Stellar Classification

Stellar Classification

By Charles Lawrence

Lesson Target

How are stars classified?​

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​¿Cómo se clasifican las estrellas?

Subject | Subject

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Success Criteria

I can explain how stars are arranged on the HR Diagram.

I can explain how stars are classified.​

​Puedo explicar cómo se organizan las estrellas en el Diagrama HR.

Puedo explicar cómo se clasifican las estrellas.

Subject | Subject

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Review of the HR Diagram

Subject | Subject

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Organizes stars by their temperatures and luminosities

​Organiza las estrellas por sus temperaturas y luminosidades

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​The HR Diagram

Multiple Choice

Hot and bright stars?

¿Estrellas calientes y brillantes?

• A

• B

• C

• D

• E

Multiple Choice

Cool and dim stars?

¿Estrellas frías y tenues?

• A

• B

• C

• D

• E

Multiple Choice

Where is our sun on the HR Diagram?

¿Dónde está nuestro sol en el Diagrama HR?

• A

• B

• C

• D

• E

Multiple Choice

Cool and bright stars?

¿Estrellas frías y tenues?

• A and B

• C and D

• E

Multiple Choice

Main Sequence Stars?

¿Estrellas de la secuencia principal?

• A and B

• C and D

• E

Multiple Choice

Why are the white dwarfs hot but dim?

¿Por qué las enanas blancas son calientes pero tenues?

• They are very large stars

  Ellos son estrellas muy grandes

• They are very small stars

  Ellos son estrellas muy pequeñas

The brightness of a star

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​El brillo de una estrella

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Magnitude

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How bright it appears to us on earth

​Qué brillante se nos aparece en la tierra

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Apparent Magnitude

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Close stars appear brighter than distant stars

Las estrellas cercanas parecen más brillantes que las estrellas distantes​

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Apparent Magnitude

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The actual brightness of a star.​

​El brillo real de una estrella.

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Absolute

Magnitude

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The stars on the HR Diagram are plotted by their absolute magnitude

​Las estrellas en el Diagrama HR se trazan por su magnitud absoluta

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Absolute

Magnitude

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Stellar Classification

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Notice that the stars in the picture have different colors.

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​Observe que las estrellas en la imagen tienen diferentes colores.

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The star color tells us the TEMPERATURE of the star.

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El color de la estrella nos dice la TEMPERATURA de la estrella.

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