August Evening Skies
... The planet Jupiter is plotted at map time, mid-August 2008. Seven objects of first magnitude or brighter are visible. In order of brightness they are: Jupiter, Arcturus, Vega, Altair, Antares, Spica, and Deneb. In addition to stars, other objects that should be visible to the unaided eye are labeled ...
... The planet Jupiter is plotted at map time, mid-August 2008. Seven objects of first magnitude or brighter are visible. In order of brightness they are: Jupiter, Arcturus, Vega, Altair, Antares, Spica, and Deneb. In addition to stars, other objects that should be visible to the unaided eye are labeled ...
- National Optical Astronomy Observatory
... 1496 was found to lie at a distance of 1.4 x 103 parsecs (4600 light years) from Earth. In addition, the cluster, which contains no evident spectral class O or B stars, is approximately 400 million years old. INTRODUCTION An open cluster is a group of gravitationally-bound stars that formed in a sin ...
... 1496 was found to lie at a distance of 1.4 x 103 parsecs (4600 light years) from Earth. In addition, the cluster, which contains no evident spectral class O or B stars, is approximately 400 million years old. INTRODUCTION An open cluster is a group of gravitationally-bound stars that formed in a sin ...
Omega Centauri
... Y=0.40 (e.g., Omega Centauri, NGC2808) 3.Clusters with broadened or splitted MS (as NGC6752 and 47Tuc) 4.Complex objects like M54 (= Omega Cen?) 5.Intermediate objects like M22 (=M54, Omega Cen?) 6.Clusters with double SGB or RGB (e.g., NGC 1851, NGC6388, NGC 5286, M4, and many others) 7.The LMC/SMC ...
... Y=0.40 (e.g., Omega Centauri, NGC2808) 3.Clusters with broadened or splitted MS (as NGC6752 and 47Tuc) 4.Complex objects like M54 (= Omega Cen?) 5.Intermediate objects like M22 (=M54, Omega Cen?) 6.Clusters with double SGB or RGB (e.g., NGC 1851, NGC6388, NGC 5286, M4, and many others) 7.The LMC/SMC ...
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. ...
Physics 127 Descriptive Astronomy Homework #20 Key
... Because the peak luminosity of a Type Ia supernova is well known, as they are all nearly identical, and because they are extremely luminous, they are superb standard candles for determining the distances of remote galaxies. They can be used for virtually any galaxy. However, there is a downside. The ...
... Because the peak luminosity of a Type Ia supernova is well known, as they are all nearly identical, and because they are extremely luminous, they are superb standard candles for determining the distances of remote galaxies. They can be used for virtually any galaxy. However, there is a downside. The ...
Andromeda Check-List - Norman Lockyer Observatory
... Best viewed through moderate sized telescopes but still worth searching out through any binoculars or telescopes. This compact cluster lies south of Herschel’s Garnett Star and what makes it interesting is that it is cocooned in a very large and bright nebula NGC7142 – Open Cluster – II 2 r – Modera ...
... Best viewed through moderate sized telescopes but still worth searching out through any binoculars or telescopes. This compact cluster lies south of Herschel’s Garnett Star and what makes it interesting is that it is cocooned in a very large and bright nebula NGC7142 – Open Cluster – II 2 r – Modera ...
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 ...
Integrative Studies 410 Our Place in the Universe
... • Classic example: Great Hercules Cluster (M13) • Spherical clusters • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
... • Classic example: Great Hercules Cluster (M13) • Spherical clusters • may contain millions of stars • Old stars • Great tool to study stellar life cycle ...
Colour - Magnitude Diagram for M 45
... The Pleiades is a relatively close open cluster. The six or seven stars visible to the naked eye form a tight grouping of stars (an asterism) near the even closer Hyades cluster. They are easily visible in the winter sky in the northern hemisphere. In this exercise, you will determine the colour of ...
... The Pleiades is a relatively close open cluster. The six or seven stars visible to the naked eye form a tight grouping of stars (an asterism) near the even closer Hyades cluster. They are easily visible in the winter sky in the northern hemisphere. In this exercise, you will determine the colour of ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... Stars are born in groups or clusters when a cold giant molecular cloud collapses under its own gravitational force. If many stars form all at once—that is, if star formation efficiency is high—they will stay together as a gravitationally bound open cluster (like the Pleiades) or a globular cluster ( ...
... Stars are born in groups or clusters when a cold giant molecular cloud collapses under its own gravitational force. If many stars form all at once—that is, if star formation efficiency is high—they will stay together as a gravitationally bound open cluster (like the Pleiades) or a globular cluster ( ...
UCSD Students` Presentation on Star Formation
... nuclear energy generated in the core matches the rate at which energy is released. ...
... nuclear energy generated in the core matches the rate at which energy is released. ...
The Galactic Super Star Cluster Westerlund 1
... expected from the integrated emission from premain sequence stars with M i<3 M. If we extrapolate from the observed stars using a Kroupa IMF, we find that Westerlund 1 is ~90 times the mass of Orion. Therefore, we would have expected diffuse emission with L x = 3x10 35 erg s-1, which is five times ...
... expected from the integrated emission from premain sequence stars with M i<3 M. If we extrapolate from the observed stars using a Kroupa IMF, we find that Westerlund 1 is ~90 times the mass of Orion. Therefore, we would have expected diffuse emission with L x = 3x10 35 erg s-1, which is five times ...
Globular Clusters
... • M13 and M5 • Nickel 40 Inch Reflector Telescope at Lick Observatory on Mt. Hamilton • Remote observing through video conference with Ellie Gates • Digital detector called a charge coupled device (CCD) • CCDs can detect photons but not color so we used filters to detect photons of different wavelen ...
... • M13 and M5 • Nickel 40 Inch Reflector Telescope at Lick Observatory on Mt. Hamilton • Remote observing through video conference with Ellie Gates • Digital detector called a charge coupled device (CCD) • CCDs can detect photons but not color so we used filters to detect photons of different wavelen ...
AST121 Introduction to Astronomy
... similar for all globular clusters. They are similar in age, ...
... similar for all globular clusters. They are similar in age, ...
Formation of Globular Clusters: In and Out of Dwarf Galaxies
... • Model explains observed sizes, masses, ages, metallicities • Dynamical evolution explains the present mass function and may be important for metallicity bimodality • Red clusters in the Galaxy are due to massive late gas-rich ...
... • Model explains observed sizes, masses, ages, metallicities • Dynamical evolution explains the present mass function and may be important for metallicity bimodality • Red clusters in the Galaxy are due to massive late gas-rich ...
The Milky Way
... • We define our age by trips around the Sun. • How many trips of Sun around Milky Way? R = 8.5 kpc V = 220km/s P = 2.5x108 yrs ...
... • We define our age by trips around the Sun. • How many trips of Sun around Milky Way? R = 8.5 kpc V = 220km/s P = 2.5x108 yrs ...
Westerlund 1 : A Super-Star Cluster within the Milky Way
... identified in the Milky Way. Wd1 hosts a rich population of OB supergiants, Wolf-Rayet stars, Luminous Blue Variables, Yellow Hypergiants and Red Supergiants, from which we infer an age of 3-5Myr. For an adopted Kroupa IMF we derive a mass of 105 M and radius of 0.3pc for an estimated distance of 2 ...
... identified in the Milky Way. Wd1 hosts a rich population of OB supergiants, Wolf-Rayet stars, Luminous Blue Variables, Yellow Hypergiants and Red Supergiants, from which we infer an age of 3-5Myr. For an adopted Kroupa IMF we derive a mass of 105 M and radius of 0.3pc for an estimated distance of 2 ...
School Supplies - Rowan County Schools
... Our solar system is located on the ___________ Arm – 30,000 light years from the center. Part of the __________ _________ of super clusters (Andromeda is also part of this group) Astronomers use __________ and _____________ telescopes to “see” the center of the galaxy We can’t actually “see” ...
... Our solar system is located on the ___________ Arm – 30,000 light years from the center. Part of the __________ _________ of super clusters (Andromeda is also part of this group) Astronomers use __________ and _____________ telescopes to “see” the center of the galaxy We can’t actually “see” ...
Interpreting the HR diagram of stellar clusters
... Stars are created deep within giant molecular clouds. When we look at such regions, we often see not just one, but a whole bunch of stars forming together. ...
... Stars are created deep within giant molecular clouds. When we look at such regions, we often see not just one, but a whole bunch of stars forming together. ...
a description of planets and stars you may see
... third-largest member of the Local Group of galaxies, which includes the Milky Way Galaxy, the Andromeda Galaxy. It is one of the most distant permanent objects that can be viewed with the naked eye. The Ring nebula (also known as M57) is a planetary nebula is located in the constellation of Lyra. It ...
... third-largest member of the Local Group of galaxies, which includes the Milky Way Galaxy, the Andromeda Galaxy. It is one of the most distant permanent objects that can be viewed with the naked eye. The Ring nebula (also known as M57) is a planetary nebula is located in the constellation of Lyra. It ...
Untitled - New Zealand Science Teacher
... Centaur, with bow, is outlined at left. It was only in the 17th Century that Crux was split off as a separate constellation. The slow wobble of Earth's axis allowed this part of the sky to be seen from more northerly places in ancient times. The fainter Pointer and the three bluish-white stars of th ...
... Centaur, with bow, is outlined at left. It was only in the 17th Century that Crux was split off as a separate constellation. The slow wobble of Earth's axis allowed this part of the sky to be seen from more northerly places in ancient times. The fainter Pointer and the three bluish-white stars of th ...
1 Astronomical Measurements and Quantities 2 Astronomical Objects
... Distance Ladder: The Hubble low (V=HD) and the expansion of the Universe. The Baade-Wesselink method. A brief overview of different methods treated through the course to go from very nearby objects to very distant ones. [K],[BM] Galaxy Clusters: Morphological classification. Main properties. Cluster ...
... Distance Ladder: The Hubble low (V=HD) and the expansion of the Universe. The Baade-Wesselink method. A brief overview of different methods treated through the course to go from very nearby objects to very distant ones. [K],[BM] Galaxy Clusters: Morphological classification. Main properties. Cluster ...
Lecture Notes-PPT
... between the stars, some stars reach escape velocity from the protocluster and become runaway stars. The rest become gravitationally bound, meaning they will exist as collection orbiting each other forever. ...
... between the stars, some stars reach escape velocity from the protocluster and become runaway stars. The rest become gravitationally bound, meaning they will exist as collection orbiting each other forever. ...
PH142 - Mohawk Valley Community College
... The purpose of this course is to give a student a full introductory coverage of astronomy, to provide a means of scientific explanation for new astronomical discoveries and theories, and to put into practice techniques learned in Descriptive Astronomy 1. At the conclusion of the course, the students ...
... The purpose of this course is to give a student a full introductory coverage of astronomy, to provide a means of scientific explanation for new astronomical discoveries and theories, and to put into practice techniques learned in Descriptive Astronomy 1. At the conclusion of the course, the students ...
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.