Chapter 21
... The sun is a medium-sized star. Stars that are much larger than the sun are called ______________ or __________________. Composition – The chemical composition of most stars is about 73 % ______________ and 25 % ____________________. How can astronomers infer which elements are found in stars? ___ ...
... The sun is a medium-sized star. Stars that are much larger than the sun are called ______________ or __________________. Composition – The chemical composition of most stars is about 73 % ______________ and 25 % ____________________. How can astronomers infer which elements are found in stars? ___ ...
From the Everett and Seattle Astronomical
... large cosmic gas and dust clouds. Most open clusters have only a short life as stellar swarms. As they drift along their orbits, some of their members escape the cluster due to velocity changes in mutual closer encounters and encounters with field stars and interstellar clouds crossing their path. ...
... large cosmic gas and dust clouds. Most open clusters have only a short life as stellar swarms. As they drift along their orbits, some of their members escape the cluster due to velocity changes in mutual closer encounters and encounters with field stars and interstellar clouds crossing their path. ...
shirley - Yancy L. Shirley`s Webpage
... Both rotation & magnetic fields can only support a cloud in one direction Turbulence characterized as a pressure: Pturb ~ vturb2 General picture is turbulence injected on large scales with a power spectrum of P(k) ~ k-a Potentially fast decay t ~ L / vturb => need to replenish Doppler linewidth is ...
... Both rotation & magnetic fields can only support a cloud in one direction Turbulence characterized as a pressure: Pturb ~ vturb2 General picture is turbulence injected on large scales with a power spectrum of P(k) ~ k-a Potentially fast decay t ~ L / vturb => need to replenish Doppler linewidth is ...
Ay123 Fall 2011 STELLAR STRUCTURE AND EVOLUTION Problem Set 1
... b. Use the equation of hydrostatic equilibrium and zero boundary conditions to find the pressure as a function of radius. Your answer will be in the form p(r) = pc × f (r/R), where f (x) is a function you will determine. What is the dependence of the central pressure pc in terms of M and R ? Express ...
... b. Use the equation of hydrostatic equilibrium and zero boundary conditions to find the pressure as a function of radius. Your answer will be in the form p(r) = pc × f (r/R), where f (x) is a function you will determine. What is the dependence of the central pressure pc in terms of M and R ? Express ...
ASTR-1020 Exam 2 Review Questions
... 13. Describe each of the following close binary stars: detached, semidetached, contact, and overcontact. What do each of these have to do with the Roche lobe and define the Roche lobe. 14. Describe the structure of the ISM. What is meant by interstellar reddening? ...
... 13. Describe each of the following close binary stars: detached, semidetached, contact, and overcontact. What do each of these have to do with the Roche lobe and define the Roche lobe. 14. Describe the structure of the ISM. What is meant by interstellar reddening? ...
Astronomy Seminar Cassy Davison A Search for Companions Around Cool Stars
... initiative, we discovered the closest low mass quadruple system to the Sun. Its lowest mass component might be a brown dwarf. As a complement to our radial velocity program, the RECONS astrometry program searches for more massive planets and brown dwarfs at distances out to 2 AU from the majority of ...
... initiative, we discovered the closest low mass quadruple system to the Sun. Its lowest mass component might be a brown dwarf. As a complement to our radial velocity program, the RECONS astrometry program searches for more massive planets and brown dwarfs at distances out to 2 AU from the majority of ...
Solar System
... Universe: all of space and ________________________________________________ Galaxy: A large group of __________________________________, solar systems, and associated gas and dust in space that is bound by _____________________________ Solar System: Composed of one or more ____________________ ...
... Universe: all of space and ________________________________________________ Galaxy: A large group of __________________________________, solar systems, and associated gas and dust in space that is bound by _____________________________ Solar System: Composed of one or more ____________________ ...
AS2001
... • Recombination: H and He nuclei capture free electrons. Universe now transparent to photons. ...
... • Recombination: H and He nuclei capture free electrons. Universe now transparent to photons. ...
Birth of Stars
... 4: What is the name of the biggest star that has been found called? 5: Why are stars are needed in the universe? ...
... 4: What is the name of the biggest star that has been found called? 5: Why are stars are needed in the universe? ...
PowerPoint - Chandra X
... The use of the grating spectrometer on Chandra enabled astronomers to conclude that the X-rays observed from the torus are scattered and fluorescent X-rays produced by a hidden accretion disk around a supermassive black hole. ...
... The use of the grating spectrometer on Chandra enabled astronomers to conclude that the X-rays observed from the torus are scattered and fluorescent X-rays produced by a hidden accretion disk around a supermassive black hole. ...
The Milky Way
... Additional component of very hot, low-density gas in the ISM: T ~ 1 million K n ~ 0.001 particles/cm3 ...
... Additional component of very hot, low-density gas in the ISM: T ~ 1 million K n ~ 0.001 particles/cm3 ...
Stellar populations and dynamics in the Milky Way galaxy
... gravitational instability, quantified by the Jeans mass. The Jeans mass is that minimum mass at which gravity overwhelms pressure so that density perturbations of mass M MJ ~ 108 T43/2 n1/2ML are unstable and collapse upon themselves, where the numerical factor is for temperature T in units of 10 ...
... gravitational instability, quantified by the Jeans mass. The Jeans mass is that minimum mass at which gravity overwhelms pressure so that density perturbations of mass M MJ ~ 108 T43/2 n1/2ML are unstable and collapse upon themselves, where the numerical factor is for temperature T in units of 10 ...
The Life Cycle of Stars Webquest
... 1. In this webquest, you will learn how to identify stars by their magnitude, color, temperature, and spectral class. 2. You will investigate the process of nuclear fusion explained by Einstein's famous equation E = MC2 and learn how mass in the form of hydrogen atoms is converted to helium and caus ...
... 1. In this webquest, you will learn how to identify stars by their magnitude, color, temperature, and spectral class. 2. You will investigate the process of nuclear fusion explained by Einstein's famous equation E = MC2 and learn how mass in the form of hydrogen atoms is converted to helium and caus ...
Chapter 29 Stellar Evolution
... • All stars create light from Nuclear Fusion – Hydrogen + Hydrogen = Helium ...
... • All stars create light from Nuclear Fusion – Hydrogen + Hydrogen = Helium ...
Exploring the Universe
... an H-R diagram where most stars spend 90% of their life. i. A diagonal band running from the bright, hot stars on the upper left to the dim, cool stars on the lower right ii. Example: The Sun lies in the main sequence iii. The sun is a yellow star (medium sized) that does fusion of hydrogen ...
... an H-R diagram where most stars spend 90% of their life. i. A diagonal band running from the bright, hot stars on the upper left to the dim, cool stars on the lower right ii. Example: The Sun lies in the main sequence iii. The sun is a yellow star (medium sized) that does fusion of hydrogen ...
The Milky Way
... return it to the ISM • Large stars have very strong winds, which can blow big bubbles • Smaller stars have weaker winds ...
... return it to the ISM • Large stars have very strong winds, which can blow big bubbles • Smaller stars have weaker winds ...
the life cycle of stars
... BLACK HOLE • A volume of space in which gravity is SO GREAT that nothing can escape, not even light, although objects can fall in • If the core of a supernova has a mass of more than about two Suns, its own gravity will squash it further, into a black hole. ...
... BLACK HOLE • A volume of space in which gravity is SO GREAT that nothing can escape, not even light, although objects can fall in • If the core of a supernova has a mass of more than about two Suns, its own gravity will squash it further, into a black hole. ...
solar system formation and gal
... The Centre of the Milky Way Galaxy • Using radio waves again, astronomers discovered that the centre of the Milky Way is surrounded by a bulge of stars (a sphere of globular clusters) • The shape of the Milky way galaxy was determined based on its disc-like shape and central bulge of stars, astrono ...
... The Centre of the Milky Way Galaxy • Using radio waves again, astronomers discovered that the centre of the Milky Way is surrounded by a bulge of stars (a sphere of globular clusters) • The shape of the Milky way galaxy was determined based on its disc-like shape and central bulge of stars, astrono ...
PowerPoint - Chandra X
... ESO 137-001: X-ray Tails from Galaxy Plunging into the Core of the Galaxy Cluster A3627 ...
... ESO 137-001: X-ray Tails from Galaxy Plunging into the Core of the Galaxy Cluster A3627 ...
Solar Nebula Theory
... - length of protostar stage (in fact, all stages) A star’s evolution depends on how massive it is: Low Mass (0.08 MSuns < M < 2 MSuns) Intermediate Mass (2 MSuns < M < 8 MSuns) High Mass (M > 8 MSuns) ...
... - length of protostar stage (in fact, all stages) A star’s evolution depends on how massive it is: Low Mass (0.08 MSuns < M < 2 MSuns) Intermediate Mass (2 MSuns < M < 8 MSuns) High Mass (M > 8 MSuns) ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.