The Ionization Parameter A convenient way of thinking about the
... and assumptions that work for H II regions begin to break down. Specifically, 1) Many of the photons emanating from the ionizing source have extremely high energy. For these photons, the cross section for hydrogen absorption is small; instead, metals such as C,N,O, and Ne dominate the opacity. Moreo ...
... and assumptions that work for H II regions begin to break down. Specifically, 1) Many of the photons emanating from the ionizing source have extremely high energy. For these photons, the cross section for hydrogen absorption is small; instead, metals such as C,N,O, and Ne dominate the opacity. Moreo ...
Sun, Earth, Moon and Beyond
... Models help us to think about how things work or why things happen. Models can be conceptual (drawings, descriptions, etc.) or physical (3-D), but they all have limitations. Because of those limitations, models may convey misleading information or possess characteristics that are inaccurate. Grade 3 ...
... Models help us to think about how things work or why things happen. Models can be conceptual (drawings, descriptions, etc.) or physical (3-D), but they all have limitations. Because of those limitations, models may convey misleading information or possess characteristics that are inaccurate. Grade 3 ...
RAPID MASS ACCRETION IN THE SYMBIOTIC STAR AG DRA T
... The temperature of the hot component of AG Dra in the quiescent stage is about 150000 K which is derived from the intensities of He H 4686 and He 14471 relative to Hg obtained on August 5, 1980 (Blair et al., 1983) using the formula of Iijima (1982). The luminosity of the hot component in the ultrav ...
... The temperature of the hot component of AG Dra in the quiescent stage is about 150000 K which is derived from the intensities of He H 4686 and He 14471 relative to Hg obtained on August 5, 1980 (Blair et al., 1983) using the formula of Iijima (1982). The luminosity of the hot component in the ultrav ...
100 Greatest Discoveries - Mr-Hubeny
... How did this discovery change the study of astronomy? Our solar system is just an island in a huge universe. 7. General Relativity (1915 – 1919) Albert Einstein unveils his theory of general relativity in which he proposes that mass warps both time and space, therefore large masses can bend light. T ...
... How did this discovery change the study of astronomy? Our solar system is just an island in a huge universe. 7. General Relativity (1915 – 1919) Albert Einstein unveils his theory of general relativity in which he proposes that mass warps both time and space, therefore large masses can bend light. T ...
galaxy phenomenology
... SDSS images of spiral galaxies, selected according to classifications in NED to be Sa–Sd (including barred types). The images are sorted by absolute magnitude in the horizontal direction, ranging between Mr − 5 log10 h ∼ −18.5 and −22 from left to right, and g − r color in the vertical direction, ra ...
... SDSS images of spiral galaxies, selected according to classifications in NED to be Sa–Sd (including barred types). The images are sorted by absolute magnitude in the horizontal direction, ranging between Mr − 5 log10 h ∼ −18.5 and −22 from left to right, and g − r color in the vertical direction, ra ...
Document
... • Should have been much fainter when life arose – Solar evolution models predict this – Roughly 25% less solar energy flux on Earth – Would have caused a 7% temperature drop • Corresponds to ~20 degrees celsius colder ...
... • Should have been much fainter when life arose – Solar evolution models predict this – Roughly 25% less solar energy flux on Earth – Would have caused a 7% temperature drop • Corresponds to ~20 degrees celsius colder ...
Cosmic Rays and Plasma Astrophysics
... information on the solar system abundances come from studies of meteorites, which are believed to be representative of the composition in the early solar system (as opposed to Earth, for example, where billions of years of chemical reactions have influenced the composition). These studies have been ...
... information on the solar system abundances come from studies of meteorites, which are believed to be representative of the composition in the early solar system (as opposed to Earth, for example, where billions of years of chemical reactions have influenced the composition). These studies have been ...
talk-tutorial - Helioseismic and Magnetic Imager
... magnetically connected to each other in the dynamo region, or are they all separate? How do we relate “active longitudes” and “active nests” to a magnetic picture of the large-scale dynamo region at the base of the convection zone? Is the magnetic flux that gives birth to active regions in a smooth, ...
... magnetically connected to each other in the dynamo region, or are they all separate? How do we relate “active longitudes” and “active nests” to a magnetic picture of the large-scale dynamo region at the base of the convection zone? Is the magnetic flux that gives birth to active regions in a smooth, ...
Document
... • The luminosity of a star represents the amount of energy emitted per second. There must be a source of this energy, and it cannot last forever. • The amount of “fuel” a star has is proportional to its initial mass. • The length of time the fuel can be spent is equal to the amount of fuel divided b ...
... • The luminosity of a star represents the amount of energy emitted per second. There must be a source of this energy, and it cannot last forever. • The amount of “fuel” a star has is proportional to its initial mass. • The length of time the fuel can be spent is equal to the amount of fuel divided b ...
T3-W10-0501student
... The brightness of a star is based on both its temperature and how big it is Giants ...
... The brightness of a star is based on both its temperature and how big it is Giants ...
Enormous Eruption of 2.2 X-class Solar Flares on 10th June 2014
... around 500 MHz to lower frequencies and eject high energy electrons away from the Sun at about 1/4 the speed of light. This factor is due to the motion of the plasma and other particles through the convection mechanism inside the Sun [9]. Meanwhile, metric radio burst is normally a non-thermal parti ...
... around 500 MHz to lower frequencies and eject high energy electrons away from the Sun at about 1/4 the speed of light. This factor is due to the motion of the plasma and other particles through the convection mechanism inside the Sun [9]. Meanwhile, metric radio burst is normally a non-thermal parti ...
Slide 1
... natural phenomena. The Natural History of Planet Earth is the product of nearly five billion years of global evolutionary processes that followed the first nine billion years of cosmic evolution. Complexity grows when energy flows in natural systems because simple building blocks evolve into complex ...
... natural phenomena. The Natural History of Planet Earth is the product of nearly five billion years of global evolutionary processes that followed the first nine billion years of cosmic evolution. Complexity grows when energy flows in natural systems because simple building blocks evolve into complex ...
Mixing in massive stellar mergers
... The guiding idea of our method is Archimedes’ principle. To determine how fluid will redistribute itself when brought out of equilibrium, perhaps by a stellar merger, we need to consider densities: a fluid element with a greater density than its environment will accelerate downward, while one with a ...
... The guiding idea of our method is Archimedes’ principle. To determine how fluid will redistribute itself when brought out of equilibrium, perhaps by a stellar merger, we need to consider densities: a fluid element with a greater density than its environment will accelerate downward, while one with a ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... e) The stars in the disk are forming more slowly (due to the initial lower gas densities than the bulge) =⇒ they have time to absorb more heavy elements from the evolution of older stars =⇒ metal abundance is so high that we call these a new population, the Pop I stars. f ) Longer formation rates en ...
... e) The stars in the disk are forming more slowly (due to the initial lower gas densities than the bulge) =⇒ they have time to absorb more heavy elements from the evolution of older stars =⇒ metal abundance is so high that we call these a new population, the Pop I stars. f ) Longer formation rates en ...
Wednesday, April 23 - Otterbein University
... period-luminosity relationship for Cepheid variables • Period thus tells us luminosity, which then tells us the distance • Since Cepheids are ...
... period-luminosity relationship for Cepheid variables • Period thus tells us luminosity, which then tells us the distance • Since Cepheids are ...
The Qur`an and Laws of Planetary Motion
... moving around the sun in an elliptic orbit and the moon (and all the celestial bodies) are mentioned since the ellipse has two focus, so the sun is at (cf., V-6 to V-8), the word “swim” is used for the one of the foci of the ellipse”. movements of the celestial bodies. This word may be referred to a ...
... moving around the sun in an elliptic orbit and the moon (and all the celestial bodies) are mentioned since the ellipse has two focus, so the sun is at (cf., V-6 to V-8), the word “swim” is used for the one of the foci of the ellipse”. movements of the celestial bodies. This word may be referred to a ...
ASTR2050 Spring 2005 •
... from stars. We see that it is connected to temperature and we approximate it by “blackbody radiation”. However, there is also “discrete radiation” obvious in stellar spectra. These “spectral lines” give clues to the elements which make up the star. Historically, this is how astronomers came to class ...
... from stars. We see that it is connected to temperature and we approximate it by “blackbody radiation”. However, there is also “discrete radiation” obvious in stellar spectra. These “spectral lines” give clues to the elements which make up the star. Historically, this is how astronomers came to class ...
