RR Lyrae and other variable stars occupy the “instability strip” of this diagram. For 10 points each:
[10e] Identify this diagram that plots stars based on their properties and is named after two astronomers. Main sequence stars occupy the top left to bottom right of this diagram.
ANSWER: Hertzsprung–Russell diagram [or HR diagram]
[10m] Either absolute magnitude or this quantity is plotted against temperature on the Hertzsprung–Russell diagram.
ANSWER: luminosity [prompt on L]
[10h] This path on the Hertzsprung–Russell diagram describes [emphasize] low-mass infant stars that decrease in luminosity over time but do not change temperature.
ANSWER: Hayashi track
<Other Science>