Spica is a type B main-sequence star whose core has mass 2x10 30 kg. How much ma

Question

Spica is a type B main-sequence star whose core has mass 2x1030 kg. How much mass is changed to energy, when the mass of the core fuses to helium?

-> 1.4x1028 kg

Then How long will Spica live as a main-sequence star? (seconds)

The lifetime of a star Use the amount of energy the star emits per second to find the mass the star changes into energy each second: m-E/c2 Step We have already done this If the luminosity of a star is m 4 x 100 watts, how much 26 4 x 10 mass does it change into energy each second? 3 x 108)2 This example uses the luminosity of the Sun 4 x 109 kg

Explanation / Answer

As mass of star is equal to mass of sun so lifetime of the star is defined as

L=10(10)*(1/1)

So we got

Lifetime=10(10) years

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