Astronomy 1001/1005 Final Exam (250 points)
... You will NOT get your bubble sheet back One page of notes is allowed Use a #2 pencil on the bubble sheet. Make your bubbles dark and neat. There are 50 multiple choice problems and your choice of 5 short answer questions with point values given for each. ...
... You will NOT get your bubble sheet back One page of notes is allowed Use a #2 pencil on the bubble sheet. Make your bubbles dark and neat. There are 50 multiple choice problems and your choice of 5 short answer questions with point values given for each. ...
The Milky Way - Midlandstech
... Mmax ~ 100 solar masses a) More massive clouds fragment into smaller pieces during star formation. ...
... Mmax ~ 100 solar masses a) More massive clouds fragment into smaller pieces during star formation. ...
Today`s Powerpoint
... fusion goes into re-expanding and cooling the core. Takes only a few seconds! This slows fusion, so star gets dimmer again. - Then stable He -> C burning. Still have H -> He shell burning ...
... fusion goes into re-expanding and cooling the core. Takes only a few seconds! This slows fusion, so star gets dimmer again. - Then stable He -> C burning. Still have H -> He shell burning ...
(a) Because the core of heavy-mass star never reaches high enough
... 15. Which one of the following is the right set of descriptions for the “Solar Thermostat”? (a) When core temperature increases, pressure increases. Higher pressure expands the system which then cools the core. (b) When core temperature decreases, pressure increases. Higher pressure expands the sys ...
... 15. Which one of the following is the right set of descriptions for the “Solar Thermostat”? (a) When core temperature increases, pressure increases. Higher pressure expands the system which then cools the core. (b) When core temperature decreases, pressure increases. Higher pressure expands the sys ...
CONSTELLATION CANES VENATICI the two hunting dogs Canes
... voids. It was discovered in 1988 in a deep-sky survey. • Canes Venatici contains five Messier objects, including four galaxies. The more significant are • the Whirlpool Galaxy (M51, NGC 5194) and NGC 5195, a small barred spiral galaxy that is seen face on. This was the first galaxy recognised as hav ...
... voids. It was discovered in 1988 in a deep-sky survey. • Canes Venatici contains five Messier objects, including four galaxies. The more significant are • the Whirlpool Galaxy (M51, NGC 5194) and NGC 5195, a small barred spiral galaxy that is seen face on. This was the first galaxy recognised as hav ...
AST121 Introduction to Astronomy
... • eclipsing binaries – one star eclipses the other causes a change in its brightness ...
... • eclipsing binaries – one star eclipses the other causes a change in its brightness ...
Chapter 10 Measuring the Stars: Giants, Dwarfs, and the Main
... • Radial - along our line of sight * ___________________ - annual movement of a star across the sky as seen from Earth • _____________________ has the largest known proper motion of any star – 10.3"/year – Most stars have proper motions less than 1”/year ...
... • Radial - along our line of sight * ___________________ - annual movement of a star across the sky as seen from Earth • _____________________ has the largest known proper motion of any star – 10.3"/year – Most stars have proper motions less than 1”/year ...
Grade 9 Unit 4: Space
... 1. What part of the Sun’s atmosphere is visible only during a total solar eclipse? A. corona B. solar flare C. solar prominence D. sunspot 2. What are the two most common elements found in the Sun? A. hydrogen and helium B. neon and magnesium C. oxygen and iron D. silicon and chlorine 3. Which of th ...
... 1. What part of the Sun’s atmosphere is visible only during a total solar eclipse? A. corona B. solar flare C. solar prominence D. sunspot 2. What are the two most common elements found in the Sun? A. hydrogen and helium B. neon and magnesium C. oxygen and iron D. silicon and chlorine 3. Which of th ...
Introduction to the HR Diagram
... The Hertzsprung-Russell diagram, or H-R diagram, is the periodic table of the stars. It was discovered that when the luminosity (absolute magnitude) of stars is plotted against their temperature (stellar classification) the stars are not randomly distributed on the graph but are mostly restricted to ...
... The Hertzsprung-Russell diagram, or H-R diagram, is the periodic table of the stars. It was discovered that when the luminosity (absolute magnitude) of stars is plotted against their temperature (stellar classification) the stars are not randomly distributed on the graph but are mostly restricted to ...
v1 - ESO
... In 1936 Edwin Hubble presented his tuning fork diagram classifying the different types of galaxy to be found in the Universe. This was the first attempt to find a pattern in the properties of different systems and thus search for a common evolutionary link. Elliptical galaxies appear to be shaped pr ...
... In 1936 Edwin Hubble presented his tuning fork diagram classifying the different types of galaxy to be found in the Universe. This was the first attempt to find a pattern in the properties of different systems and thus search for a common evolutionary link. Elliptical galaxies appear to be shaped pr ...
March 2011
... through all the stages we can see happening now in the clusters around us. After 4.3 billion years the siblings of our Sun have now moved so far apart and so far away from us that we cannot identify them easily. It would however be possible to identify the family of our Sun if we could see them. All ...
... through all the stages we can see happening now in the clusters around us. After 4.3 billion years the siblings of our Sun have now moved so far apart and so far away from us that we cannot identify them easily. It would however be possible to identify the family of our Sun if we could see them. All ...
Interpreting the HR diagram of stellar clusters
... If we believe our theoretical models of stellar evolution, then we can use these theoretical HR diagrams to determine the age of any particular cluster of stars. We simply compare the observed HR diagram to the theoretical diagram, paying special attention to the upper end of the main sequence. Here ...
... If we believe our theoretical models of stellar evolution, then we can use these theoretical HR diagrams to determine the age of any particular cluster of stars. We simply compare the observed HR diagram to the theoretical diagram, paying special attention to the upper end of the main sequence. Here ...
The Life Cycle of Stars
... Centauri. Based on its mass, will our sun be around for a while? Approximately how long before our sun consumes the inner planets of our solar system? Why would it do this? What forces (interactions) are happening to cause this? Realize that once our Sun starts to run out of hydrogen fuel and has ex ...
... Centauri. Based on its mass, will our sun be around for a while? Approximately how long before our sun consumes the inner planets of our solar system? Why would it do this? What forces (interactions) are happening to cause this? Realize that once our Sun starts to run out of hydrogen fuel and has ex ...
“Crossroads of Astronomy.” Talk about Five Remarkable
... Showed that the great variation in stellar absorption lines was due to different amounts of atomic excitation and ionization (different temperatures), not different abundances of elements. She correctly concluded that silicon, carbon, and other common metals seen in the sun were found in about the s ...
... Showed that the great variation in stellar absorption lines was due to different amounts of atomic excitation and ionization (different temperatures), not different abundances of elements. She correctly concluded that silicon, carbon, and other common metals seen in the sun were found in about the s ...
Active Galactic Nuclei - University of Toronto
... thru our 20-inch telescope working at F/5.5. The field of view is about 15x15 arc minutes. ...
... thru our 20-inch telescope working at F/5.5. The field of view is about 15x15 arc minutes. ...
Photon Dominated Regions
... ii. In the PDRs occurs the interchange of energy between massive stars and the interstellar medium iii. The comprehension of the physical and chemical processed occuring in PDRs are necessary to evolution of molecular clouds, and eventually of the galaxies iv. Key objects such as protoplanetary disk ...
... ii. In the PDRs occurs the interchange of energy between massive stars and the interstellar medium iii. The comprehension of the physical and chemical processed occuring in PDRs are necessary to evolution of molecular clouds, and eventually of the galaxies iv. Key objects such as protoplanetary disk ...
File
... The Solar System formed 4.568 billion years ago from the gravitational collapse of a region within a large molecular cloud. This initial cloud was likely several light-years across and probably birthed several stars. As is typical of molecular clouds, this one consisted mostly of hydrogen, with some ...
... The Solar System formed 4.568 billion years ago from the gravitational collapse of a region within a large molecular cloud. This initial cloud was likely several light-years across and probably birthed several stars. As is typical of molecular clouds, this one consisted mostly of hydrogen, with some ...
www.astro.caltech.edu
... While the majority of detected GRBs originate from massive stars, a smaller subset sees to have a completely different physical cause (Figure 2). The host galaxies of short-duration GRBs (those whose gamma-ray emission lasts for 2 seconds or less) observed with Keck have been localized to a complete ...
... While the majority of detected GRBs originate from massive stars, a smaller subset sees to have a completely different physical cause (Figure 2). The host galaxies of short-duration GRBs (those whose gamma-ray emission lasts for 2 seconds or less) observed with Keck have been localized to a complete ...
File
... crust, about a kilometer thick. This crust is very hard and very smooth. Gravity would probably prevent any irregularities larger than half a centimeter. ...
... crust, about a kilometer thick. This crust is very hard and very smooth. Gravity would probably prevent any irregularities larger than half a centimeter. ...
Analyzing Spectra
... 1. What does a set of matching vertical lines indicate? _________________________________________ 2. What are the five known substances in this activity? ________________________________________ Look closely at the spectrum below. Those black lines are caused by elements in the star's atmosphere. As ...
... 1. What does a set of matching vertical lines indicate? _________________________________________ 2. What are the five known substances in this activity? ________________________________________ Look closely at the spectrum below. Those black lines are caused by elements in the star's atmosphere. As ...
30galaxies and the universe
... Black holes in the centers of giant galaxies—some more than one billion solar masses—had enough infalling gas to once blaze as quasars. The final mass of a black hole is not primordial, but instead is determined during the galaxy formation process. This shows that there is a close relationship betwe ...
... Black holes in the centers of giant galaxies—some more than one billion solar masses—had enough infalling gas to once blaze as quasars. The final mass of a black hole is not primordial, but instead is determined during the galaxy formation process. This shows that there is a close relationship betwe ...
The Stars
... M is the magnitude you would see at a distance of 10 parsecs (32.6 light years) M = 4.8 Distance modulus (DM): a measure of distance DM = m - M = 5 log(d) -5 ...
... M is the magnitude you would see at a distance of 10 parsecs (32.6 light years) M = 4.8 Distance modulus (DM): a measure of distance DM = m - M = 5 log(d) -5 ...
Supernova worksheet with solutions ()
... certain mass, it begins to collapse in on itself. As it collapses, it heats up. The collapse continues until the center of the cloud is hot enough to fuse hydrogen into helium. Energy Source: Gravitational energy ...
... certain mass, it begins to collapse in on itself. As it collapses, it heats up. The collapse continues until the center of the cloud is hot enough to fuse hydrogen into helium. Energy Source: Gravitational energy ...
Shocking Truth about Massive Stars Lidia Oskinova Chandra’s First Decade of Discovery
... attributed only to the wind opacity (Oskinova et al. ’06) X−ray spectra of single WN stars are harder than spectra of O−stars (Ignace et al. 2003) Single WC stars are X−ray quiet (Oskinova et al. 2003) X−ray bright WR stars are binaries (Oskinova & Hamann ...
... attributed only to the wind opacity (Oskinova et al. ’06) X−ray spectra of single WN stars are harder than spectra of O−stars (Ignace et al. 2003) Single WC stars are X−ray quiet (Oskinova et al. 2003) X−ray bright WR stars are binaries (Oskinova & Hamann ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.