III - National Optical Astronomy Observatory
... proposal was selected to receive time (there are always more requests than there is telescope time).They made their observations with the same telescope that you will use when you come to Kitt Peak. This double cluster has been known since antiquity: it is possible to see it without a telescope in a ...
... proposal was selected to receive time (there are always more requests than there is telescope time).They made their observations with the same telescope that you will use when you come to Kitt Peak. This double cluster has been known since antiquity: it is possible to see it without a telescope in a ...
mass per nucleon
... Star Clusters are useful laboratories for studying stars: All the stars in the cluster are at about the same distance from us All the stars in the cluster formed at about the same time (so they are about the same age) the H-R diagram of a cluster represents stars at all stages of their evolution ...
... Star Clusters are useful laboratories for studying stars: All the stars in the cluster are at about the same distance from us All the stars in the cluster formed at about the same time (so they are about the same age) the H-R diagram of a cluster represents stars at all stages of their evolution ...
Problem set 1 1. The binding energy per nucleon for 56Fe is 8.8MeV
... 1. The binding energy per nucleon for 56 Fe is 8.8 MeV per nucleon. Estimate the total energy released per kilogram of matter by the sequence of reactions which fuse hydrogen to iron. 2. The main sequence of the Pleiades cluster of stars consists of stars with mass less than 6M ; the more massive s ...
... 1. The binding energy per nucleon for 56 Fe is 8.8 MeV per nucleon. Estimate the total energy released per kilogram of matter by the sequence of reactions which fuse hydrogen to iron. 2. The main sequence of the Pleiades cluster of stars consists of stars with mass less than 6M ; the more massive s ...
What Can We See in the Night Sky?
... • Groups of stars that are close together and travel together are known as star clusters • Star clusters are part of galaxies • Open clusters – contain about 50 to 1000 stars – dispersed along the Milky Way’s main band ...
... • Groups of stars that are close together and travel together are known as star clusters • Star clusters are part of galaxies • Open clusters – contain about 50 to 1000 stars – dispersed along the Milky Way’s main band ...
Maui Stargazing April Observing List DEEP SPACE OBJECTS
... 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. ZODIACAL LIGHT A faint, roughly triangular, diffu ...
... 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. ZODIACAL LIGHT A faint, roughly triangular, diffu ...
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 ...
Slide 1 - Typepad
... Auriga contains an nteresting variety: many open clusters and nebulous regions simply because the Milky Way runs through it. 3 Open clusters in/out of pentagon of Constellation Auriga south of Capella. M37 the richest cluster containing over 500 stars spread across 20 arcminutes and is the brightest ...
... Auriga contains an nteresting variety: many open clusters and nebulous regions simply because the Milky Way runs through it. 3 Open clusters in/out of pentagon of Constellation Auriga south of Capella. M37 the richest cluster containing over 500 stars spread across 20 arcminutes and is the brightest ...
Day-6
... smaller protogalaxies. Several of these are still orbiting the Milky Way as satellite galaxies. These can contain significant amounts of gas. The gas delivered by the protogalaxies was a significant source of star formation. Evidence for different chemical evolution timescale. ...
... smaller protogalaxies. Several of these are still orbiting the Milky Way as satellite galaxies. These can contain significant amounts of gas. The gas delivered by the protogalaxies was a significant source of star formation. Evidence for different chemical evolution timescale. ...
Goal: To understand clusters of stars
... • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
Goal: To understand clusters of stars
... • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
Review Quiz No. 22
... 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. ...
... 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. ...
The IC 348 surface density in the Perseus molecular cloud L. Cambrésy Observatoire de Strasbourg, France
... Embedded clusters toward the North America Nebula ...
... Embedded clusters toward the North America Nebula ...
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 ...
Was kann man von offenen Sternhaufen lernen?
... Star clusters are physically related groups of stars held together by mutual gravitational attraction. The number of all star clusters in the Milky Way is about 10 000 but only 3000 in catalogues. From these, about 170 Globular Clusters (“old”). ...
... Star clusters are physically related groups of stars held together by mutual gravitational attraction. The number of all star clusters in the Milky Way is about 10 000 but only 3000 in catalogues. From these, about 170 Globular Clusters (“old”). ...
Astronomy Snakes and Ladders Earth, third planet in Solar System
... consist of dust and gas. Usually seen when it is close to the Sun ...
... consist of dust and gas. Usually seen when it is close to the Sun ...
Globular Cluster in Canes Venatici
... is easy to spot in binoculars; a 4-inch scope will resolve the outer portions but it takes an 8-inch scope to resolve the core. One reference notes that M3 is notable for its extensive halo and radiating arms of stars. ...
... is easy to spot in binoculars; a 4-inch scope will resolve the outer portions but it takes an 8-inch scope to resolve the core. One reference notes that M3 is notable for its extensive halo and radiating arms of stars. ...
lecture23
... More luminous variable stars have large Period Variability is EXTREMELY USEFUL, because it is an absolute distance indicator ...
... More luminous variable stars have large Period Variability is EXTREMELY USEFUL, because it is an absolute distance indicator ...
Milky Way
... Nebula Search • William Herschel cataloged over 1000 nebulae. – Many star clusters – Open clusters matched the Milky Way – Globular clusters more uniform in space ...
... Nebula Search • William Herschel cataloged over 1000 nebulae. – Many star clusters – Open clusters matched the Milky Way – Globular clusters more uniform in space ...
Ch. 27.3 Star Groups
... One complete rotation in 200 million years. Our sun is about 30,000 light-years from the center. ...
... One complete rotation in 200 million years. Our sun is about 30,000 light-years from the center. ...
STAR FORMATION (Ch. 19) The basics: GRAVITY vs. PRESSURE
... Very dense clusters, up to 106 stars within ~50 pc size. Most are very distant (~ 1,000 to 100,000 pc), and are not distributed in the disk of the Milky Way ⇒ they form a spherical “halo” around the Milky Way. H-R diagrams: MS includes low mass stars, but NO stars with mass > about 0.8 solar masses ...
... Very dense clusters, up to 106 stars within ~50 pc size. Most are very distant (~ 1,000 to 100,000 pc), and are not distributed in the disk of the Milky Way ⇒ they form a spherical “halo” around the Milky Way. H-R diagrams: MS includes low mass stars, but NO stars with mass > about 0.8 solar masses ...
observingopenclusters-2-2-1
... to the Sun Slide your scope or binoculars parallel to the dog’s back and then move west of that line. You will pick up a large rich field of stars – Open Cluster M41 Procyon (Canis Minor) Locate next large and (also close) Procyon This points the way to 2 very different open clusters in Monocerous, ...
... to the Sun Slide your scope or binoculars parallel to the dog’s back and then move west of that line. You will pick up a large rich field of stars – Open Cluster M41 Procyon (Canis Minor) Locate next large and (also close) Procyon This points the way to 2 very different open clusters in Monocerous, ...
Astronomy 360 Physics/Geology 360
... In astronomy, the Pleiades, or Seven Sisters (Messier object 45), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky. Pleiades has se ...
... In astronomy, the Pleiades, or Seven Sisters (Messier object 45), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky. Pleiades has se ...
Homework 4
... 4. In figures 3.5 and 3.6 (pp. 74 and 75 in the text), the text shows what is called the “main sequence turnoff” for various open clusters (the text does not call it that, but astronomers use the term). How is the “main sequence turnoff” used to determine the age of an open cluster? ...
... 4. In figures 3.5 and 3.6 (pp. 74 and 75 in the text), the text shows what is called the “main sequence turnoff” for various open clusters (the text does not call it that, but astronomers use the term). How is the “main sequence turnoff” used to determine the age of an open cluster? ...
WEBDA - a tool for CP star research in open clusters
... Abstract. WEBDA (http://www.univie.ac.at/webda) is a site devoted to stellar observational data, such as chemically peculiar stars, in stellar clusters in the Milky Way and the Small Magellanic Cloud. It is intended to provide a reliable synthesis of the available data and knowledge about these obje ...
... Abstract. WEBDA (http://www.univie.ac.at/webda) is a site devoted to stellar observational data, such as chemically peculiar stars, in stellar clusters in the Milky Way and the Small Magellanic Cloud. It is intended to provide a reliable synthesis of the available data and knowledge about these obje ...
Open cluster
An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. They are loosely bound by mutual gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center, resulting in a migration to the main body of the galaxy as well as a loss of cluster members through internal close encounters. Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for longer. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.Young open clusters may still be contained within the molecular cloud from which they formed, illuminating it to create an H II region. Over time, radiation pressure from the cluster will disperse the molecular cloud. Typically, about 10% of the mass of a gas cloud will coalesce into stars before radiation pressure drives the rest of the gas away.Open clusters are key objects in the study of stellar evolution. Because the cluster members are of similar age and chemical composition, their properties (such as distance, age, metallicity and extinction) are more easily determined than they are for isolated stars. A number of open clusters, such as the Pleiades, Hyades or the Alpha Persei Cluster are visible with the naked eye. Some others, such as the Double Cluster, are barely perceptible without instruments, while many more can be seen using binoculars or telescopes. The Wild Duck Cluster, M11, is an example.