'Low mass stars' presentation slideshows

Announcements. Reading for next class: Chapter 20 Cosmos Assignment 2, Due Wednesday, April 14 Angel Quiz. Questions:. Black Holes Star-Gas-Star cycle Halo, halo stars, halo vs. bulge, halo vs disk Spiral arms Do dying stars come back as the same star? superbubbles. Halo Stars:

Death of Low Mass Stars 8 Solar Masses or less. All stars become a red giant. All stars will live to be a Red Giant, then… . In the core of the Red Giant He is fusing into C.

Dimensions of Stars. Having determined that stars are at large distances, high temperatures and very luminous, the next question to ask is how large they are. An Example:. Dimensions of Stars. The star Betelgeuse ( a Orionis) has the following parameters: Distance 150 pc

Stellar Death High Mass Stars. Nucleosynthesis. Evolutionary Time Scales for a 15 M  Star. Fe. C. H. He. Used energy. Released energy. Energy Budget. Energy. Fusion Stages. Animation. The Final Second. Fe fusion begins Energy debt results Core contracts - temperature increases.

The Death of High Mass Stars: 8 Solar Masses and up. All stars will live to see the Red Giant phase, then…. Low mass stars never reach 600 million K in their cores, so fusion of C is impossible. Larger stars can, here is what happens... C  Ne and Mg Core Temp= 600 mil K

Stellar Evolution – Life of a Star. Stellar evolution is the process in which the forces of pressure (gravity) alter the star. Stellar evolution is inevitable; stars deplete their own fuel source.

PART 1 CLUES TO THE FORMATION AND EVOLUTION OF THE MILKY WAY. This scenario is based upon observations of the motions , ages , metalicities of stars as a function of their locations in the galaxy. There are very clear trends in these observables .

The Aging of High Mass Stars is Completely Different. Whereas low mass stars ultimately become white dwarfs, higher mass stars ultimately blow themselves to high heaven . The same stages happen, but no helium flash or horizontal branch… just straight to the super giant phase !

Stellar Evolution: The Live and Death of a Star. Star ch. 20. Standards. Understand the scale and contents of the universe, including stars

WELCOME to the SAASTA AstroQuiz 2017 NATIONAL FINALS 5 OCTOBER 2017. RULES OF THE QUIZ. The audience must be silent throughout the quiz and NOT whisper to anyone. No resource material can be taken into the quiz venue.

Endpoints of stellar evolution. The end of stellar evolution is an inert core of spent fuel that cannot maintain gas pressure to balance gravity .

A New Technique to Measure Δ Y/ Δ Z. Main collaborators: J. R. de Medeiros (UFRN) M. Catelan (PUC). A. A. R. Valcarce (UFRN). XXXVII SAB meeting Águas de Lindóia, Brazil , Oct 16 th , 2012. Outline. Introduction Determination of Y Theoretical models (PGPUC )

Lecture 17. Post-ms evolution II. Review. Review. Review. Second dredge-up: He-shell burning. A Helium-burning shell ignites around a C,O core. Similar to the H-shell burning phase Again, the envelope expands and cools, becoming convective and causing a second dredge-up.

Stellar Evolution: Low Mass Stars. AST 112. Group by mass:. Low-mass stars: Less than 2 M Sun Intermediate-mass stars: 2-8 M Sun High-mass stars: Greater than 8 M Sun. Low-Mass Stars. So… what exactly do low mass stars do? They get on the Main Sequence and convert H to He.

The interstellar medium (ISM ) (Section 18.2, bits of 18.7,18.8). Space between stars is not a vacuum but is filled with gas. Why is the ISM important? Stars form out of it Stars end their lives by returning gas to it Evolution of gas in ISM and stars is crucial

Chapter 12. We can use space exploration to learn about stars, nebulae, and galaxies outside our solar system. Learning about Space. Our current understanding of the solar system has changed with improved technologies Theories are based on evidence that are collected remotely. Early ideas.

Chapter 15: Star Formation and the Interstellar Medium. The “vacuum of space” isn’t a perfect vacuum. There are places out there where there is actually a lot of stuff, though it is still very tenuous. Most of the interstellar medium is hydrogen gas but about 1% is dust.

Components of the Universe. Chapter 11 . 11.1 STARS . Stars are spherical objects in space that radiate energy from their hot cores like a thermonuclear reactor. They outnumber all other celestial bodies. Stars have a life span like all living things on earth.

The Life Cycles of Stars. In a group, create a theory that explains: The origin of stars Where do they come from? The death of stars Why do stars die? What happens to a star when it dies?. What is a Star?. Stars are massive, glowing balls of hot gases, mostly hydrogen and helium.

20.3 The lives of stars. Key concepts: how does a star form? What determines how long a star will exist? What happens to a star when it runs out of fuel? Key terms: nebula, protostar , white dwarf, supernova, neutron star, pulsar, black hole. A star is born.