a description of planets and stars you may see
... discovered Uranus by telescope in 1781, expanding the Solar System for the first time in modern history. Uranus has a ring system, numerous moons, and has its axis of rotation tilted sideways. The Moon, our natural satellite, always shows us the same face. Its cycle of phases have been an important ...
... discovered Uranus by telescope in 1781, expanding the Solar System for the first time in modern history. Uranus has a ring system, numerous moons, and has its axis of rotation tilted sideways. The Moon, our natural satellite, always shows us the same face. Its cycle of phases have been an important ...
doc
... begins it’s main sequence stage of evolution, going into some detail. Note that the statements made about stellar evolution are almost entirely theoretical, but form one of the best-established and tested parts of astronomy—stars are not so complex that we can’t make models for them (compare with bi ...
... begins it’s main sequence stage of evolution, going into some detail. Note that the statements made about stellar evolution are almost entirely theoretical, but form one of the best-established and tested parts of astronomy—stars are not so complex that we can’t make models for them (compare with bi ...
Lecture 18
... Hawking derived that the temperature of a black hole is thermal. Energy for the radiation comes from the mass of the hole. The black hole shrinks with time. ...
... Hawking derived that the temperature of a black hole is thermal. Energy for the radiation comes from the mass of the hole. The black hole shrinks with time. ...
Last time: Star Clusters (sec. 19.6)
... 20-2.) The star is also pulsating (period ~years). Eventually so much of the envelope is lost that the last bit of envelope gets ejected as a more or less spherical shell of gas called a planetary nebula. (see pretty images, pp. 526527) (Note: “planetary” has nothing to do with planets; just a histo ...
... 20-2.) The star is also pulsating (period ~years). Eventually so much of the envelope is lost that the last bit of envelope gets ejected as a more or less spherical shell of gas called a planetary nebula. (see pretty images, pp. 526527) (Note: “planetary” has nothing to do with planets; just a histo ...
Mass Segregation in Globular Clusters
... Because the light in the telescopic image of a star is spread over several adjacent pixels, we exercised extreme care and control to ensure positional accuracy. By carefully selecting the ACS filter through which the observations were made, the two target groups of stars with very different masses ...
... Because the light in the telescopic image of a star is spread over several adjacent pixels, we exercised extreme care and control to ensure positional accuracy. By carefully selecting the ACS filter through which the observations were made, the two target groups of stars with very different masses ...
Slide 1 - Typepad
... lighting (referred to as "light pollution"), this scale describes what is shown when you query ECU about Magnitudes: ...
... lighting (referred to as "light pollution"), this scale describes what is shown when you query ECU about Magnitudes: ...
8 clusters stellar evo
... versus initial stellar mass Large stars live and die very quickly! 200 billion years! ...
... versus initial stellar mass Large stars live and die very quickly! 200 billion years! ...
The Milky Way * A Classic Galaxy
... • She studied the Large Magellanic Cloud – what looked like a super star cluster of millions or billions of stars • Found stars with the right color and light curves to be classified as Cepheids • Like, Delta Cephei, Eta Aquilae, and other ...
... • She studied the Large Magellanic Cloud – what looked like a super star cluster of millions or billions of stars • Found stars with the right color and light curves to be classified as Cepheids • Like, Delta Cephei, Eta Aquilae, and other ...
Omega Centauri
... general) stellar populations with new eyes. De facto, a new era on globular cluster research is started: 1) Many serious problems remain unsolved, and we still have a rather incoherent picture. The new WFC3/HST will play a major role. But also multi-object spectroscopy is mandatory to compose the pu ...
... general) stellar populations with new eyes. De facto, a new era on globular cluster research is started: 1) Many serious problems remain unsolved, and we still have a rather incoherent picture. The new WFC3/HST will play a major role. But also multi-object spectroscopy is mandatory to compose the pu ...
Integrative Studies 410 Our Place in the Universe
... • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
... • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
every star in the cluster.
... This is just one relatively brief stage on the way to stellar demise. The globular cluster in the figure just above has a lot of red giants, continually forming from evolving stars near the turnoff. But there were originally many stars that were even more massive, that became red giants for a time, ...
... This is just one relatively brief stage on the way to stellar demise. The globular cluster in the figure just above has a lot of red giants, continually forming from evolving stars near the turnoff. But there were originally many stars that were even more massive, that became red giants for a time, ...
Unit 1
... experience a gravitational redshift. – Their frequency will be shifted toward the red end of the spectrum ...
... experience a gravitational redshift. – Their frequency will be shifted toward the red end of the spectrum ...
Galaxy clusters - University of Iowa Astrophysics
... source, we can figure out the total mass in the lens. This provides an independent confirmation of dark matter. • A lense can act as a huge telescope. The deepest images of the most distant galaxies are obtained with clusters acting as gravitational lenses. ...
... source, we can figure out the total mass in the lens. This provides an independent confirmation of dark matter. • A lense can act as a huge telescope. The deepest images of the most distant galaxies are obtained with clusters acting as gravitational lenses. ...
Cluster and Association Members
... are physically related groups of stars held together by mutual gravitational attraction. Therefore, they populate a limited region of space, which is typically much smaller than their distance from the Sun, so that the members are all approximately at the same distance. They are believed to originat ...
... are physically related groups of stars held together by mutual gravitational attraction. Therefore, they populate a limited region of space, which is typically much smaller than their distance from the Sun, so that the members are all approximately at the same distance. They are believed to originat ...
Galaxy clusters - University of Iowa Astrophysics
... source, we can figure out the total mass in the lens. This provides an independent confirmation of dark matter. • A lense can act as a huge telescope. The deepest images of the most distant galaxies are obtained with clusters acting as gravitational lenses. ...
... source, we can figure out the total mass in the lens. This provides an independent confirmation of dark matter. • A lense can act as a huge telescope. The deepest images of the most distant galaxies are obtained with clusters acting as gravitational lenses. ...
observingopenclusters-2-2-1
... Are they all at the same distance? Do they contain the same kinds of stars? ...
... Are they all at the same distance? Do they contain the same kinds of stars? ...
Globular Clusters Dynamic Lives The
... or so globulars surviving today are probably just a small fraction of those that once populated the galactic halo. Tidal shocks can also accelerate the evolution of clusters toward core collapse. Whether a cluster will evaporate before it has a chance to undergo collapse depends on its initial mass ...
... or so globulars surviving today are probably just a small fraction of those that once populated the galactic halo. Tidal shocks can also accelerate the evolution of clusters toward core collapse. Whether a cluster will evaporate before it has a chance to undergo collapse depends on its initial mass ...
The IC 348 surface density in the Perseus molecular cloud L. Cambrésy Observatoire de Strasbourg, France
... the cluster morphology cluster morphology ...
... the cluster morphology cluster morphology ...
Slide 1
... We calculated the age to be between 12 to 14 billion years old It is 25,000 light years away from Earth ...
... We calculated the age to be between 12 to 14 billion years old It is 25,000 light years away from Earth ...
PHY 150
... As Figure 19-19 shows, there are two types of Cepheid variables. Type I Cepheids are metal-rich stars of Population I, while Type II Cepheids are metal-poor stars of Population II. (A) Which type of Cepheid variables would you expect to be found in globular clusters? Which type would you expect to b ...
... As Figure 19-19 shows, there are two types of Cepheid variables. Type I Cepheids are metal-rich stars of Population I, while Type II Cepheids are metal-poor stars of Population II. (A) Which type of Cepheid variables would you expect to be found in globular clusters? Which type would you expect to b ...
The Marathon
... The next object on our list is perhaps the easiest to find. So easy you won't even need a telescope to find it! The Pleiades (M45) is visible as a compact collection of six or seven stars to the naked eye. A simple pair of binoculars will reveal dozens of beautiful blue stars. Next is the first glob ...
... The next object on our list is perhaps the easiest to find. So easy you won't even need a telescope to find it! The Pleiades (M45) is visible as a compact collection of six or seven stars to the naked eye. A simple pair of binoculars will reveal dozens of beautiful blue stars. Next is the first glob ...
Death of Stars
... The PROTON-PROTON reaction and the CNO cycle both involve fusion of four Hydrogen nuclei to form a He nucleus and conversion of mass to energy The energy appears as K.E of the particles formed, high energy gamma rays and neutrinos The temperature of the star’s core determines which process will domi ...
... The PROTON-PROTON reaction and the CNO cycle both involve fusion of four Hydrogen nuclei to form a He nucleus and conversion of mass to energy The energy appears as K.E of the particles formed, high energy gamma rays and neutrinos The temperature of the star’s core determines which process will domi ...
galaxies
... http://hubblesite.org/newscenter/archive/releases/galaxy/irregular/2005/09/results/ 50/ , http://www.noao.edu/image_gallery/html/im0560.html , and http://www.noao.edu/image_gallery/html/im0993.html ...
... http://hubblesite.org/newscenter/archive/releases/galaxy/irregular/2005/09/results/ 50/ , http://www.noao.edu/image_gallery/html/im0560.html , and http://www.noao.edu/image_gallery/html/im0993.html ...
Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is derived from the Latin globulus—a small sphere. A globular cluster is sometimes known more simply as a globular.Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk. Globular clusters are fairly common; there are about 150 to 158 currently known globular clusters in the Milky Way, with perhaps 10 to 20 more still undiscovered. These globular clusters orbit the Galaxy at radii of 40 kiloparsecs (130,000 light-years) or more. Larger galaxies can have more: Andromeda, for instance, may have as many as 500. Some giant elliptical galaxies, particularly those at the centers of galaxy clusters, such as M87, have as many as 13,000 globular clusters.Every galaxy of sufficient mass in the Local Group has an associated group of globular clusters, and almost every large galaxy surveyed has been found to possess a system of globular clusters. The Sagittarius Dwarf galaxy and the disputed Canis Major Dwarf galaxy appear to be in the process of donating their associated globular clusters (such as Palomar 12) to the Milky Way. This demonstrates how many of this galaxy's globular clusters might have been acquired in the past.Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear. It does appear clear that globular clusters are significantly different from dwarf elliptical galaxies and were formed as part of the star formation of the parent galaxy rather than as a separate galaxy. However, recent conjectures by astronomers suggest that globular clusters and dwarf spheroidals may not be clearly separate and distinct types of objects.