Protoplanetary Discs
... ⇒ particle looses J as it moves further in outer particle angular velocity is slightly increased ⇒ particle gains J as it moves further out If there is viscosity, particles at smaller R will drag particles at larger R, trying to increase those particles angular velocity. At the same time, particles ...
... ⇒ particle looses J as it moves further in outer particle angular velocity is slightly increased ⇒ particle gains J as it moves further out If there is viscosity, particles at smaller R will drag particles at larger R, trying to increase those particles angular velocity. At the same time, particles ...
CONSTELLATION PERSEUS The constellation
... for the second time to have a radius around 150 times that of our Sun. Seven stars in Perseus have been found to have planetary systems. V718 Persei is a star in the young open cluster IC 348 that appears to be periodically eclipsed by a giant planet every 4.7 years. This has been inferred to be an ...
... for the second time to have a radius around 150 times that of our Sun. Seven stars in Perseus have been found to have planetary systems. V718 Persei is a star in the young open cluster IC 348 that appears to be periodically eclipsed by a giant planet every 4.7 years. This has been inferred to be an ...
Present-day cosmic abundances - Dr. Karl Remeis
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
Sample pages 1 PDF
... Do you remember the first night that you stood for the very first time under a clear night sky and gazed with bewilderment at its beauty? And did you think something like this as you watched: ‘‘How many stars there are! How can anyone make any sense of this mass of stars?’’ An attentive observer wil ...
... Do you remember the first night that you stood for the very first time under a clear night sky and gazed with bewilderment at its beauty? And did you think something like this as you watched: ‘‘How many stars there are! How can anyone make any sense of this mass of stars?’’ An attentive observer wil ...
starry night companion
... spend some time using Starry Night and making their own observations, before returning to the rest of this book. The next four sections go into more detail. Section two will help you get the most out of your observing, no matter what you are looking at. It has observational tips, hints on choosing b ...
... spend some time using Starry Night and making their own observations, before returning to the rest of this book. The next four sections go into more detail. Section two will help you get the most out of your observing, no matter what you are looking at. It has observational tips, hints on choosing b ...
An Expanded View of the Universe
... Black holes: what was their role in shaping the Universe? Black holes have puzzled physicists and astronomers since they were first postulated in relativistic form a century ago by Karl Schwarzschild. Observations have demonstrated that these bizarre objects really exist. And on a grand scale, too: ...
... Black holes: what was their role in shaping the Universe? Black holes have puzzled physicists and astronomers since they were first postulated in relativistic form a century ago by Karl Schwarzschild. Observations have demonstrated that these bizarre objects really exist. And on a grand scale, too: ...
Stellarium User Guide - Skolekonsulenterne.dk
... planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. S ...
... planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. S ...
Chapter 15 Stars, Galaxies and Universe
... The Big Bang Theory, continued • The big bang theory is the theory that all matter and energy in the universe was compressed into an extremely small volume that about 14 billion years ago exploded and began expanding in all directions. • Scientists believe that radio “noise” coming from all directio ...
... The Big Bang Theory, continued • The big bang theory is the theory that all matter and energy in the universe was compressed into an extremely small volume that about 14 billion years ago exploded and began expanding in all directions. • Scientists believe that radio “noise” coming from all directio ...
MPA Anniversary Brochure - Max Planck Institute for Astrophysics
... traditional optical domain to all parts of the electromagnetic spectrum, and even beyond, to neutrinos, energetic particles and, perhaps soon, to gravitational waves. Telescopes, traditionally sited at university or institute observatories, evolved first into national facilities on remote sites, and ...
... traditional optical domain to all parts of the electromagnetic spectrum, and even beyond, to neutrinos, energetic particles and, perhaps soon, to gravitational waves. Telescopes, traditionally sited at university or institute observatories, evolved first into national facilities on remote sites, and ...
Analysis of Stellar Activity and Orbital Dynamics in Extrasolar
... tems is the key to understand our own grains and asteroids and finally plancosmic history. However, before we take etary embryos within several million a look at more distant worlds to study years. However, recent results indicate their dynamics under the influence of that some iron meteorites and a ...
... tems is the key to understand our own grains and asteroids and finally plancosmic history. However, before we take etary embryos within several million a look at more distant worlds to study years. However, recent results indicate their dynamics under the influence of that some iron meteorites and a ...
MPhil Thesis - Final - Suzanne Knight
... A large sample of white dwarfs within the solar neighbourhood has been examined to search for resolved common proper motion companions. The luminosity of these white dwarfs make them ideal candidates for detecting low mass objects such as brown dwarfs and gas giant planets. ! Theoretical predictions ...
... A large sample of white dwarfs within the solar neighbourhood has been examined to search for resolved common proper motion companions. The luminosity of these white dwarfs make them ideal candidates for detecting low mass objects such as brown dwarfs and gas giant planets. ! Theoretical predictions ...
Chapter J2
... objects in the sky. If viewed through an optical telescope, a quasar appears as a small, dim star. Quasars are the most distant objects that have been observed from Earth. But many quasars are hundreds of times brighter than the brightest galaxy. Because quasars are so far away from Earth and yet ar ...
... objects in the sky. If viewed through an optical telescope, a quasar appears as a small, dim star. Quasars are the most distant objects that have been observed from Earth. But many quasars are hundreds of times brighter than the brightest galaxy. Because quasars are so far away from Earth and yet ar ...
The formation and destruction of molecular clouds and galactic star
... We first model the growth of molecular clouds. Inoue & Inutsuka (2012) showed that we need multiple episodes of compression of HI clouds to create molecular clouds. According to the standard picture of supernova-regulated ISM dynamics (e.g., McKee & Ostriker 1977), the typical timescale between cons ...
... We first model the growth of molecular clouds. Inoue & Inutsuka (2012) showed that we need multiple episodes of compression of HI clouds to create molecular clouds. According to the standard picture of supernova-regulated ISM dynamics (e.g., McKee & Ostriker 1977), the typical timescale between cons ...
PHY216_lect3_2014_sub
... Universal Time is the name by which Greenwich Mean Time (GMT) became known for scientific purposes in 1928. UT is based on the daily rotation of the Earth. However, the Earth’s rotation is somewhat irregular and can therefore no longer be used as a precise system of time. Versions of UT: UT1: • The ...
... Universal Time is the name by which Greenwich Mean Time (GMT) became known for scientific purposes in 1928. UT is based on the daily rotation of the Earth. However, the Earth’s rotation is somewhat irregular and can therefore no longer be used as a precise system of time. Versions of UT: UT1: • The ...
Pair instability supernovae: Evolution, explosion, nucleosynthesis
... supernovae are exploding in the visible Universe each second, and at present there are a few of them discovered every day. The average peak luminosity of a supernova competes with that of entire galaxies. Supernovae are the main contributor of heavy elements, energy and momentum to the interstellar ...
... supernovae are exploding in the visible Universe each second, and at present there are a few of them discovered every day. The average peak luminosity of a supernova competes with that of entire galaxies. Supernovae are the main contributor of heavy elements, energy and momentum to the interstellar ...
lecture course
... pressureless equation of state. This is what distinguishes it from dark energy, which makes up the other 70% or so. This dark matter must be cold in order to form galaxies, since hot dark matter (like neutrinos) will free-stream out of perturbations in the cosmological fluid at early times. By “cold ...
... pressureless equation of state. This is what distinguishes it from dark energy, which makes up the other 70% or so. This dark matter must be cold in order to form galaxies, since hot dark matter (like neutrinos) will free-stream out of perturbations in the cosmological fluid at early times. By “cold ...
Star formation rates and efficiencies in the Galactic Centre
... a difficult quantity to determine, as inferences of the threedimensional structure have to be made in order to convert two-dimensional line-of-sight column density measurements. The measured column density of hydrogen in the CMZ appears to be at least an order of magnitude higher than clouds within ...
... a difficult quantity to determine, as inferences of the threedimensional structure have to be made in order to convert two-dimensional line-of-sight column density measurements. The measured column density of hydrogen in the CMZ appears to be at least an order of magnitude higher than clouds within ...
1 Discovery of peculiar periodic spectral
... the lack of detections is caused by their extendedness. However this cannot be, because the SDSS spectra are obtained with optical fibers that have a 3 arcseconds diameter, which is comparable to the average diameter of stellar images caused by the atmospheric seeing. The comparison of these 2 figur ...
... the lack of detections is caused by their extendedness. However this cannot be, because the SDSS spectra are obtained with optical fibers that have a 3 arcseconds diameter, which is comparable to the average diameter of stellar images caused by the atmospheric seeing. The comparison of these 2 figur ...
Formation of Molecular Clouds and Global Conditions for Star
... to be supported against gravitational collapse, and in virial equilibrium. Magnetic fields were generally favored as a means of support (Shu et al. 1987). Turbulence would dissipate unless replenished, whilst rotational support was found to be insufficient (e.g., Silk 1980). More recently these conc ...
... to be supported against gravitational collapse, and in virial equilibrium. Magnetic fields were generally favored as a means of support (Shu et al. 1987). Turbulence would dissipate unless replenished, whilst rotational support was found to be insufficient (e.g., Silk 1980). More recently these conc ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.