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PHY433- Introductory Astrophysics
RESEARCHED TOPIC PRESENTATION
TOPIC: The Red Giant Stars
What is a Red Giant Star?
A red giant is a luminous giant star that has exhausted the
supply of hydrogen in its core and has begun thermonuclear
fusion of hydrogen in a shell surrounding the core. They have
radii tens to hundreds of times larger than that of the Sun.
Red giants vary in the way by which they generate energy:
• Red-Giant Branch(RGB)
• Red-Clump Stars
• Asymptotic-Giant Branch (AGB)
Many of the well-known bright stars are red giants because
they are luminous and moderately common. The K0 RGB star
Arcturus is 36 light-years away, and Gamma Crucis is the
nearest M-class giant at 88 light-years' distance.
Hertzsprung-Russel(H-R) Diagram
Characteristics
• Low temperature in their outer envelope giving them a yellowish-Orange hue.
• More luminous than the sun because of their great size, despite their lower
energy density.
• . Red-giant-branch stars have luminosities up to nearly three thousand times
that of the Sun (L☉), spectral types of K or M, have surface temperatures of
3,000–4,000 K, and radii up to about 200 times the Sun (R☉). Stars on the
horizontal branch are hotter, with only a small range of luminosities around 75
L☉.
• Asymptotic-giant-branch stars range from similar luminosities as the brighter
stars of the red-giant branch, up to several times more luminous at the end of
the thermal pulsing phase.
Evolution

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Introductory Astro. Red Giant Stars.pptx

  • 1. PHY433- Introductory Astrophysics RESEARCHED TOPIC PRESENTATION TOPIC: The Red Giant Stars
  • 2. What is a Red Giant Star? A red giant is a luminous giant star that has exhausted the supply of hydrogen in its core and has begun thermonuclear fusion of hydrogen in a shell surrounding the core. They have radii tens to hundreds of times larger than that of the Sun. Red giants vary in the way by which they generate energy: • Red-Giant Branch(RGB) • Red-Clump Stars • Asymptotic-Giant Branch (AGB) Many of the well-known bright stars are red giants because they are luminous and moderately common. The K0 RGB star Arcturus is 36 light-years away, and Gamma Crucis is the nearest M-class giant at 88 light-years' distance.
  • 4. Characteristics • Low temperature in their outer envelope giving them a yellowish-Orange hue. • More luminous than the sun because of their great size, despite their lower energy density. • . Red-giant-branch stars have luminosities up to nearly three thousand times that of the Sun (L☉), spectral types of K or M, have surface temperatures of 3,000–4,000 K, and radii up to about 200 times the Sun (R☉). Stars on the horizontal branch are hotter, with only a small range of luminosities around 75 L☉. • Asymptotic-giant-branch stars range from similar luminosities as the brighter stars of the red-giant branch, up to several times more luminous at the end of the thermal pulsing phase.