A star is observed to be thrice the size of the Sun with temperature of 1.3Tsun. Estimate its luminosity.
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Q: 1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.
A: Please see the next step for solution:-
- The energy radiated by a star is defined as its luminosity. Luminosity depends on the temperature and hotter stars will be more luminous than cooler stars.
- The luminosity of a star can be defined in terms of the luminosity of the Sun. It is given by,
Here L is the luminosity of the star, LSun is the luminosity of the Sun, R is the radius of the star, RSun is the radius of the Sun, T is the temperature of the star, and TSun is the temperature of the Sun.
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