A billion pixels, a billion stars
... away from their origins. During this spatial diffusion, their velocities remained clustered. Hence, if we know their distances and velocities very precisely, we can in effect “turn the clock back” and determine how the diffusion process happened. Many stars in the disc – Gaia will tell us how many – ...
... away from their origins. During this spatial diffusion, their velocities remained clustered. Hence, if we know their distances and velocities very precisely, we can in effect “turn the clock back” and determine how the diffusion process happened. Many stars in the disc – Gaia will tell us how many – ...
A Search for New Solar-Type Post-T Tauri Stars in
... substantial portion of the sky known to contain very young (<80 Myr) stellar populations. Census information for stars in the 3-80 Myr age range is woefully incomplete. This is unfortunate since it is exactly the critical time scale for following and developing our understanding of the evolution of ...
... substantial portion of the sky known to contain very young (<80 Myr) stellar populations. Census information for stars in the 3-80 Myr age range is woefully incomplete. This is unfortunate since it is exactly the critical time scale for following and developing our understanding of the evolution of ...
EF Eri: Its White Dwarf Primary and L Dwarf Secondary
... --> Polar or AM Herculis type. These contain no accretion disk. ...
... --> Polar or AM Herculis type. These contain no accretion disk. ...
PH607 – Galaxies
... the Universe. An observer with a large motion with respect to the Hubble flow would measure blueshifts in front and large redshifts behind, instead of the same redshifts proportional to distance in all directions (Universe is isotropic). Thus we can measure our motion relative to the Hubble flow, wh ...
... the Universe. An observer with a large motion with respect to the Hubble flow would measure blueshifts in front and large redshifts behind, instead of the same redshifts proportional to distance in all directions (Universe is isotropic). Thus we can measure our motion relative to the Hubble flow, wh ...
Stars in Their Youth
... Energy Generation in the Main Sequence As mentioned above, the most distinguishing feature of the stars on the main sequence is that they are converting hydrogen into helium in their cores. In the Chap. 1 we outlined the extraordinary conjecture by Eddington. But it took nearly twenty years to work ...
... Energy Generation in the Main Sequence As mentioned above, the most distinguishing feature of the stars on the main sequence is that they are converting hydrogen into helium in their cores. In the Chap. 1 we outlined the extraordinary conjecture by Eddington. But it took nearly twenty years to work ...
The Milky Way Galaxy (ch. 23)
... the person who compiled the list). Still others retain more descriptive names, like “The Sombrero,” or “The Mice.” You don’t have to memorize any galaxy names for the exam The nearest large disk galaxy like ours is The Andromeda Galaxy, M31 These two views are M31 in two different wavelength bands, ...
... the person who compiled the list). Still others retain more descriptive names, like “The Sombrero,” or “The Mice.” You don’t have to memorize any galaxy names for the exam The nearest large disk galaxy like ours is The Andromeda Galaxy, M31 These two views are M31 in two different wavelength bands, ...
10 Stellar Evolution - Journigan-wiki
... Do more stars form in isolation or in groups? Why? What is infall? Why is infall important to protostars? When kinetic energy is transferred to a supercompacted gas, it turns into what? 5. You see a planetary nebula through a telescope. What do you know about it and its history? 6. You see a red gia ...
... Do more stars form in isolation or in groups? Why? What is infall? Why is infall important to protostars? When kinetic energy is transferred to a supercompacted gas, it turns into what? 5. You see a planetary nebula through a telescope. What do you know about it and its history? 6. You see a red gia ...
Today in Astronomy 102: electron degeneracy pressure and white
... q The more massive the degenerate star, the closer the electron speeds get to the speed of light. q The closer the speeds get to c, the harder it is to accelerate the electrons further. q Thus, the electron degeneracy pressure doesn’t keep increasing as much with tighter confinement: the electrons r ...
... q The more massive the degenerate star, the closer the electron speeds get to the speed of light. q The closer the speeds get to c, the harder it is to accelerate the electrons further. q Thus, the electron degeneracy pressure doesn’t keep increasing as much with tighter confinement: the electrons r ...
The Stars education kit - Student activities 11-20
... Lying between the Southern Cross and the False Cross is the most luminous and massive star in our Milky Way Galaxy – Eta Carinae. It radiates five million times more brightly than the Sun and is about 120 times more massive. It sheds about two Earth masses each day in its stellar wind. If the Sun ga ...
... Lying between the Southern Cross and the False Cross is the most luminous and massive star in our Milky Way Galaxy – Eta Carinae. It radiates five million times more brightly than the Sun and is about 120 times more massive. It sheds about two Earth masses each day in its stellar wind. If the Sun ga ...
Chapter 16 - Astronomy
... nucleus, it wasn’t until the development of IR/radio and X-ray/gamma-ray astronomy that we could “look” at the Galactic nucleus. 3. The observed number density of stars increases as we get closer to the Galactic center, down to about 2 pc from the center. For distances closer than 2 pc, observations ...
... nucleus, it wasn’t until the development of IR/radio and X-ray/gamma-ray astronomy that we could “look” at the Galactic nucleus. 3. The observed number density of stars increases as we get closer to the Galactic center, down to about 2 pc from the center. For distances closer than 2 pc, observations ...
First Stars II
... The accretion rate is related to density distribution (the temperature in prestellar clumps): ...
... The accretion rate is related to density distribution (the temperature in prestellar clumps): ...
main characteristics of the emission from elliptical galaxies
... primarly due to a halo of extremely hot gas in which ellipticals seem to be embedded. After a brief classi cation, the two main processes linked to these phenomena will be described, together with the informations we can collect thanks to them. Eventually, we will take a quick look at the other regi ...
... primarly due to a halo of extremely hot gas in which ellipticals seem to be embedded. After a brief classi cation, the two main processes linked to these phenomena will be described, together with the informations we can collect thanks to them. Eventually, we will take a quick look at the other regi ...
January
... against its magnitude. For nearby stars we can create a standard CM diagram of color against absolute magnitude – a measure of the stars real brightness. For clusters of stars, whose stars are at about the same distance, astronomers can compare the cluster CM diagram against the standard CM diagram ...
... against its magnitude. For nearby stars we can create a standard CM diagram of color against absolute magnitude – a measure of the stars real brightness. For clusters of stars, whose stars are at about the same distance, astronomers can compare the cluster CM diagram against the standard CM diagram ...
Part I: Shining a Light on Visual Magnitude
... the sky, the brightness of the objects it’s looking at is called apparent magnitude. If we’re only considering what the human eye can see, then we’re measuring visual magnitude. This is a relative measurement on a log scale. It’s a ratio of the irradiance (which is the energy of the source over a gi ...
... the sky, the brightness of the objects it’s looking at is called apparent magnitude. If we’re only considering what the human eye can see, then we’re measuring visual magnitude. This is a relative measurement on a log scale. It’s a ratio of the irradiance (which is the energy of the source over a gi ...
Globular Clusters
... CLUSTER SYSTEMS IN NORMAL GALAXIES). There are, however, important differences. While all the globulars in our Galaxy and in M31 are old (ages of about 10 Gyr, at least), there are galaxies, such as the two Magellanic Clouds and M33 (the Triangulum Galaxy), hosting much younger GCs (ages of a few Gy ...
... CLUSTER SYSTEMS IN NORMAL GALAXIES). There are, however, important differences. While all the globulars in our Galaxy and in M31 are old (ages of about 10 Gyr, at least), there are galaxies, such as the two Magellanic Clouds and M33 (the Triangulum Galaxy), hosting much younger GCs (ages of a few Gy ...
The Wise Centaur - Interactive Stars
... For the ancient Greeks, therefore, who inherited this vision of a living sphere, and who gave many of the constellations the names and forms which they still have today, it seemed quite natural to believe that Orion and The Wise Centaur, Perseus, the glittering hero, and the Lyre of Orpheus, the leg ...
... For the ancient Greeks, therefore, who inherited this vision of a living sphere, and who gave many of the constellations the names and forms which they still have today, it seemed quite natural to believe that Orion and The Wise Centaur, Perseus, the glittering hero, and the Lyre of Orpheus, the leg ...
Lecture - Ann Arbor Earth Science
... area of the sky near Ursa Major for 10 days. It produced this picture. Almost all the objects in this photograph are galaxies that are located between 5 and 10 billion light years away from Earth. Younger galaxies are blue while older galaxies are red in color. ...
... area of the sky near Ursa Major for 10 days. It produced this picture. Almost all the objects in this photograph are galaxies that are located between 5 and 10 billion light years away from Earth. Younger galaxies are blue while older galaxies are red in color. ...
poster
... The YSOVAR project (Morales-Calderon et al. 2011, Rebull et al. in prep) monitored a dozen star forming regions in 3.6 m and 4.5m using the warm mission capabilities of Spitzer. The sampling varies with the region, but most star forming regions were observed 50-100 times, on scales of hours to mon ...
... The YSOVAR project (Morales-Calderon et al. 2011, Rebull et al. in prep) monitored a dozen star forming regions in 3.6 m and 4.5m using the warm mission capabilities of Spitzer. The sampling varies with the region, but most star forming regions were observed 50-100 times, on scales of hours to mon ...
OUR SOLAR SYSTEM
... our universe is. To give a sense of its vast scale, we’ve devoted the bottom of this and the next four stories to a linear scale of the cosmos. The distance to each object represents the amount of space its light has traversed to reach Earth. Because the universe is expanding, a distant body will ha ...
... our universe is. To give a sense of its vast scale, we’ve devoted the bottom of this and the next four stories to a linear scale of the cosmos. The distance to each object represents the amount of space its light has traversed to reach Earth. Because the universe is expanding, a distant body will ha ...
Unpublished draft available in format
... solution; e.g. the Earth as a planet belongs to the solar system which belongs to the galaxy which belongs to the local group (of galaxies in a galactic group). But this does not tell us the citation order between, say, several different arrays of stars (by stage - novae, dwarfs, etc.; by spectral t ...
... solution; e.g. the Earth as a planet belongs to the solar system which belongs to the galaxy which belongs to the local group (of galaxies in a galactic group). But this does not tell us the citation order between, say, several different arrays of stars (by stage - novae, dwarfs, etc.; by spectral t ...
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.