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Announcements

Announcements

Announcements. Quiz 4 - March 4 Stellar evolution Low-mass stars Binaries High-mass stars Supernovae Synthesis of the elements WWW lab is available at the class WWW site. Last Time.

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Lecture 1 Time Scales, Temperature-density Scalings, Critical Masses

Lecture 1 Time Scales, Temperature-density Scalings, Critical Masses

Lecture 1 Time Scales, Temperature-density Scalings, Critical Masses. I. Preliminaries. The life of any star is a continual struggle between gravity, seeking to reduce the star to a point, and pressure, which supports the star. Stars are gravitationally confined thermonuclear reactions.

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Life Cycles of Stars

Life Cycles of Stars

Life Cycles of Stars. The Hertzsprung-Russell Diagram. How Stars Form. Collapsing gas and dust cloud Protostar - mostly infrared. Main Sequence Stars. Brown Dwarf (L, T, Y) Red Dwarf (M) Normal Star (O, B, A, F, G, K).

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THE LIFE CYCLE OF A STAR

THE LIFE CYCLE OF A STAR

THE LIFE CYCLE OF A STAR. What is a Star?. Stars are glowing gas that start in Nebulae . They vary in size, mass and temperature, diameters ranging from 450x smaller to over 1000x larger than that of the Sun.

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Stellar Evolution

Stellar Evolution

Stellar Evolution. The birth, Life and Death of stars Assigned Reading: up to Chapter 12. A main sequence star is the one which is supported by hydrogen fusion. The main sequence exists because stars balance their weight with energy outflows, produced by nuclear fusion in their core.

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Chapter 18

Chapter 18

Chapter 18. Evolution from the Main Sequence. Astro1010-lee.com. UVU Survey of Astronomy. twlee2016@gmail.com. Chapter 18. Astro1010-lee.com. UVU Survey of Astronomy. twlee2016@gmail.com. Chapter 18. Evolution from the Main Sequence.

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Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature

Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature

Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature. Our Sun: 5,700 deg Kelvin Or about 10,000 F. O B A F G K M L T. Not to scale: Red Giant 100 times bigger than Main Sequence Star. Pre main sequence evolution: Protostellar, self-gravitating

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Life Cycle of a Star

Life Cycle of a Star

Life Cycle of a Star. Birth of a Star. Starts in a nebula A nebula is a giant cloud of gas and dust. Birth of a Star. Gravity in the nebula gradually pulls the hydrogen together which causes it to spin. This spinning and the atoms bumping into each other creates heat.

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Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature

Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature

Hertzsprung Russell (HR) Diagram Spectral Types: Proxy for T eff Or surface temperature. Our Sun: 5,700 deg Kelvin Or about 10,000 F. O B A F G K M L T. Not to scale: Red Giant 100 times bigger than Main Sequence Star. Pre main sequence evolution: Protostellar, self-gravitating

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395 views • 21 slides
The Sun as a Star

The Sun as a Star

The Sun as a Star. Susan Cartwright University of Sheffield. What do we know about the Sun?. Its size and its distance from us Its luminosity (energy generated per second) Its (surface) chemical composition and temperature How it generates energy Its (approximate) age

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Megan Garmes Betsy Nichols

Megan Garmes Betsy Nichols

Megan Garmes Betsy Nichols. Stages of Stars. What is a star?. Stars are hot bodies of glowing gas that start their life in Nebulae . Career of a star depends mostly on its mass. The more massive the star, the more pressure is built up inside.

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Stellar Evolution

Stellar Evolution

Stellar Evolution. By: Brian Smith 2ndp. Interstellar Cloud. At this stage cloud of dust and gas start to clump together . As these clumps gather more mass their gravitational attraction increases , pulling more atoms into the clump. Cloud Fragment.

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RIGEL

RIGEL

By: Leonard Pettus. RIGEL. Description. Arabic for "foot" One of the galaxy's brightest stars. Brilliant bluish-white Supergiant 775 light years away 70 times the sun's diameter 40,000 times the sun's luminosity Brightest star in Orion (Star Map)

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A star will experience a helium flash if a. it is less massive than about 3 solar masses

A star will experience a helium flash if a. it is less massive than about 3 solar masses

A star will experience a helium flash if a. it is less massive than about 3 solar masses b. its has become a red giant star c. its has formed a helium core d. the material in the core has gradually become degenerate e. All of the above must be true. In degenerate matter

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PI Total time #CoIs, team

PI Total time #CoIs, team

Hot Stars in Helium-Enriched Globular Clusters

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178 views • 6 slides

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