Red supergiant Signup and view all the answers

Why do white dwarf stars have a low brightness despite being hot?

They have small surface area Signup and view all the answers

What does Absolute Magnitude measure for a star?

Actual brightness Signup and view all the answers

What type of star is our sun classified as?

Main sequence Signup and view all the answers

What is the relationship between temperature and luminosity for main sequence stars in the H-R Diagram?

Luminosity increases as temperature increases Signup and view all the answers

At what point in the H-R Diagram do stars begin their life cycle?

Lower right-hand corner Signup and view all the answers

'O' stars are characterized as being:

The hottest and most massive Signup and view all the answers

What type of data is graphed along the Y-Axis in an H-R Diagram?

Luminosity (brightness) Signup and view all the answers

Study Notes

H-R Diagram

Temperature (in Kelvin) is graphed along the X-Axis in an H-R Diagram, typically ranging from 1,000 to 50,000 K.
The relationship between temperature and brightness for main sequence stars is direct, with increased temperature resulting in higher brightness.
'O' stars are the hottest type of star.
'O' stars are also the brightest type of star.

Star Characteristics

Absolute Magnitude measures the intrinsic brightness of a star, which is its brightness at a standard distance of 10 parsecs.
White dwarf stars have a low brightness despite being hot due to their small size, which results in a lower surface area and consequently lower luminosity.

H-R Diagram Structure

The Y-Axis of an H-R Diagram represents the luminosity or brightness of stars, typically measured in units of solar luminosity (L).
Our sun is classified as a G-type main-sequence star (G2V).
Stars begin their life cycle at the main sequence stage in the H-R Diagram, where they fuse hydrogen into helium in their cores.

Additional Information

'O' stars are characterized as being extremely hot and luminous.
Increasing temperature has a direct effect on the brightness of main sequence stars, resulting in higher luminosity.

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Description

Test your knowledge of the Hertzsprung-Russell diagram, a graph that displays the relationship between stars' temperature and luminosity. The quiz covers the creators of the diagram, its axes, and the correlation between temperature and spectral class.