proposed research projects for pparc gemini studentships
... formation of S0 galaxies, and their dependency on galaxy mass. To this end, we propose a spectral study of a large sample of lenticular systems to establish the links between the properties of their stellar populations (ages and chemical abundances) and their kinematic properties (masses and dynamic ...
... formation of S0 galaxies, and their dependency on galaxy mass. To this end, we propose a spectral study of a large sample of lenticular systems to establish the links between the properties of their stellar populations (ages and chemical abundances) and their kinematic properties (masses and dynamic ...
Chapter 14
... structure to enter a stage of hydrostatic equilibrium again as it undergoes helium fusion. The star then descends in the H-R Diagram to become a horizontal branch star. 7. Horizontal Branch Stage Which is also the stage of He fusion in the core with hydrostatic equilibrium again, similar to the mai ...
... structure to enter a stage of hydrostatic equilibrium again as it undergoes helium fusion. The star then descends in the H-R Diagram to become a horizontal branch star. 7. Horizontal Branch Stage Which is also the stage of He fusion in the core with hydrostatic equilibrium again, similar to the mai ...
5. Star Formation and the Interstellar Medium in the Milky Way
... uncertain, as a result of the variety of different processes which may be important, including reactions in the gas phase, processes on grains, and the effects of radiation fields and cosmic rays. Absolute abundances are difficult to determine as a function of physical conditions; such conditions vary ...
... uncertain, as a result of the variety of different processes which may be important, including reactions in the gas phase, processes on grains, and the effects of radiation fields and cosmic rays. Absolute abundances are difficult to determine as a function of physical conditions; such conditions vary ...
journey to the stars - American Museum of Natural History
... Look! Another one’s forming…and there it goes. The first stars changed everything, combining hydrogen and helium into new elements, such as oxygen and ...
... Look! Another one’s forming…and there it goes. The first stars changed everything, combining hydrogen and helium into new elements, such as oxygen and ...
1Lec_1 - The University of Texas at Dallas
... we go through the material that I will now start talking about. (“What the heck? I thought this supposed to be a Biology course.”) Fear Not: The detailed information that follows in slides #14 - #26 will “not be on the test.” We are going to go through it because I believe that a Biology major shoul ...
... we go through the material that I will now start talking about. (“What the heck? I thought this supposed to be a Biology course.”) Fear Not: The detailed information that follows in slides #14 - #26 will “not be on the test.” We are going to go through it because I believe that a Biology major shoul ...
Mass and Age determination for low
... – Classical T Tauri Stars (CTTS): circumstellar disk/active mass accretion and mass loss processes/interaction star-disk; ...
... – Classical T Tauri Stars (CTTS): circumstellar disk/active mass accretion and mass loss processes/interaction star-disk; ...
When you look up at the night sky, thousands of objects
... holes. Hawking communicates his ideas through an electronic device that converts the movements of muscles in his cheeks into words. Hawking argues that black holes were created at the birth of the universe and have been with us ever since. In the beginning, they may have been no larger than single p ...
... holes. Hawking communicates his ideas through an electronic device that converts the movements of muscles in his cheeks into words. Hawking argues that black holes were created at the birth of the universe and have been with us ever since. In the beginning, they may have been no larger than single p ...
astrophysics - The University of Sydney
... heavier and heavier elements to stave off the next collapse. The core reaches temperatures by converting gravitational energy into thermal energy. Each time the star runs out of fuel, the inexorable collapse due to gravity begins again. The fate of stars from this point depends on their mass. Low mas ...
... heavier and heavier elements to stave off the next collapse. The core reaches temperatures by converting gravitational energy into thermal energy. Each time the star runs out of fuel, the inexorable collapse due to gravity begins again. The fate of stars from this point depends on their mass. Low mas ...
protostars and pre-main
... using guessed central values for P, T, iterate until match with outer boundary conditions. ...
... using guessed central values for P, T, iterate until match with outer boundary conditions. ...
High Resolution Spectroscopy of Stars with GMTNIRS
... “By placing one thermometer within the [solar] red rays, separated by a prism, and another beyond them, he found the temperature of the outside thermometer raised by more than that of the inside.” Humphrey Davy to Davies Giddy 3 July 1800 ...
... “By placing one thermometer within the [solar] red rays, separated by a prism, and another beyond them, he found the temperature of the outside thermometer raised by more than that of the inside.” Humphrey Davy to Davies Giddy 3 July 1800 ...
Lecture15
... ISM, exciting the gas and forming bright, emission line objects. These are HH objects. ...
... ISM, exciting the gas and forming bright, emission line objects. These are HH objects. ...
Misalignment & Nucleosynthesis in Microquasars Yousaf M. Butt , Thomas J. Maccarone
... to, the proposed jet-secondary impacts as the source of the observed Li excess. For instance, as proposed by Guessoum & Kazanas (1999), even for well-aligned microquasars (as well as misaligned ones), it is plausible that surface irradiation of the secondary star by neutrons generated in the accreti ...
... to, the proposed jet-secondary impacts as the source of the observed Li excess. For instance, as proposed by Guessoum & Kazanas (1999), even for well-aligned microquasars (as well as misaligned ones), it is plausible that surface irradiation of the secondary star by neutrons generated in the accreti ...
astro-ph/0502206 PDF
... b) Why is the ratio of Oxygen atoms to Carbon atoms only 2 at the Sun’s surface, when laboratory and theoretical calculations predict a much higher value ? c) If fusion powers the Sun, why does it discard 50 trillion tons of Hydrogen each year as “solar wind” trash, with traces of other elements car ...
... b) Why is the ratio of Oxygen atoms to Carbon atoms only 2 at the Sun’s surface, when laboratory and theoretical calculations predict a much higher value ? c) If fusion powers the Sun, why does it discard 50 trillion tons of Hydrogen each year as “solar wind” trash, with traces of other elements car ...
Big Bang Theory notes
... Turrialba (44 mi E of San Jose) volcano's largest eruption in over a century rained ash over parts of central Costa Rica & prompted the evacuation of some nearby communities. Volcanologist Gino Gonzalez of the CR National Seismological Network said after visiting the volcano's rim that the overnight ...
... Turrialba (44 mi E of San Jose) volcano's largest eruption in over a century rained ash over parts of central Costa Rica & prompted the evacuation of some nearby communities. Volcanologist Gino Gonzalez of the CR National Seismological Network said after visiting the volcano's rim that the overnight ...
The Universe and Galactic Formation
... over time of dust and elements heavier than hydrogen, including those of which living organisms are composed. Dust has played an important role in star formation throughout much of cosmic history. ...
... over time of dust and elements heavier than hydrogen, including those of which living organisms are composed. Dust has played an important role in star formation throughout much of cosmic history. ...
ASTRONOMY
... over time of dust and elements heavier than hydrogen, including those of which living organisms are composed. Dust has played an important role in star formation throughout much of cosmic history. ...
... over time of dust and elements heavier than hydrogen, including those of which living organisms are composed. Dust has played an important role in star formation throughout much of cosmic history. ...
Sizes of Stars - The University of Texas at Dallas
... to figure out the scaled sizes of the different stars for our model from the scale factor of 1 to 10 billion. For example, the diameter of the Sun is 140 billion centimeters. If you divide 140 billion centimeters by 10 billion centimeters, you will get the size of the model Sun, which is 14 centimet ...
... to figure out the scaled sizes of the different stars for our model from the scale factor of 1 to 10 billion. For example, the diameter of the Sun is 140 billion centimeters. If you divide 140 billion centimeters by 10 billion centimeters, you will get the size of the model Sun, which is 14 centimet ...
Detection of Elements at All Three r-process Peaks in the Metal
... residuals. This method of computing these residuals assumes that the r-process produced some fraction of all heavy isotopes in the S.S. except those attributed to s-process nucleosynthesis or inaccessible to the r-process (e.g., Seeger et al. 1965; Cameron 1982; Käppeler et al. 1989). Light n-captu ...
... residuals. This method of computing these residuals assumes that the r-process produced some fraction of all heavy isotopes in the S.S. except those attributed to s-process nucleosynthesis or inaccessible to the r-process (e.g., Seeger et al. 1965; Cameron 1982; Käppeler et al. 1989). Light n-captu ...
Chapter22_New
... I like to use the subject of the size and shape of the galaxy as an example of the way that science often proceeds by fits and starts with some wrong turns. I treat the work of Herschel and Kapteyn, though basically wrong, with respect. 3. The Rotation of the Milky Way Rotation curves for other gala ...
... I like to use the subject of the size and shape of the galaxy as an example of the way that science often proceeds by fits and starts with some wrong turns. I treat the work of Herschel and Kapteyn, though basically wrong, with respect. 3. The Rotation of the Milky Way Rotation curves for other gala ...
Goodbye Big Bang, hello black hole? A new theory of the
... that the universe is expanding (and indeed is getting faster as it expands, possibly due to the mysterious dark energy). The new theory says that "The study could help to show how inflation is triggered by the motion of the universe through a the expansion comes from this 3-D brane's higher-dimensio ...
... that the universe is expanding (and indeed is getting faster as it expands, possibly due to the mysterious dark energy). The new theory says that "The study could help to show how inflation is triggered by the motion of the universe through a the expansion comes from this 3-D brane's higher-dimensio ...
What keeps stars shining? What holds them up? Lecture 14. The
... inside nucleus of atom. The energy is due to the nuclear forces. Iron (56Fe) has the most stable nucleus, so you can (in theory) get energy by transmuting into Iron: Fission: Break up nuclei of high atomic weight into lighter ones (works for elements heavier than Iron) Fusion: Combine ("fuse") small ...
... inside nucleus of atom. The energy is due to the nuclear forces. Iron (56Fe) has the most stable nucleus, so you can (in theory) get energy by transmuting into Iron: Fission: Break up nuclei of high atomic weight into lighter ones (works for elements heavier than Iron) Fusion: Combine ("fuse") small ...
ASTR 1101-001 Spring 2008 - Louisiana State University
... Terminology used throughout Chapter 20 ...
... Terminology used throughout Chapter 20 ...
Star
... Gas clumps together by gravity -> stars Stars produce heavy elements by fusion Stars die and return processed gas to space Enriched gas clumps together by gravity New stars ...
... Gas clumps together by gravity -> stars Stars produce heavy elements by fusion Stars die and return processed gas to space Enriched gas clumps together by gravity New stars ...
The Nature of Evolution - Western Washington University
... as natural selection, acting on the last generation of a given species is the only available genetic information that can be passed on to the next generation of that species and so on throughout time. The effect of repeating this process through time produces cumulative change in the historical subs ...
... as natural selection, acting on the last generation of a given species is the only available genetic information that can be passed on to the next generation of that species and so on throughout time. The effect of repeating this process through time produces cumulative change in the historical subs ...
Announcements
... What is the source of Energy for a Supernova Explosion? a) Chemical Energy? b) Nuclear Energy? c) Gravitational Potential Energy? d) Dark Energy? e) Thermal Kinetic Energy? ...
... What is the source of Energy for a Supernova Explosion? a) Chemical Energy? b) Nuclear Energy? c) Gravitational Potential Energy? d) Dark Energy? e) Thermal Kinetic Energy? ...
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.