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  2. Hertzsprung–Russell diagram - Wikipedia

    en.wikipedia.org/wiki/HertzsprungRussell_diagram

    This type of diagram could be called temperature-luminosity diagram, but this term is hardly ever used; when the distinction is made, this form is called the theoretical HertzsprungRussell diagram instead. A peculiar characteristic of this form of the H–R diagram is that the temperatures are plotted from high temperature to low temperature ...

  3. Main sequence turnoff - Wikipedia

    en.wikipedia.org/wiki/Main_sequence_turnoff

    HR diagrams for two open clusters, M67 and NGC 188, showing the main sequence turn-off at different ages.. The turnoff point for a star refers to the point on the HertzsprungRussell diagram where it leaves the main sequence after its main fuel is exhausted – the main sequence turnoff.

  4. Blue giant - Wikipedia

    en.wikipedia.org/wiki/Blue_giant

    In the standard HertzsprungRussell diagram, these stars lie above and to the right of the main sequence. The term applies to a variety of stars in different phases of development, all evolved stars that have moved from the main sequence but have little else in common, so blue giant simply refers to stars in a particular region of the HR ...

  5. Blue straggler - Wikipedia

    en.wikipedia.org/wiki/Blue_straggler

    Sketch of HertzsprungRussell diagram of a globular cluster, showing blue stragglers. A blue straggler is a type of star that is more luminous and bluer than expected. . Typically identified in a stellar cluster, they have a higher effective temperature than the main sequence turnoff point for the cluster, where ordinary stars begin to evolve towards the red gi

  6. Blue loop - Wikipedia

    en.wikipedia.org/wiki/Blue_loop

    The name derives from the shape of the evolutionary track on a HertzsprungRussell diagram which forms a loop towards the blue (i.e. hotter) side of the diagram, to a place called the blue giant branch. [1] Blue loops can occur for red supergiants, red-giant branch stars, or asymptotic giant branch stars. Some stars may undergo more than one ...

  7. Pre-main-sequence star - Wikipedia

    en.wikipedia.org/wiki/Pre-main-sequence_star

    In the HertzsprungRussell diagram, pre-main-sequence stars with more than 0.5 M ☉ first move vertically downward along Hayashi tracks, then leftward and horizontally along Henyey tracks, until they finally halt at the main sequence.

  8. Stellar isochrone - Wikipedia

    en.wikipedia.org/wiki/Stellar_isochrone

    In stellar evolution, an isochrone is a curve on the Hertzsprung-Russell diagram, representing a population of stars of the same age but with different mass. [1] The Hertzsprung-Russell diagram plots a star's luminosity against its temperature, or equivalently, its color. Stars change their positions on the HR diagram throughout their life.

  9. Main sequence - Wikipedia

    en.wikipedia.org/wiki/Main_sequence

    Color-magnitude plots are known as HertzsprungRussell diagrams after Ejnar Hertzsprung and Henry Norris Russell. After condensation and ignition of a star, it generates thermal energy in its dense core region through nuclear fusion of hydrogen into helium. During this stage of the star's lifetime, it is located on the main sequence at a ...

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