Review (PPT) - Uplift Summit Intl
... the resulting high temperature causes the fusion of nuclei to create elements heavier than carbon. ▪ The giant phase ends with the star having layers of elements with proton numbers that decrease from the core to the outside (much like layers in an onion). ▪ The dense core causes gravitational contr ...
... the resulting high temperature causes the fusion of nuclei to create elements heavier than carbon. ▪ The giant phase ends with the star having layers of elements with proton numbers that decrease from the core to the outside (much like layers in an onion). ▪ The dense core causes gravitational contr ...
The Big Bang Theory - Warren County Schools
... A crucial moment in the creation of the universe was when the atoms that were present became neutral and the radiation was able to flow through it and expand with the universe. This allowed matter to begin clumping to form the structures we observe in the universe. ...
... A crucial moment in the creation of the universe was when the atoms that were present became neutral and the radiation was able to flow through it and expand with the universe. This allowed matter to begin clumping to form the structures we observe in the universe. ...
ppt - SLAC
... powerful stellar wind. Wolf-Rayets are believed to be O stars that have lost their hydrogen envelopes, leaving their helium cores exposed, often in a binary system, and that are doomed, within a few million years, to explode as Type Ib or Ic supernovae. There are two spectral subclasses of Wolf-Raye ...
... powerful stellar wind. Wolf-Rayets are believed to be O stars that have lost their hydrogen envelopes, leaving their helium cores exposed, often in a binary system, and that are doomed, within a few million years, to explode as Type Ib or Ic supernovae. There are two spectral subclasses of Wolf-Raye ...
Stellar populations and dynamics in the Milky Way galaxy
... in this sense meaning that the timescale for collapse is comparable to an orbital or a dynamical timescale, which is of the order of 108 years. It should be noted that Isobe (1974) came to the opposite conclusion from his analysis of the ELS data, and favoured a slow collapse, while Yoshii and Saio ...
... in this sense meaning that the timescale for collapse is comparable to an orbital or a dynamical timescale, which is of the order of 108 years. It should be noted that Isobe (1974) came to the opposite conclusion from his analysis of the ELS data, and favoured a slow collapse, while Yoshii and Saio ...
Astronomy 100—Exam 3
... A. Between the spiral arms of a galaxy. D. in the spiral arms of a galaxy. B. In a planetary nebula. E. In an old globular star cluster. C. In an open star cluster. 24. Astronomers believe a massive black hole exists in the nucleus of the Galaxy. The evidence they provide: A. large amount of X-ray i ...
... A. Between the spiral arms of a galaxy. D. in the spiral arms of a galaxy. B. In a planetary nebula. E. In an old globular star cluster. C. In an open star cluster. 24. Astronomers believe a massive black hole exists in the nucleus of the Galaxy. The evidence they provide: A. large amount of X-ray i ...
March 2011
... that it becomes difficult to identify the original stars of the cluster. This is the situation with our star – The Sun. It almost certainly formed in a cluster from a nebula and passed through all the stages we can see happening now in the clusters around us. After 4.3 billion years the siblings of ...
... that it becomes difficult to identify the original stars of the cluster. This is the situation with our star – The Sun. It almost certainly formed in a cluster from a nebula and passed through all the stages we can see happening now in the clusters around us. After 4.3 billion years the siblings of ...
white dwarfs.
... its parent star had been studied before the explosion. its distance was already known. it was observed early, as its light was still increasing. its evolution was captured with detailed images from the Hubble Space Telescope. e) All of the above are true. Explanation: Supernovae are important distan ...
... its parent star had been studied before the explosion. its distance was already known. it was observed early, as its light was still increasing. its evolution was captured with detailed images from the Hubble Space Telescope. e) All of the above are true. Explanation: Supernovae are important distan ...
Paper
... development are known as the rebirth of a giant star. This article will discuss the life of one very important star, Sakurai’s Object and the converse that surrounds it. There are only three stars that have been observed while in the act of a fast stellar evolution, F.G. Sagittac, V605 Aquilae, and ...
... development are known as the rebirth of a giant star. This article will discuss the life of one very important star, Sakurai’s Object and the converse that surrounds it. There are only three stars that have been observed while in the act of a fast stellar evolution, F.G. Sagittac, V605 Aquilae, and ...
Photometric Mass-to-Light Ratio In addition to a population`s total
... Another useful quantity to know is the rate of mass loss from stars as a function of time. As before, the key to calculating this is to realize that almost all the mass lost from stars comes during the post main-sequence phase of evolution. Thus, the rate at which a population of stars loses mass is ...
... Another useful quantity to know is the rate of mass loss from stars as a function of time. As before, the key to calculating this is to realize that almost all the mass lost from stars comes during the post main-sequence phase of evolution. Thus, the rate at which a population of stars loses mass is ...
Variable Stars
... Quasars: give off radio & X-waves. They are the most distant objects in space. Give off tremendous amounts of energy. Quasars give off enormous amounts of energy - they can be a trillion times brighter than the Sun! Quasars are believed to produce their energy from massive black holes in the center ...
... Quasars: give off radio & X-waves. They are the most distant objects in space. Give off tremendous amounts of energy. Quasars give off enormous amounts of energy - they can be a trillion times brighter than the Sun! Quasars are believed to produce their energy from massive black holes in the center ...
Poster - Arkansas Center for Space and Planetary Sciences
... and blocking some of the light. GX Gem belongs to a category of binary stars called close binaries since the two stars cannot be individually resolved in a telescope. By studying the variation in light in images taken from November 2001 to April 2006, the properties of the stars as well as of the or ...
... and blocking some of the light. GX Gem belongs to a category of binary stars called close binaries since the two stars cannot be individually resolved in a telescope. By studying the variation in light in images taken from November 2001 to April 2006, the properties of the stars as well as of the or ...
The isotopic mixture of barium in the metal-poor
... Nucleosynthesis of heavy elements is dominated by the two neutroncapture processes known as the s- and the r-process. Some nuclides can be synthesized by only the s-process, and others by only the r-process. Both processes contribute almost all the remaining nuclides, with the exception of a few hea ...
... Nucleosynthesis of heavy elements is dominated by the two neutroncapture processes known as the s- and the r-process. Some nuclides can be synthesized by only the s-process, and others by only the r-process. Both processes contribute almost all the remaining nuclides, with the exception of a few hea ...
(massive) binary stars
... predicted by the current theory and detected by Hunter et al. (2008) for single B-type stars. In our analysis, we will benefit from the precisely determined values of the surface gravity (from dynamical mass and radius) and the effective temperature (net result of the Fig. 2 Nitrogen abundance (12 + ...
... predicted by the current theory and detected by Hunter et al. (2008) for single B-type stars. In our analysis, we will benefit from the precisely determined values of the surface gravity (from dynamical mass and radius) and the effective temperature (net result of the Fig. 2 Nitrogen abundance (12 + ...
Cosmology
... The Milky Way Galaxy is a giant disk of stars 160,000 light-years across and 1,000 light-years thick. The Sun is located at the edge of a spiral arm, 30,000 light-years from the center It takes 250 Million years for the Sun to complete one orbit You Are Here ...
... The Milky Way Galaxy is a giant disk of stars 160,000 light-years across and 1,000 light-years thick. The Sun is located at the edge of a spiral arm, 30,000 light-years from the center It takes 250 Million years for the Sun to complete one orbit You Are Here ...
Formation of the Universe
... between 10 and 15 billion years ago. (Most scientists agree that the universe is 13.7 billion years old.) ...
... between 10 and 15 billion years ago. (Most scientists agree that the universe is 13.7 billion years old.) ...
Assessment language for COS page…
... Here are some diagrams that break the history of the universe into times and show how big the universe was at that time. In the beginning 38. How did the name “Big Bang” get coined? ...
... Here are some diagrams that break the history of the universe into times and show how big the universe was at that time. In the beginning 38. How did the name “Big Bang” get coined? ...
Introducing the Stars
... At a distance of 4.2 light years (just over 40 trillion km) from us, even the very nearest star is ~ 11,000 “solar system sizes” away. Interstellar space is predominantly empty (and it is even more so between the galaxies). We live in very atypical surroundings on a rock very close to a star ...
... At a distance of 4.2 light years (just over 40 trillion km) from us, even the very nearest star is ~ 11,000 “solar system sizes” away. Interstellar space is predominantly empty (and it is even more so between the galaxies). We live in very atypical surroundings on a rock very close to a star ...
2017 New Jersey Science Olympiad Union County College
... Given that the mass of White Dwarf 1 is 1 solar mass and the semimajor axis length of White Dwarf 1 is 1 AU, give the semimajor axis length of White Dwarf 2. (C) Given the radii of White Dwarf 1 being 0.5 solar radii and White Dwarf 2 being 0.2 solar radii, give the densities of the two objects in g ...
... Given that the mass of White Dwarf 1 is 1 solar mass and the semimajor axis length of White Dwarf 1 is 1 AU, give the semimajor axis length of White Dwarf 2. (C) Given the radii of White Dwarf 1 being 0.5 solar radii and White Dwarf 2 being 0.2 solar radii, give the densities of the two objects in g ...
- Lorentz Center
... This motivates the “standard story” of unstable C ignition in the core from a single degenerate H donor. . . . • The density must >109 gr/cm3 in the cold (~108 K) core to trigger C burning. This requires M>1.33M and accumulation of mass during accretion. . . • Challenge is the outcome of H and He b ...
... This motivates the “standard story” of unstable C ignition in the core from a single degenerate H donor. . . . • The density must >109 gr/cm3 in the cold (~108 K) core to trigger C burning. This requires M>1.33M and accumulation of mass during accretion. . . • Challenge is the outcome of H and He b ...
Getting to Know: Evidence for the Big Bang Theory
... universe is huge. It’s made of billions of galaxies, ...
... universe is huge. It’s made of billions of galaxies, ...
Expanding the Catalog: Considering the Importance
... for burning in the core. For our highest mass stars that develop convective cores the extent of the convective core changes slightly due to the change in electron fraction (the convective core is high enough in temperature to be dominated by electron scattering opacity) and the energy generation by ...
... for burning in the core. For our highest mass stars that develop convective cores the extent of the convective core changes slightly due to the change in electron fraction (the convective core is high enough in temperature to be dominated by electron scattering opacity) and the energy generation by ...
poll_questions
... Which of the following is mostly likely to be true? The star generates • about as much energy as it radiates • more energy than it radiates into space • less energy than it radiates into space ...
... Which of the following is mostly likely to be true? The star generates • about as much energy as it radiates • more energy than it radiates into space • less energy than it radiates into space ...
Stability of hot neutron stars
... The problem of damping of stellar oscillations in presence of a Urca shell is solved analytically in a plane symmetrical approximation. Low-amplitude oscillations are considered. Oscillatory pressure perturbations induce beta reactions of the electron capture and decay in the thin layer around the U ...
... The problem of damping of stellar oscillations in presence of a Urca shell is solved analytically in a plane symmetrical approximation. Low-amplitude oscillations are considered. Oscillatory pressure perturbations induce beta reactions of the electron capture and decay in the thin layer around the U ...
Nucleosynthesis
Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. It was then that hydrogen and helium formed to become the content of the first stars, and this primeval process is responsible for the present hydrogen/helium ratio of the cosmos.With the formation of stars, heavier nuclei were created from hydrogen and helium by stellar nucleosynthesis, a process that continues today. Some of these elements, particularly those lighter than iron, continue to be delivered to the interstellar medium when low mass stars eject their outer envelope before they collapse to form white dwarfs. The remains of their ejected mass form the planetary nebulae observable throughout our galaxy.Supernova nucleosynthesis within exploding stars by fusing carbon and oxygen is responsible for the abundances of elements between magnesium (atomic number 12) and nickel (atomic number 28). Supernova nucleosynthesis is also thought to be responsible for the creation of rarer elements heavier than iron and nickel, in the last few seconds of a type II supernova event. The synthesis of these heavier elements absorbs energy (endothermic) as they are created, from the energy produced during the supernova explosion. Some of those elements are created from the absorption of multiple neutrons (the R process) in the period of a few seconds during the explosion. The elements formed in supernovas include the heaviest elements known, such as the long-lived elements uranium and thorium.Cosmic ray spallation, caused when cosmic rays impact the interstellar medium and fragment larger atomic species, is a significant source of the lighter nuclei, particularly 3He, 9Be and 10,11B, that are not created by stellar nucleosynthesis.In addition to the fusion processes responsible for the growing abundances of elements in the universe, a few minor natural processes continue to produce very small numbers of new nuclides on Earth. These nuclides contribute little to their abundances, but may account for the presence of specific new nuclei. These nuclides are produced via radiogenesis (decay) of long-lived, heavy, primordial radionuclides such as uranium and thorium. Cosmic ray bombardment of elements on Earth also contribute to the presence of rare, short-lived atomic species called cosmogenic nuclides.