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First, when stars of at least 0.4 solar masses exhaust their supply of hydrogen, their outer layers expand to form a red giant.
Evolution towards the red giant branch for the first time is very rapid while stars can spend much longer on the horizontal branch.
Most stars retain more of their hydrogen after the first red giant phase, and eventually become asymptotic giant branch stars.
This is the first ionized nebula to be have been discovered around a red giant star.
Serpentis, a cool red giant that pulsates between magnitudes 5.89 and 7.07 in 87 days.
Although many of those sources are expanding dust envelopes around red giant stars, a few are found to be associated with solar-type stars.
Sun-like stars will enter the red giant branch as subgiants.
Once a star has evolved sufficiently to become a red giant, its circumstellar habitable zone will change dramatically from its main-sequence size.
The star, which is estimated to be at least nine billion years old, has passed the red giant phase.
In another few million years it will likely cease hydrogen fusion, expand, and brighten as it becomes a red giant.
On an inspiration, they scan "inside" the red giant star, and discover a truly ancient rocky world which the star had enveloped in its expansion.
The star is now approaching the end of its life, and has expanded its outer envelope to become a red giant star.
The s-process is a slow neutron capture of lighter elements inside pulsating red giant stars.
This type of low-mass star has consumed the hydrogen at its core, evolved away from the main sequence, and passed through the red giant stage.
It is believed that the surface of the star oscillates slightly, a common feature of red giant stars.
