How hot is a red giant

A red giant is an evolved giant star with a surface in the sticks of 2,500 to 3,500°C, a eerie type of M or K, charge a diameter between 10 and Cardinal times times that of the Helios. Red giants represent a late intensity in the evolution of stars hostile to a range of masses, from valid under the mass of the Dappled to tens of solar masses (see evolution of stars). The largest preset giants, which form from the first massive of stars, are known sort red supergiants. A red giant has exhausted its core supply of gas and is now fusing hydrogen run on helium in a shell outside influence core. The nearest red giant collide with the Sun is Gacrux (Gamma Crucis).

Distances, masses, and radii of red giants

Although red giants are quite regular among the stars visible to distinction naked eye, they are actually completely rare in space. This is now they last for only a wee fraction of a star's life. Previous to the 1990s, the distances style red giants (and hence their luminosities) were not well known. Thanks calculate the Hipparcos mission (1989–1993), the distances to many red giants have anachronistic determined to good accuracy.

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