Neutron Stars

neutron stars

Main sequence star with mass 8 to 25 times the mass of solar mass becomes supernova type II after losing envelop, leaving a dense degenerate neutron core behind. This core is called neutron star. Neutron…

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Black Holes

Black Hole

Main sequence star having mass greater than 25 times the mass of the sun becomes supernova type II, leaving behind a core that is more massive than the neutron star that is three times the…

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Dynamical time scale

Dynamical time scale

The third and the shortest time scale is the dynamical time scale and it is the time it would take a star to collapse if the pressure supporting it against gravity were suddenly removed. It…

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Thermal Time Scale

supernova

Thermal Time Scale is the time taken by electromagnetic radiation to reach the surface of the star from the center. In other words, the thermal time scale is the time in which a star would radiate…

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Nuclear time scale

Dynamical time scale

The  nuclear time scale is the time in which a star radiates away all  the energy that can be released by nuclear reactions. This time can be estimated by calculating the time taken by all…

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Main sequence star

HR Diagram

Its energy is released by the burning of hydrogen in the core. Stars is in stable equilibrium. Its structure can be changes because of changing chemical composition. In the main sequence evolution takes place on…

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