H-r diagram main sequence

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    Hertzsprung-russell!

    The Hertzsprung-Russell diagram

    Copyright © Michael Richmond. This work is licensed under a Creative Commons License.

    We now have ways to measure several properties of stars:

    • apparent magnitude
    • temperature
    • distance
    • absolute magnitude (and luminosity)
    • radius
    • mass

    But what good does it do?

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    • We can make up tables containing hundreds or thousands of stars, with columns for mass, radius, temperature, etc. -- okay. It would help, though, if we could discover just a few simple relationships between these variables; humans are very good at remembering and pondering a few, simple rules, but very bad at remembering thousands and thousands of numbers.

    Are there any simple relationships hidden in this wealth of data? The answer, of course (why else would I ask the question?) is YES. Let's set the Wayback Machine for the early 1900s, when astronomers first put together the raw numbers for hundreds of stars ....

    Hertzsprung and Russell

    One of the astronomers who gathered together in one place measurements of many stars was the Danish scientist Ejnar Her

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