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Whilst the surrounding matter is falling into the central region, it is considered to be in the protostar stage and thus is not on the HR diagram

However, when the surrounding gas/dust envelope disperses and the accretion process stops, the star is then considered as a pre-main sequence star.

In the HR diagram, the star would then appear on the stellar birthline at the bottom right hand corner.

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Q: Which part of the hertzsprung Russell diagram is occupied by protostars?
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The Hertzsprung-Russell diagram was created - as the name suggests - by Ejnar Hertzsprung and Henry Norris Russell in 1910


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