Neutron Stars
Main sequence star with mass 8 to 25 times the mass of solar mass becomes supernova type II after...
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Category: Stars
Black Holes
Main sequence star having mass greater than 25 times the mass of the sun becomes supernova type...
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Post main sequence evolution of star with mass more than 8 times the mass of Sun
Massive stars can manufacture heavier elements because of its extremely high core density and...
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Asymptotic Giant Branch and White Dwarf
Asymptotic Giant Branch Both hydrogen and helium burning run in the spherical shell. In this...
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Giant Branch, Helium Flash, Horizantal Branch and Pulsating Stars
Giant Branch When stars leave the main sequence, they begin burning hydrogen in an expanding thin...
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Post main sequence Evolution of Stars
Stars leaves the main sequence when it exhausts the hydrogen in the core. These are two ways for...
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Dynamical time scale
The third and the shortest time scale is the dynamical time scale and it is the time it would take...
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Thermal Time Scale
Thermal Time Scale is the time taken by electromagnetic radiation to reach the surface of the star...
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Nuclear time scale
The nuclear time scale is the time in which a star radiates away all the energy that can be...
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Main sequence star
Its energy is released by the burning of hydrogen in the core. Stars is in stable equilibrium. Its...
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wolf rayet stars
Wolf Rayet Stars (discovered by C. Wolf and G. Royet in 1867) are very hot stars (T > 70,000...
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The Yerkes spectral classification
The Harvard classification only takes into account the effect of the temperature on the spectrum....
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HR Diagram
E. Hertzsprung and H. Norris Russell studied the relation between the absolute magnitude (or...
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Harvard Spectral Classification
The Harvard Spectral Classification is based on the absorption lines (i.e. bark lines) in the...
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