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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

    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. By plotting the turnoff points of individual stars in a star cluster one can estimate the cluster's age.

  4. Hayashi track - Wikipedia

    en.wikipedia.org/wiki/Hayashi_track

    On the HertzsprungRussell diagram, which plots luminosity against temperature, the track is a nearly vertical curve. After a protostar ends its phase of rapid contraction and becomes a T Tauri star, it is extremely luminous. The star continues to contract, but much more slowly.

  5. 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.

  6. Horizontal branch - Wikipedia

    en.wikipedia.org/wiki/Horizontal_branch

    HertzsprungRussell diagram for globular cluster M5, with the horizontal branch marked in yellow, RR Lyrae stars in green, and some of the more luminous red-giant branch stars in red. The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's.

  7. Stellar age estimation - Wikipedia

    en.wikipedia.org/wiki/Stellar_age_estimation

    1 Luminosity increase and the HertzsprungRussell diagram. 2 Field stars. 3 Membership in a star cluster or system. 4 Presence of a protoplanetary disk. 5 ...

  8. Henyey track - Wikipedia

    en.wikipedia.org/wiki/Henyey_track

    The Henyey track is a path taken by pre-main-sequence stars with masses greater than 0.5 solar masses in the HertzsprungRussell diagram after the end of the Hayashi track. The astronomer Louis G. Henyey and his colleagues in the 1950s showed that the pre-main-sequence star can remain in radiative equilibrium throughout some period of its ...

  9. Stellar birthline - Wikipedia

    en.wikipedia.org/wiki/Stellar_birthline

    The stellar birthline is a predicted line on the HertzsprungRussell diagram that relates the effective temperature and luminosity of pre-main-sequence stars at the start of their contraction. [1] Prior to this point, the objects are accreting protostars , and are so deeply embedded in the cloud of dust and gas from which they are forming ...

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