Star Clusters - Caltech Astronomy
... mass of some of the younger clusters exceeds 104 M . Few if any open clusters have enough members to be characterized in terms of dynamically meaningful quantities, such as the core radius or tidal radius. Instead, open cluster sizes are based on the ‘angular diameter’ measurement where the diamete ...
... mass of some of the younger clusters exceeds 104 M . Few if any open clusters have enough members to be characterized in terms of dynamically meaningful quantities, such as the core radius or tidal radius. Instead, open cluster sizes are based on the ‘angular diameter’ measurement where the diamete ...
Warm-Up Monday, July 23, 2012
... • A. The stars of Orion are closer together in space. • B. The stars in Orion orbit the Sun, just like the planets. • C. The brightest stars in Orion are the ones that are closest to us. • D. You can’t tell if the brightest stars in Orion are really brighter than the others, or if they are just clos ...
... • A. The stars of Orion are closer together in space. • B. The stars in Orion orbit the Sun, just like the planets. • C. The brightest stars in Orion are the ones that are closest to us. • D. You can’t tell if the brightest stars in Orion are really brighter than the others, or if they are just clos ...
HD 140283: A Star in the Solar Neighborhood that Formed Shortly
... spectrograph at Cerro Tololo Interamerican Observatory (CTIO). The classifications were then accomplished through comparison with a network of standards obtained with the same telescopes, assisted by equivalent-width measurements of lines sensitive to temperature and luminosity. Photometry of the re ...
... spectrograph at Cerro Tololo Interamerican Observatory (CTIO). The classifications were then accomplished through comparison with a network of standards obtained with the same telescopes, assisted by equivalent-width measurements of lines sensitive to temperature and luminosity. Photometry of the re ...
Star-S_Teacher_Guide - The University of Texas at Dallas
... o If your students have already done the Scale Model Solar System Activity, discuss the usefulness of the scale factor. Ask your students what the advantage would be of modeling stars on the same scale. By using the same scale factor of 1:10 billion, the students will more easily be able to make com ...
... o If your students have already done the Scale Model Solar System Activity, discuss the usefulness of the scale factor. Ask your students what the advantage would be of modeling stars on the same scale. By using the same scale factor of 1:10 billion, the students will more easily be able to make com ...
Galaxies (and stars) in the far infrared: results from the AKARI All
... a smaller branch overlapping galaxies contains few bright stars with known IR excess (due to, e.g. dusty disks) – most notable among them is Vega, some faint (poorly known) stars and a certain number of planetary nebulae ...
... a smaller branch overlapping galaxies contains few bright stars with known IR excess (due to, e.g. dusty disks) – most notable among them is Vega, some faint (poorly known) stars and a certain number of planetary nebulae ...
Astronomy 112: The Physics of Stars Class 1 Notes: Observing Stars
... nearest star to us is Proxima Centauri, which has a parallax of 0.88” – to put this in perspective, this corresponds to the size of a quarter at a distance of half a kilometer. As a result of this difficulty, the first successful use of parallax to measure the distance to a star outside the solar sy ...
... nearest star to us is Proxima Centauri, which has a parallax of 0.88” – to put this in perspective, this corresponds to the size of a quarter at a distance of half a kilometer. As a result of this difficulty, the first successful use of parallax to measure the distance to a star outside the solar sy ...
Fulltext PDF - Indian Academy of Sciences
... a simple dynamical model. This model is introduced and described in this article. It can serve as an excellent exercise in an undergraduate physics course, illustrating both mechanical principles and basic astronomy. Introduction Today, a great deal is known about the collection of stars of which ou ...
... a simple dynamical model. This model is introduced and described in this article. It can serve as an excellent exercise in an undergraduate physics course, illustrating both mechanical principles and basic astronomy. Introduction Today, a great deal is known about the collection of stars of which ou ...
ASTRONOMY 113 Laboratory Lab 5: Spectral Classification of the
... Some of the most beautiful objects in the sky are star clusters, groups of stars ranging in number from a few hundreds of stars ("open clusters") to a few million stars ("globular star clusters"). All of the stars in these clusters are bound to each other by gravity. Star clusters are also valuable ...
... Some of the most beautiful objects in the sky are star clusters, groups of stars ranging in number from a few hundreds of stars ("open clusters") to a few million stars ("globular star clusters"). All of the stars in these clusters are bound to each other by gravity. Star clusters are also valuable ...
Zodiac Party Game - Home - DMNS Galaxy Guide Portal
... the rate of about one degree per day. (In fact, it was this motion that caused the Babylonians to choose 360 degrees for a circle.) The second motion of the CELESTIAL SPHERE is its yearly orbit around the sky. For the Earth to travel once around the Sun and return to the place where a particular sta ...
... the rate of about one degree per day. (In fact, it was this motion that caused the Babylonians to choose 360 degrees for a circle.) The second motion of the CELESTIAL SPHERE is its yearly orbit around the sky. For the Earth to travel once around the Sun and return to the place where a particular sta ...
Second Semester Study Guide
... 25. What conclusion can be drawn from the fact that some planets with solid surfaces and satellites have impact craters? A. Collisions between Solar System bodies and planetesimals were common at one time. B. The young planets had softer surfaces. C. Volcanoes were very active in the early stages of ...
... 25. What conclusion can be drawn from the fact that some planets with solid surfaces and satellites have impact craters? A. Collisions between Solar System bodies and planetesimals were common at one time. B. The young planets had softer surfaces. C. Volcanoes were very active in the early stages of ...
Astrophysics Questions (DRAFT)
... amplitude (strain) h observed here on Earth? Would LIGO be able to detect it? 62. Approximately how many binary systems in the Galaxy are thought to contain a black hole? What is the evidence for this? 63. How does the orbital frequency of the innermost stable orbit around a black hole scale with it ...
... amplitude (strain) h observed here on Earth? Would LIGO be able to detect it? 62. Approximately how many binary systems in the Galaxy are thought to contain a black hole? What is the evidence for this? 63. How does the orbital frequency of the innermost stable orbit around a black hole scale with it ...
So, what`s the problem for high
... emission was made by physicists who built IR detectors and put them on telescopes. The first important far-ir source was the Galactic Center, discovered by a one-inch telescope on a high altitude balloon. It’s luminosity comes largely from formation of high-mass stars. The Infrared Astronomy Satelli ...
... emission was made by physicists who built IR detectors and put them on telescopes. The first important far-ir source was the Galactic Center, discovered by a one-inch telescope on a high altitude balloon. It’s luminosity comes largely from formation of high-mass stars. The Infrared Astronomy Satelli ...
81 KB - CSIRO Publishing
... interactions (mergers, tidal stripping, etc.) can change the nature of an object over time. The criteria listed above apply to objects today and not their past or future state. Below we briefly mention some special cases of stellar systems which challenge attempts to define a galaxy. 4 Special Cases ...
... interactions (mergers, tidal stripping, etc.) can change the nature of an object over time. The criteria listed above apply to objects today and not their past or future state. Below we briefly mention some special cases of stellar systems which challenge attempts to define a galaxy. 4 Special Cases ...
How we found about BLACK HOLES
... White dwarfs are now thought to be quite common. Astronomers think that one star out of every 40 is a white dwarf: White dwarfs are so small and dim, however, that we can only see those few that are nearest to us. Although Sirius B is so small, it still has a mass equal to that of our Sun, or it wou ...
... White dwarfs are now thought to be quite common. Astronomers think that one star out of every 40 is a white dwarf: White dwarfs are so small and dim, however, that we can only see those few that are nearest to us. Although Sirius B is so small, it still has a mass equal to that of our Sun, or it wou ...
2.3 Peculiar galaxies
... Black hole accretion discs. If the available gas simply fell radially downwards towards the black hole, the energy it would gain would be kinetic energy, and it wouldn’t give much radiation; it would just disappear down the black hole. However, if, as is very likely, the gas is rotating around the b ...
... Black hole accretion discs. If the available gas simply fell radially downwards towards the black hole, the energy it would gain would be kinetic energy, and it wouldn’t give much radiation; it would just disappear down the black hole. However, if, as is very likely, the gas is rotating around the b ...
The Milky Way thin disk structure as revealed by stars and young
... when seen face-off, possess dusty and gaseous disks where stars are barely visible. On the other hand, when seen face-on, they exhibit quite spectacular structures in the form of gaseous and stellar spiral arms, bridges, inter-arm structures, knots, bifurcations, and so forth. These detailed shapes a ...
... when seen face-off, possess dusty and gaseous disks where stars are barely visible. On the other hand, when seen face-on, they exhibit quite spectacular structures in the form of gaseous and stellar spiral arms, bridges, inter-arm structures, knots, bifurcations, and so forth. These detailed shapes a ...
Astronomical Formulae
... Where D is the diameter of the objective in inches Atmospheric conditions seldom permit Theta > 0.5". The Dawes Limit is one half the angular diameter of the Airy (diffraction) disc, so that the edge of one disc does not extend beyond the center of the other). The working value is two times the Dawe ...
... Where D is the diameter of the objective in inches Atmospheric conditions seldom permit Theta > 0.5". The Dawes Limit is one half the angular diameter of the Airy (diffraction) disc, so that the edge of one disc does not extend beyond the center of the other). The working value is two times the Dawe ...
The Milky Way - Houston Community College System
... Some neutron stars have magnetic fields ~ 100 times stronger even than normal neutron stars. These care called Magnetars. ...
... Some neutron stars have magnetic fields ~ 100 times stronger even than normal neutron stars. These care called Magnetars. ...
Neutron Star
... Some neutron stars have magnetic fields ~ 1000 times stronger even than normal neutron stars. These care called Magnetars. ...
... Some neutron stars have magnetic fields ~ 1000 times stronger even than normal neutron stars. These care called Magnetars. ...
PHYS3380_102815_bw - The University of Texas at Dallas
... XZ Tauri - young system with two stars orbiting each other - separated by about 6 billion kilometers (about the distance from the Sun to Pluto) - shows bubble of hot, glowing gas extending nearly 96 billion kilometers from this young star system. - appears much broader than the narrow jets seen in o ...
... XZ Tauri - young system with two stars orbiting each other - separated by about 6 billion kilometers (about the distance from the Sun to Pluto) - shows bubble of hot, glowing gas extending nearly 96 billion kilometers from this young star system. - appears much broader than the narrow jets seen in o ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.