7 November 2012 X-ray Astrophysics
... The Discovery of X-rays X-radiation was discovered in 1895 by Wilhelm Röntgen, a German physics professor at the University of Würzburg, and for this he was awarded the first Nobel Prize for physics, in 1901. The (originally temporary) name of ‘X-rays’ reflects their unknown and mysterious nature at ...
... The Discovery of X-rays X-radiation was discovered in 1895 by Wilhelm Röntgen, a German physics professor at the University of Würzburg, and for this he was awarded the first Nobel Prize for physics, in 1901. The (originally temporary) name of ‘X-rays’ reflects their unknown and mysterious nature at ...
Composition and Mass Loss
... expansion leads to lowering of density until the material becomes some optically thin it cannot detected ...
... expansion leads to lowering of density until the material becomes some optically thin it cannot detected ...
File 11 - School of Astronomy, IPM
... Often low surface brightness, so hard to find. More than one family of objects: • Gas-poor, passive (dE and dSph) • Gas rich, star forming • Why are dwarf galaxies important? • Majority of galaxies are dwarfs! • Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds cam ...
... Often low surface brightness, so hard to find. More than one family of objects: • Gas-poor, passive (dE and dSph) • Gas rich, star forming • Why are dwarf galaxies important? • Majority of galaxies are dwarfs! • Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds cam ...
Disk Instability Models
... Heretical Explanation for Microlensing Planets • Most stars form in regions of high-mass star formation (e.g., Orion, Carina) where their protoplanetary disks can be photoevaporated away by nearby O stars. • Photoevaporation converts gas giant protoplanets into ice giants if the protoplanet orbit ...
... Heretical Explanation for Microlensing Planets • Most stars form in regions of high-mass star formation (e.g., Orion, Carina) where their protoplanetary disks can be photoevaporated away by nearby O stars. • Photoevaporation converts gas giant protoplanets into ice giants if the protoplanet orbit ...
Document
... • Measuring distances on Earth is easy. On galactic scales it’s a bit harder... • Hubble’s law relates distance to redshift, but how do you measure Hubbles constant? • There is no simple way to measure the distance to anywhere. Different indicators must be used for different distances • The ‘distanc ...
... • Measuring distances on Earth is easy. On galactic scales it’s a bit harder... • Hubble’s law relates distance to redshift, but how do you measure Hubbles constant? • There is no simple way to measure the distance to anywhere. Different indicators must be used for different distances • The ‘distanc ...
Power Point Presentation
... accompanied by planetary nebulae More massive stars form red supergiants Red supergiants undergo supernova explosions, often leaving behind a stellar core which is a neutron star, or perhaps a black hole (see Lecture 2) ...
... accompanied by planetary nebulae More massive stars form red supergiants Red supergiants undergo supernova explosions, often leaving behind a stellar core which is a neutron star, or perhaps a black hole (see Lecture 2) ...
1. Our Place in the Universe - Department of Physics & Astronomy
... • at an average distance of 1 AU ≈ 150 million km. • with Earth’s axis tilted by 23.5º (pointing to Polaris) • and rotating in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
... • at an average distance of 1 AU ≈ 150 million km. • with Earth’s axis tilted by 23.5º (pointing to Polaris) • and rotating in the same direction it orbits, counterclockwise as viewed from above the North Pole. ...
Stars - gilbertmath.com
... The explosion releases enough ____________ to cause the ________ and other elements to fuse in various combinations. It is in this way that all of the ________________ of the ________________ __________ have been formed. As the elements are sent out into space, some of the debris and elements f ...
... The explosion releases enough ____________ to cause the ________ and other elements to fuse in various combinations. It is in this way that all of the ________________ of the ________________ __________ have been formed. As the elements are sent out into space, some of the debris and elements f ...
Expanding Earth and Static Universe: Two Papers of 1935
... Plaskett. In his influential The Realm of the Universe, Hubble (1936, p. 122) wrote, “judgement may be suspended until it is known from observations whether or not red-shifts do actually represent motion.” The first and most influential alternative to galactic recession was proposed as early as Augu ...
... Plaskett. In his influential The Realm of the Universe, Hubble (1936, p. 122) wrote, “judgement may be suspended until it is known from observations whether or not red-shifts do actually represent motion.” The first and most influential alternative to galactic recession was proposed as early as Augu ...
Accretion Disks
... a time dt, then we see a change over a timescale t+dt. This gives a maximum value for the diameter, d, because we know that our measured timescale must be larger than the light crossing time. ...
... a time dt, then we see a change over a timescale t+dt. This gives a maximum value for the diameter, d, because we know that our measured timescale must be larger than the light crossing time. ...
Lesson Plan G2 The Stars
... Hands-on Activity Part One: 10 minutes Hands-on Activity Part Two: 30 minutes Hands-on Activity Part Three: 10 minutes Starry Night Computer Exercise: 35-45 minutes ...
... Hands-on Activity Part One: 10 minutes Hands-on Activity Part Two: 30 minutes Hands-on Activity Part Three: 10 minutes Starry Night Computer Exercise: 35-45 minutes ...
DTU 8e Chap 11 Characterizing Stars
... the Sun? How luminous is the Sun compared with other stars? What colors are stars, and why do they have these colors? Are brighter stars hotter than dimmer stars? Compared to the Sun, what sizes are other stars? Are most stars isolated from other stars, as the Sun is? ...
... the Sun? How luminous is the Sun compared with other stars? What colors are stars, and why do they have these colors? Are brighter stars hotter than dimmer stars? Compared to the Sun, what sizes are other stars? Are most stars isolated from other stars, as the Sun is? ...
What is a planet? - X-ray and Observational Astronomy Group
... • describe the formation of the extra-solar planets: – (I) Planets form from dust which agglomerates into cores which then accrete gas from a disc. – (II) A gravitational instability in a protostellar disc creates a number of giant planets. ...
... • describe the formation of the extra-solar planets: – (I) Planets form from dust which agglomerates into cores which then accrete gas from a disc. – (II) A gravitational instability in a protostellar disc creates a number of giant planets. ...
Baryons at Low Densities: The Stellar Halos around Galaxies
... types and environments are also necessary. Stellar halos of the Milky Way and Andromeda The Milky Way and Andromeda are the two nearest large galaxies whose halos are being extensively studied. In his review of the Milky Way stellar halo, Wyn Evans quoted the fundamental observation from Eggen, Lynd ...
... types and environments are also necessary. Stellar halos of the Milky Way and Andromeda The Milky Way and Andromeda are the two nearest large galaxies whose halos are being extensively studied. In his review of the Milky Way stellar halo, Wyn Evans quoted the fundamental observation from Eggen, Lynd ...
PHYSICS – Astrophysics Section I
... high pressure gases, where there is constant interaction between atoms and molecules. The peak wavelength and range of wavelengths of the continuous spectrum is given by the Planck black-body radiation curves. Emission Spectrum An emission spectrum appears as multiple bright lines against a dark bac ...
... high pressure gases, where there is constant interaction between atoms and molecules. The peak wavelength and range of wavelengths of the continuous spectrum is given by the Planck black-body radiation curves. Emission Spectrum An emission spectrum appears as multiple bright lines against a dark bac ...
3-color photometry of stellar cluster - Kiepenheuer
... If many stars are plotted it is immediately clear that stars appear in specific ranges of these diagrams. In the center there is a diagonal where many stars are situated, these diagonal is called the main sequence (Voigt, 1969). The main sequence ranges from bright, bluish-white O, A and B stars to ...
... If many stars are plotted it is immediately clear that stars appear in specific ranges of these diagrams. In the center there is a diagonal where many stars are situated, these diagonal is called the main sequence (Voigt, 1969). The main sequence ranges from bright, bluish-white O, A and B stars to ...
First young loose association in the northern hemisphere?
... !!Only the star with a strong H# emission (Fig. 2, left panel) displays a near- and far-infrared excess (Fig. 2, right panel), which is typical of class II infrared sources, i.e. T Tauri stars (TTS) still surrounded by an accretion disc. Moreover we can characterize its properties because this stars ...
... !!Only the star with a strong H# emission (Fig. 2, left panel) displays a near- and far-infrared excess (Fig. 2, right panel), which is typical of class II infrared sources, i.e. T Tauri stars (TTS) still surrounded by an accretion disc. Moreover we can characterize its properties because this stars ...
strolympics - Chandra X
... acceleration caused by gravity. On the Earth’s surface, there’s a consistent tug from gravity. However, if you venture to other planets where gravitational forces are different or into space itself where gravity is virtually non-existent, then that object’s weight will change. Mass, however, does no ...
... acceleration caused by gravity. On the Earth’s surface, there’s a consistent tug from gravity. However, if you venture to other planets where gravitational forces are different or into space itself where gravity is virtually non-existent, then that object’s weight will change. Mass, however, does no ...
Globular Clusters Dynamic Lives The
... All this is just a small part of the ongoing saga of trying to understand these fascinating objects and their evolution. Globular clusters are fun to observe from Earth. But consider some lucky creatures living on a planet in the core of a rich globular cluster — now that would be a starry sky! ...
... All this is just a small part of the ongoing saga of trying to understand these fascinating objects and their evolution. Globular clusters are fun to observe from Earth. But consider some lucky creatures living on a planet in the core of a rich globular cluster — now that would be a starry sky! ...
5. Energy Production and Transport
... The only way a nucleus can overcome the Coulomb barrier is for it to increase its kinetic energy. We saw when discussing energy generation, that the average kinetic energy of a nucleus is 3kT/2. In order to overcome the Coulomb barrier, therefore, the temperature would have to be 1.1x1010K. This is ...
... The only way a nucleus can overcome the Coulomb barrier is for it to increase its kinetic energy. We saw when discussing energy generation, that the average kinetic energy of a nucleus is 3kT/2. In order to overcome the Coulomb barrier, therefore, the temperature would have to be 1.1x1010K. This is ...
5th_state_of_matter - the Electric Universe!
... emit more heat than 800 000 suns (equ.1). Moreover, these “magnetic tubes” would be strongly deformed via their transport from the dynamo to the surface through the boiling layers (Schrijwer and Title). TRACE clearly shows the parallel flight of iron ions, from surface to surface (Fig.3). The ionisa ...
... emit more heat than 800 000 suns (equ.1). Moreover, these “magnetic tubes” would be strongly deformed via their transport from the dynamo to the surface through the boiling layers (Schrijwer and Title). TRACE clearly shows the parallel flight of iron ions, from surface to surface (Fig.3). The ionisa ...