Questions tagged [hr-diagram]

Use this tag for questions regarding the Hertzsprung-Russell diagram.

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Why do blue horizontal branch stars turn downwards on the HR diagram as opposed to red horizontal branch stars which remain fairly constant?

Horizontal branch stars (HB) burn helium at their cores. Red horizontal branch (RHB) stars experience an increase in temperature while their radii decrease so their luminosity remains somewhat ...
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Is there a galactic main sequence?

Stars can be plotted on an HR diagram, on which a main sequence is apparent, and stellar evolution can be plotted on on such a diagram as a function of mass. Is there an analog for galactic evolution? ...
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What is the wiggle in the AGB branch?

In many HR diagrams, the asymptotic giant branch includes a wiggle. I thought that these are thermal pulses, but now I realise there are many thermal pulses, and I find only one wiggle. The wiggle ...
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Why can I not get pymultinest running and what's the best way to generate CMD with coding?

I recently downloaded the isochrones environment for Python, and I installed pymultinest for sure, but when I import it in Jupyter Notebook it always says 'ERROR:root:Internal Python error in the ...
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Graphing the evolution of stars on an HR diagram with timesteps

I have found countless images regarding the evolution of stars, plotted on an HR Diagram, like so (found on Wikipedia): Although this displays the time in each stage, it does not include any points ...