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The hottest giants, of spectral classes O, B, and sometimes early A, are called The blue giants are a very heterogeneous grouping, ranging from high-mass, high-luminosity stars just leaving the main sequence to low-mass, Lower-mass, core-helium-burning stars evolve from red giants along the horizontal branch and then back again to the The End of the Main Sequence, Gregory Laughlin, Peter Bodenheimer, and Fred C. Adams,

…at about 3,500–5,000 K, and M stars are red, at about 3,000 K, with titanium oxide prominent in their spectra. Part I: Luminosity, Temperature and Size This exercise is about the law of Stefan and Boltzmann. They are far less numerous than red giants, partly because they only form from stars with somewhat higher masses, and partly because they spend less time in that phase of their lives.

This brings additional hydrogen into a zone where the temperature and pressure are sufficient to cause fusion to resume in a shell around the core. They are the largest stars in the universe in terms of physical size, although they are not the most massive.

[3pt] A red giant star has a temperature of 4400 K and a luminosity of 11700 L⊙. Its temp is 5000k or below. Classification is complex and difficult with small differences between luminosity classes and a continuous range of intermediate forms. This brings additional hydrogen into a zone where the temperature and pressure are sufficient to cause fusion to resume in a shell around the core.

At the same time hydrogen may begin fusion in a shell just outside the burning helium shell. By comparison, the universe is only 13.8 billion years old.

Horizontal-branch stars, with more heavy elements and lower mass, are more unstable.

How many times bigger is this star than the Sun?

Although some subgiants are simply over-luminous main-sequence stars due to chemical variation or age, others are a distinct evolutionary track towards true giants.

The giant phase for such stars is a brief phase of slightly increased size and luminosity before developing a supergiant spectral luminosity class. Subgiants are an entirely separate spectroscopic luminosity class (IV) from giants, but share many features with them. This could be because giant stars are more massive than the Sun (less massive stars will still be on the Many of the well-known bright stars are red giants, because they are luminous and moderately common.

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[3pt] Match each of the characteristics listed below the appropriate object.

Search Britannica However, these giant planets are more massive than the giant planets found around solar-type stars. Betelgeuse and Antares are the brightest and best known red supergiants (RSGs), indeed the only first magnitude red supergiant stars

The hydrogen-burning shell results in a situation that has been described as the The evolutionary path the star takes as it moves along the red-giant branch depends on the mass of the star.

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