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Lecture 9/10 Stellar evolution Ulf Torkelsson 1 Main sequence stars
Lecture 9/10 Stellar evolution Ulf Torkelsson 1 Main sequence stars

and mass loss
and mass loss

... (v  1/r^2 ) nearly equal. • Bounce shock forms and moves outward and could explode the star. It does not because energy is consumed to disintegrate the infall staff (some 10e51 ergs per 0.1Mo) and to emit neutrinos behind the shock. The shock wave stalls and dies. • A succesful shock requires an ad ...
Soudan Underground Laboratory
Soudan Underground Laboratory

... Neutrinos were long thought to be massless particles, the by products of cosmic ray collisions, as well as nuclear reactions. Their existence was proposed by Wolfgang Pauli (in 1931) to account for the apparent violation of the conservation of energy and momentum that was witnessed during Beta deca ...
Soudan Underground Laboratory
Soudan Underground Laboratory

Griffith Park Observatory
Griffith Park Observatory

... or electricity and magnetism. Suggestions include: Extending the Eye, Beyond the Visible, Tesla Coil, Camera Obscura, Coelostat and Solar Telescope, The Active Sun, Our Sun, West Alcoves, Foucalt Pendulum, Transformation: Stars into Solar Systems, Cloud and Spark Chambers, Our Moon, or Astronomer’s ...
Lifecycle of Stars
Lifecycle of Stars

WIMPs vs. MACHOS: What's the Matter?
WIMPs vs. MACHOS: What's the Matter?

... This significantly exceeds the single event expected from “known” stars in the Galaxy ...
Handout 30
Handout 30

... The band that runs diagonally through the Hertzsprung-Russell diagram and extends from cool, dim, red stars at the lower right to hot, bright, blue stars at the upper left. ...
Star Cycle [Recovered]
Star Cycle [Recovered]

... Stars heavier than about 5 times the mass of the ______ hydrogen can do this with no problem: they burn _____________, helium carbon and then _______________, and then _____________, oxygen _______________, silicon, and so on…until Iron. ...
Playground planets - Earth Learning Idea
Playground planets - Earth Learning Idea

... with minimal resources, for teacher educators and teachers of Earth science through school-level geography or science, with an online discussion around every idea in order to develop a global support network. ‘Earthlearningidea’ has little funding and is produced largely by voluntary effort. Copyrig ...
Requiem for a Star
Requiem for a Star

... – Requires more gravitational collapse = more mass ...
Sections 5 - Columbia Physics
Sections 5 - Columbia Physics

8.4 Scale Diagram of the Solar System
8.4 Scale Diagram of the Solar System

... Name:_______________ ...
11 Solar Masses
11 Solar Masses

lec-life-main-sequen..
lec-life-main-sequen..

... no longer balance in the layers of the star, and the layers begin to expand or contract quickly, then the star has left the main sequence. This is Eta Carinae, where in at least one shell, on at least one occasion, pressure won. In other stars, self-gravity wins. ...
29.3 – Stellar Evolution
29.3 – Stellar Evolution

... Giants & Supergiants • Third stage • Almost all hydrogen has converted to helium – Without hydrogen, core of star contracts • Temperature increases in core – Higher temperature causes helium atoms fuse into carbon atoms – Causes outer shell to expand greatly ...
Formation of the Solar System Reading Questions
Formation of the Solar System Reading Questions

Nucleus hydrogen helium Relative Mass 1.007825 4.0037 Helium
Nucleus hydrogen helium Relative Mass 1.007825 4.0037 Helium

... star may eventually form a black hole. To gain full marks in this question you should write your ideas in good English. Put them into a sensible order and use the correct scientific words. ...
formation of the solar system
formation of the solar system

... Collapsed piece of interstllar cloud formed our Solar Nebula. It collapsed under its own gravity probably triggered by a shock wave. Before collapse, low-density gas had diameter of a few light years. It collapsed to 200 AU, about twice the diameter of Pluto’s orbit. Solar nebula became hottest in i ...
Interview With a White Dwarf – Teacher Guide
Interview With a White Dwarf – Teacher Guide

... Students should cover each of these six main topics in their story. For grading: each of these 6 topic is worth 10%, the overall quality and creativity of the story is worth 20%, and the plots (answers below) are worth 5% each. 1. What are the primary characteristics of a star? A star maintains a ba ...
Document
Document

... • Large frequency spacing scales with average density of the star • Small frequency spacing sensitive to interior gradients, proxy for age ...
wdm_shanghai_Mayinzhe
wdm_shanghai_Mayinzhe

... For m_X > 5keV, star formation efficiency is degenerated with WDM For low mass, the two are not degenerated. This is observable by the high-redshift measurement such as square kilometer array (2020). ...
Lecture 6: The main sequence
Lecture 6: The main sequence

Gravitation and the Waltz of the Planets
Gravitation and the Waltz of the Planets

... Gravitation and the Waltz of the Planets Chapter 4 ...
Lecture 22: The Family of the Sun
Lecture 22: The Family of the Sun

... Range in size from a few 100km to large boulders (few meters) ...
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Standard solar model

The standard solar model (SSM) is a mathematical treatment of the Sun as a spherical ball of gas (in varying states of ionisation, with the hydrogen in the deep interior being a completely ionised plasma). This model, technically the spherically symmetric quasi-static model of a star, has stellar structure described by several differential equations derived from basic physical principles. The model is constrained by boundary conditions, namely the luminosity, radius, age and composition of the Sun, which are well determined. The age of the Sun cannot be measured directly; one way to estimate it is from the age of the oldest meteorites, and models of the evolution of the Solar System. The composition in the photosphere of the modern-day Sun, by mass, is 74.9% hydrogen and 23.8% helium. All heavier elements, called metals in astronomy, account for less than 2 percent of the mass. The SSM is used to test the validity of stellar evolution theory. In fact, the only way to determine the two free parameters of the stellar evolution model, the helium abundance and the mixing length parameter (used to model convection in the Sun), are to adjust the SSM to ""fit"" the observed Sun.
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