Physics - Hertzsprung-Russell Diagrams
OCR A-Level Physics 2022
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Flashcards
Identifying the diagram and its axes
What is this?Which out of luminosity and temperature goes in the wrong direction on a Hertzsprung-Russell diagram?
Temperature.
What is sometimes confusing about the temperature values on a Hertzsprung-Russell diagram?
They measure “effective temperature”, not the temperature of the core.
What are the units for luminosity measured on a Hertzsprung-Russell diagram?
Solar luminosity, $L _ \odot$
Are the scales on a Hertzsprung-Russell diagram logarithmic or linear?
Logarithmic.
The sun’s path and regions of the diagram
Approximately what path will the sun trace out as it lives out its life?
What section is this?
What section is this?
What section is this?
What section is this?What sort of stars does the long diagonal strip on a Hertzsprung-Russell diagram consist of?
Main sequence stars.
Why couldn’t you place a black hole on a Hertzsprung-Russell diagram?
Because it doesn’t really have a defined temperature.