Star formation bursts in isolated spiral galaxies
... high-resolution, three-dimensional version of those presented in Sellwood & Carlberg (1984). J. Sellwood kindly supplied us with data on the potential variations by rerunning in three dimensions (and at greater resolution) the time-span between t = 0 and 4 in fig. 2 of Sellwood and Carlberg (1984). ...
... high-resolution, three-dimensional version of those presented in Sellwood & Carlberg (1984). J. Sellwood kindly supplied us with data on the potential variations by rerunning in three dimensions (and at greater resolution) the time-span between t = 0 and 4 in fig. 2 of Sellwood and Carlberg (1984). ...
Educator`s Guide to the Cullman Hall of the Universe, Heilbrunn
... Light tells the story of the universe. Since light takes time to travel, the farther out into space we look, the further back in time we see. When we flip a switch we see the light almost instantly, but sunlight is eight minutes old, light from nearby stars has taken years or centuries to reach us, ...
... Light tells the story of the universe. Since light takes time to travel, the farther out into space we look, the further back in time we see. When we flip a switch we see the light almost instantly, but sunlight is eight minutes old, light from nearby stars has taken years or centuries to reach us, ...
Pulsations in White Dwarfs
... modes in an evolving model with a fixed PG1159 envelope composition (red dots), and that of a model in which stellar winds and gravitational settling are taken into account (black dots). The latter suggests that a GW Vir star (PG1159 spectral type) should again pulsate in its lifetime but, this time ...
... modes in an evolving model with a fixed PG1159 envelope composition (red dots), and that of a model in which stellar winds and gravitational settling are taken into account (black dots). The latter suggests that a GW Vir star (PG1159 spectral type) should again pulsate in its lifetime but, this time ...
The Main Sequence - University of Arizona
... • Steady mass loss (neither of the cases pictured above) usually driven by absorption of photons in bound-bound transitions of metal lines Ý is metallicity dependent – most transitions in metal atoms, so M – depends on current surface z, so self enrichment important – depends on rotation - higher te ...
... • Steady mass loss (neither of the cases pictured above) usually driven by absorption of photons in bound-bound transitions of metal lines Ý is metallicity dependent – most transitions in metal atoms, so M – depends on current surface z, so self enrichment important – depends on rotation - higher te ...
chapter 24 instructor notes
... Milky Way consists of “innumerable” faint stars. In 1718 Halley discovered the proper motions of Arcturus, Sirius, and Aldebaran, and by 1760 Mayer had published proper motions for some 80 stars based upon comparisons of their recorded positions. His results established that the Sun and stars are no ...
... Milky Way consists of “innumerable” faint stars. In 1718 Halley discovered the proper motions of Arcturus, Sirius, and Aldebaran, and by 1760 Mayer had published proper motions for some 80 stars based upon comparisons of their recorded positions. His results established that the Sun and stars are no ...
The early stages of planet formation Ormel, Christiaan Wessel
... How do planets form? It is a simple question but the answer involves an array of diverse physical processes — complex as well as fascinating. It requires, first of all, to realize what planets really are. For centuries, humans were mystified by the ‘wandering stars,’ moving relative to a sky compose ...
... How do planets form? It is a simple question but the answer involves an array of diverse physical processes — complex as well as fascinating. It requires, first of all, to realize what planets really are. For centuries, humans were mystified by the ‘wandering stars,’ moving relative to a sky compose ...
ncam-program-2016 - Cline Observatory
... worlds, which have accreted an envelope of primordial H/He gas. I will explain the essential role of the NASA Transiting Exoplanet Survey Satellite (TESS), scheduled for launch in 2017. David Charbonneau is a Professor of Astronomy at Harvard University. His research focuses on the discovery and cha ...
... worlds, which have accreted an envelope of primordial H/He gas. I will explain the essential role of the NASA Transiting Exoplanet Survey Satellite (TESS), scheduled for launch in 2017. David Charbonneau is a Professor of Astronomy at Harvard University. His research focuses on the discovery and cha ...
ATLASGAL -- The APEX telescope large area survey of the galaxy at
... Context. Thanks to its excellent 5100 m high site in Chajnantor, the Atacama Pathfinder Experiment (APEX) systematically explores the southern sky at submillimeter wavelengths, in both continuum and spectral line emission. Studying continuum emission from interstellar dust is essential to locating t ...
... Context. Thanks to its excellent 5100 m high site in Chajnantor, the Atacama Pathfinder Experiment (APEX) systematically explores the southern sky at submillimeter wavelengths, in both continuum and spectral line emission. Studying continuum emission from interstellar dust is essential to locating t ...
How we know black holes exist
... The key to seeing a shadow, event horizon, or material spiraling into a black hole is using a detector with high resolution. One group, led by Frank Eisenhauer of the Max Planck Institute, plans to use the Very Large Telescope array in Chile with an instrument it’s creating to precisely measure the ...
... The key to seeing a shadow, event horizon, or material spiraling into a black hole is using a detector with high resolution. One group, led by Frank Eisenhauer of the Max Planck Institute, plans to use the Very Large Telescope array in Chile with an instrument it’s creating to precisely measure the ...
Diapositiva 1
... 2- Cool component (T ~ 100 K), also known as HI regions, traced by 21 cm emission line; 3- Cold component (T ~ 10 K), also known as H2 regions, traced by molecular emission. Ionized regions can be divided in two classes: 1- Warm component (T ~ 1000 to 10000 K), also known as HII region; 2- Hot compo ...
... 2- Cool component (T ~ 100 K), also known as HI regions, traced by 21 cm emission line; 3- Cold component (T ~ 10 K), also known as H2 regions, traced by molecular emission. Ionized regions can be divided in two classes: 1- Warm component (T ~ 1000 to 10000 K), also known as HII region; 2- Hot compo ...
Presentation - Copernicus.org
... Solar System properties that depend on birth environment: - evidence of short-lived radionuclides in meteorites - dynamical properties of outer planets and Kuiper Belt ...
... Solar System properties that depend on birth environment: - evidence of short-lived radionuclides in meteorites - dynamical properties of outer planets and Kuiper Belt ...
Astronomy Astrophysics A VLT/FLAMES survey for massive binaries in Westerlund 1 &
... evolution up to and beyond supernova and the resultant production of relativistic remnants. Key words. stars: evolution – stars: early-type – binaries: general ...
... evolution up to and beyond supernova and the resultant production of relativistic remnants. Key words. stars: evolution – stars: early-type – binaries: general ...
The Oort cloud as a remnant of the protosolar nebula
... way than the gaseous and dusty components of the nebula. The atoms and molecules lost their kinetic energy by the well-known mechanism suggested by Hayashi (see his review from 1966, e.g.), but this mechanism could not be efficient with such large bodies as cometary nuclei. If the nuclei were presen ...
... way than the gaseous and dusty components of the nebula. The atoms and molecules lost their kinetic energy by the well-known mechanism suggested by Hayashi (see his review from 1966, e.g.), but this mechanism could not be efficient with such large bodies as cometary nuclei. If the nuclei were presen ...
Black Holes and the Scientific Process
... proof, that the matter when crossing the event horizon does so irreversibly such that no information about the matter can be leaked out[6][7]. This leads to the famous black hole information paradox which contradicts the quantum mechanics paradigm in which a wave function that defines a particle wil ...
... proof, that the matter when crossing the event horizon does so irreversibly such that no information about the matter can be leaked out[6][7]. This leads to the famous black hole information paradox which contradicts the quantum mechanics paradigm in which a wave function that defines a particle wil ...
Introduction to Astronomy
... Mass: 1012 solar masses Center: Direction: α = 17.8h, δ = -29° (Sagittarius) Distance: 29,000 lt. yrs. Diameter: 326,000 lt. yrs. Velocity: 370 miles/sec relative to 3°K background radiation toward α = 10h, δ = -20° (southeast Hydra) ...
... Mass: 1012 solar masses Center: Direction: α = 17.8h, δ = -29° (Sagittarius) Distance: 29,000 lt. yrs. Diameter: 326,000 lt. yrs. Velocity: 370 miles/sec relative to 3°K background radiation toward α = 10h, δ = -20° (southeast Hydra) ...
Origin of the Elements
... How is Deuterium Formed? Deuterium is formed when hydrogen atoms disintegrate into protons, which break down into a neutron and a positron, a positively charged electron: ...
... How is Deuterium Formed? Deuterium is formed when hydrogen atoms disintegrate into protons, which break down into a neutron and a positron, a positively charged electron: ...
Lecture 16
... starbursts. It is still being argued how important they are in spiral galaxy formation. – Mergers can transform spiral galaxies into an elliptical galaxy – thus ellipitical galaxies are typically found in the centers of galaxy clusters. Collisions thought to be very important in elliptical galaxy f ...
... starbursts. It is still being argued how important they are in spiral galaxy formation. – Mergers can transform spiral galaxies into an elliptical galaxy – thus ellipitical galaxies are typically found in the centers of galaxy clusters. Collisions thought to be very important in elliptical galaxy f ...
Milky Way is bigger - Intranet Sint
... Milky Way is bigger than thought, study says WASHINGTON (AP) — Take that, Andromeda! For decades, astronomers thought when it came to the major galaxies in Earth's cosmic neighborhood, our Milky Way was a weak sister to the larger Andromeda. Not anymore. The Milky Way is considerably larger, bulkier ...
... Milky Way is bigger than thought, study says WASHINGTON (AP) — Take that, Andromeda! For decades, astronomers thought when it came to the major galaxies in Earth's cosmic neighborhood, our Milky Way was a weak sister to the larger Andromeda. Not anymore. The Milky Way is considerably larger, bulkier ...
No Slide Title - Harvard-Smithsonian Center for Astrophysics
... Coronal loops: MHD turbulent heating • Cranmer (2009) modeled equatorial zones of T Tauri stars as a collection of closed loops, energized by “footpoint shaking” (via blob-impact surface turbulence). ...
... Coronal loops: MHD turbulent heating • Cranmer (2009) modeled equatorial zones of T Tauri stars as a collection of closed loops, energized by “footpoint shaking” (via blob-impact surface turbulence). ...
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.