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Astronomy 360 Physics/Geology 360
... The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years. Dust that forms a faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the alternate name Maia Nebula ...
... The cluster is dominated by hot blue and extremely luminous stars that have formed within the last 100 million years. Dust that forms a faint reflection nebulosity around the brightest stars was thought at first to be left over from the formation of the cluster (hence the alternate name Maia Nebula ...
Document
... a. Always has the same luminosity. b. Has some means of knowing its luminosity without first needing to know its distance. c. Can vary in brightness (as long as it always has the same average luminosity). d. Has a known absolute magnitude. e. Always gives off the same amount of energy, regardless of ...
... a. Always has the same luminosity. b. Has some means of knowing its luminosity without first needing to know its distance. c. Can vary in brightness (as long as it always has the same average luminosity). d. Has a known absolute magnitude. e. Always gives off the same amount of energy, regardless of ...
Document
... • What causes the mass to keep on increasing? • Don’t see anything there. Thus “dark” matter. ...
... • What causes the mass to keep on increasing? • Don’t see anything there. Thus “dark” matter. ...
Milky Way
... • What causes the mass to keep on increasing? • Don’t see anything there. Thus “dark” matter. ...
... • What causes the mass to keep on increasing? • Don’t see anything there. Thus “dark” matter. ...
distance to the centre of the Milky Way.
... Long-exposure photographs show many more stars (fainter than just the eye + telescope can see). This yields better statistical results. ...
... Long-exposure photographs show many more stars (fainter than just the eye + telescope can see). This yields better statistical results. ...
Hypervelocity Globular: A beacon of merging clusters Oleg Gnedin with Alexey Vikhlinin
... requires different acceleration mechanism • Likely belongs to the globular cluster system of M86 group, which is merging head-on with the Virgo cluster: significant probability of reaching the observed velocity • Extreme negative velocity outliers are signposts of cluster ...
... requires different acceleration mechanism • Likely belongs to the globular cluster system of M86 group, which is merging head-on with the Virgo cluster: significant probability of reaching the observed velocity • Extreme negative velocity outliers are signposts of cluster ...
STAR FORMATION (Ch. 19) The basics: GRAVITY vs. PRESSURE
... we’ll return to this). Make sure you understand the H-R diagrams in Figs. 19.1819.19. Can you explain what determines the lifetime of a star clusters? Why do open clusters survive (on average) for a much shorter time than globular clusters? (This is actually a fairly complicated question, but a good ...
... we’ll return to this). Make sure you understand the H-R diagrams in Figs. 19.1819.19. Can you explain what determines the lifetime of a star clusters? Why do open clusters survive (on average) for a much shorter time than globular clusters? (This is actually a fairly complicated question, but a good ...
The Milky Way – A Classic Galaxy
... schmushed it all together into what is now the central bulge. • Then, more slowly, gas fell in from farther out, had angular momentum, and so settled into a flat disk, and only gradually is forming itself into stars. • Globular clusters formed during the proto-galaxy stage and during the time they c ...
... schmushed it all together into what is now the central bulge. • Then, more slowly, gas fell in from farther out, had angular momentum, and so settled into a flat disk, and only gradually is forming itself into stars. • Globular clusters formed during the proto-galaxy stage and during the time they c ...
here.
... - A group of gravitationally bound stars formed out of the same cloud, at the same time, and at the same distance from us. - They are ideal laboratories to study stellar evolution, and to probe the Galactic formation and evolutionary history ...
... - A group of gravitationally bound stars formed out of the same cloud, at the same time, and at the same distance from us. - They are ideal laboratories to study stellar evolution, and to probe the Galactic formation and evolutionary history ...
Photometric analysis of the globular cluster NGC5466
... Star clusters are collections of stars kept together by their gravitational force. We can distinguish between open clusters and globular clusters. Open clusters do not have a regular shape and have from few tens to 103 stars, losely bound to each others, which are spread in a very large space; there ...
... Star clusters are collections of stars kept together by their gravitational force. We can distinguish between open clusters and globular clusters. Open clusters do not have a regular shape and have from few tens to 103 stars, losely bound to each others, which are spread in a very large space; there ...
Globular Clusters
... What is a globular cluster? How do stars evolve? Observing Filters, tri-color image Age of and Distance to M13 Age of the Universe ...
... What is a globular cluster? How do stars evolve? Observing Filters, tri-color image Age of and Distance to M13 Age of the Universe ...
September Globular Clusters - Salisbury Plain Observing Group
... seek some of these celestial long term denizens this autumn, and get out under the night sky. ...
... seek some of these celestial long term denizens this autumn, and get out under the night sky. ...
Star clusters and constellations
... The three photographs show M13, the Pleiades and part of the constellation of Orion. The following diagrams show how the constellation appears from the Earth and then a ‘side view’ from a point far out in space showing how the stars are spread out at different distances. Betelgeuse lies at only 310 ...
... The three photographs show M13, the Pleiades and part of the constellation of Orion. The following diagrams show how the constellation appears from the Earth and then a ‘side view’ from a point far out in space showing how the stars are spread out at different distances. Betelgeuse lies at only 310 ...
Part 2 Answer Key
... Star Clusters are multiple star systems bound together by the force of gravity. Star Clusters can be divided into two main groups. One group is called Globular Clusters. They contain many stars and gravity holds them tightly together. They swarm just outside the galaxy and form a halo or bulge. We k ...
... Star Clusters are multiple star systems bound together by the force of gravity. Star Clusters can be divided into two main groups. One group is called Globular Clusters. They contain many stars and gravity holds them tightly together. They swarm just outside the galaxy and form a halo or bulge. We k ...
lecture23
... All stars in a cluster are at about same distance from Earth. All stars in a cluster are of about the same age. Clusters therefore are natural laboratory in which mass, rather than age, of stars is only significant variable. ...
... All stars in a cluster are at about same distance from Earth. All stars in a cluster are of about the same age. Clusters therefore are natural laboratory in which mass, rather than age, of stars is only significant variable. ...
PowerPoint File
... Measure the distance over which the density of stars significantly falls off with height above, or distance below, the galactic plane. The distance depends on the type of objects considered, but is roughly 100 – 200 parsecs. The galactic plane is much thinner than it is wide. ...
... Measure the distance over which the density of stars significantly falls off with height above, or distance below, the galactic plane. The distance depends on the type of objects considered, but is roughly 100 – 200 parsecs. The galactic plane is much thinner than it is wide. ...
astrocoursespring2012lec4
... have the highest absolute magnitude, and these will be the first to evolve into the giant star stage. As the cluster ages, stars of successively lower masses will also enter the giant star stage. Thus the age of a single population cluster can be measured by looking for the stars that are just begin ...
... have the highest absolute magnitude, and these will be the first to evolve into the giant star stage. As the cluster ages, stars of successively lower masses will also enter the giant star stage. Thus the age of a single population cluster can be measured by looking for the stars that are just begin ...
The Milky Way – A Classic Galaxy
... • Could see the brightest individual stars. Among them, variables of the right color and light variation to show them as Cepheids • Therefore, this was not a nearby nebula around a new star, it was an entire galaxy. • Herschel’s map then could be seen as a map of our own Milky Way Galaxy ...
... • Could see the brightest individual stars. Among them, variables of the right color and light variation to show them as Cepheids • Therefore, this was not a nearby nebula around a new star, it was an entire galaxy. • Herschel’s map then could be seen as a map of our own Milky Way Galaxy ...
Milky Way
... would have sitting inside a disk of stars. – Consistent with the Sun towards an edge ...
... would have sitting inside a disk of stars. – Consistent with the Sun towards an edge ...
Review Quiz No. 22
... belongs to the solar system. belongs to the Milky Way. is located as distances of less than 100 pc from us. is located in galaxies other than the Milky Way. does not belong to a particular galaxy at all. ...
... belongs to the solar system. belongs to the Milky Way. is located as distances of less than 100 pc from us. is located in galaxies other than the Milky Way. does not belong to a particular galaxy at all. ...
Globular Cluster in Canes Venatici
... stars within each cubic light year) than in the Sun’s neighborhood. If the earth orbitted a star located in a globular cluster, the next nearest star would be light months away rather than light years. ...
... stars within each cubic light year) than in the Sun’s neighborhood. If the earth orbitted a star located in a globular cluster, the next nearest star would be light months away rather than light years. ...
Globular cluster
![](https://en.wikipedia.org/wiki/Special:FilePath/A_Swarm_of_Ancient_Stars_-_GPN-2000-000930.jpg?width=300)
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.