Red giants are stars with radii tens to hundreds of times larger than that of the Sun which have exhausted the supply of hydrogen in their cores and switched to fusing hydrogen in a shell outside the core. The main sequence stars of spectral types A through K are believed to become red giants.[2]
In fact, red giants are not big red spheres with sharp stellar limbs, as seen in many depictions. Due to the very low density such stars may not have a sharp photosphere but a star body which gradually transfers into a 'corona'.
In fact, red giants are not big red spheres with sharp stellar limbs, as seen in many depictions. Due to the very low density such stars may not have a sharp photosphere but a star body which gradually transfers into a 'corona'.
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