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Star temp

Star temp

Assessment

Presentation

Science

8th Grade

Hard

Created by

Aguado Angelica

Used 1+ times

FREE Resource

10 Slides • 0 Questions

1

Star temperature/life cycle

By Aguado Angelica

2

Stars and the HR Diagram

  • The HR Diagram is a graph that compares the surface temperature of a star with its magnitude or how bright the would be if they were all the same distance from Earth.

  • Luminosity is a term that measures how much energy leaves a star in a certain period of time.

  • General Rule: As luminosity increases, brightness increases.

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What do the axes on this chart show us about stars?

Temperature

Luminosity

Spectral Class

Magnitude

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4

What affects luminosity?

  • Temperature: As temperature increases, luminosity increases.

  • Size: As size increases, luminosity increases.

  • Most Luminous? Large and Hot

  • Least Luminous? Small and Cool

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5

The Life Cycle of a Star

  • All stars begin life as dust in a nebula.

  • Gravity begins to form masses of hydrogen in the nebula.

  • When the heat in the protostar reaches 15,000,000 C, nuclear fusion starts and a star is born!

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This is the Pillars of Creation within the Eagle Nebula, part of M16, viewed by the Hubble Telescope

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2 Pathways:

The mass of the star that forms in the nebula determines how the star will burn fuel:

--small stars burn their fuel more slowly and reach lower temperatures.

--large stars burn through their fuel rapidly and reach higher temperatures.

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Different Endings:

Large stars can end up as black holes or pulsars.

Small stars can end up as a Nova, Supernova or a Black Dwarf.

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Common Ground:

All Stars begin life as a H -> He fusing Main Sequence star.

No matter the mass of a star, as its hydrogen supply begins to run low, the core cools and the star takes on a red color, forming either a Red Supergiant or a Red Giant.

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Star temperature/life cycle

By Aguado Angelica

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