![Figure caption: Grey scale representation of the probability density distribution of the location of 575 Galactic stars in the spectroscopic Hertzsprung-Russell diagram. Three empirical borderlines between densely populated regions and empty regions are d Figure caption: Grey scale representation of the probability density distribution of the location of 575 Galactic stars in the spectroscopic Hertzsprung-Russell diagram. Three empirical borderlines between densely populated regions and empty regions are d](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados139_151.jpg?itok=5UPbOrqX)
The distribution of stars in the Hertzsprung-Russell diagram narrates their evolutionary history and directly assesses their properties. Placing stars in this diagram however requires the knowledge of their distances and interstellar extinctions, which are often poorly known for Galactic stars. The spectroscopic Hertzsprung-Russell diagram (sHRD) tells similar evolutionary tales, but is independent of distance and extinction measurements. Based on spectroscopically derived effective temperatures and gravities of almost 600 stars, we derive for the first time the observational distribution of
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