REACH FOR THE STARS MLK 2009
... Approximately what % of all stars are found on the main sequence? __________ What bodies are involved in a Type I supernova? ____________________________________ What does a White Dwarf leave behind following a Type I supernova event? _______________________. How long does an O star live on the main ...
... Approximately what % of all stars are found on the main sequence? __________ What bodies are involved in a Type I supernova? ____________________________________ What does a White Dwarf leave behind following a Type I supernova event? _______________________. How long does an O star live on the main ...
ppt
... positions as a function of epoch over all plates on which a star appears. New proper motions are calculated, and the process is iterated until it converges to the final proper motion values. Proper-motion uncertainties are determined from the scatter about the best-fit line. Typically, the reference ...
... positions as a function of epoch over all plates on which a star appears. New proper motions are calculated, and the process is iterated until it converges to the final proper motion values. Proper-motion uncertainties are determined from the scatter about the best-fit line. Typically, the reference ...
Down Under from North Florida
... Nebula or the magnificent 47 Tucanae globular cluster. Yet with careful planning, several interesting and beautiful southern sky objects can be found in far southern skies. For example, the sky’s second brightest appearing star, Canopus (Alpha Carinae), remains invisible from most of USA locations. ...
... Nebula or the magnificent 47 Tucanae globular cluster. Yet with careful planning, several interesting and beautiful southern sky objects can be found in far southern skies. For example, the sky’s second brightest appearing star, Canopus (Alpha Carinae), remains invisible from most of USA locations. ...
Chapter 19. Mapping the Universe from Herschel to Sloan
... he took into account that stars have different absolute magnitudes. He had to obtain the spectral type of each star mapped and use that to determine its absolute magnitude. Again, he neglected interstellar extinction – a fact which led to serious errors in his map. Both Herschel and Kapteyn got the ...
... he took into account that stars have different absolute magnitudes. He had to obtain the spectral type of each star mapped and use that to determine its absolute magnitude. Again, he neglected interstellar extinction – a fact which led to serious errors in his map. Both Herschel and Kapteyn got the ...
The cosmic distance scale
... nearest galaxy cluster contains large numbers of spirals and ellipticals has been the site of a few SN it has been recently possible to observe cepheids, and hence to derive a distance which involves less intermediate calibrations – it is a fairly average type of cluster: distances beyond it are ref ...
... nearest galaxy cluster contains large numbers of spirals and ellipticals has been the site of a few SN it has been recently possible to observe cepheids, and hence to derive a distance which involves less intermediate calibrations – it is a fairly average type of cluster: distances beyond it are ref ...
5 Understanding stars and star ClUsters
... Astronomers know that this object is orbiting another object or objects, and its motion helps astronomers to identify double- and multiple-star systems. Many of these stars are much too close together to see as separate objects even in the biggest telescopes. These objects are known as spectroscopic ...
... Astronomers know that this object is orbiting another object or objects, and its motion helps astronomers to identify double- and multiple-star systems. Many of these stars are much too close together to see as separate objects even in the biggest telescopes. These objects are known as spectroscopic ...
the printable Observing Olympics Object Info Sheet in pdf
... stars to produce this gas is ∿5.5 million years. NGC5846 was discovered by Willian Herschel on Feb. 24, 1786. NGC5907 – This edge-on spiral galaxy is located approximately 50 million light years from Earth and is also known as the “Knife Edge” or “Splinter” Galaxy. Visually it appears as a very thin ...
... stars to produce this gas is ∿5.5 million years. NGC5846 was discovered by Willian Herschel on Feb. 24, 1786. NGC5907 – This edge-on spiral galaxy is located approximately 50 million light years from Earth and is also known as the “Knife Edge” or “Splinter” Galaxy. Visually it appears as a very thin ...
HR Diagram of a Star Cluster
... A cluster of stars which is localized in space is usually localized in time also. Surprisingly, the brightness (magnitude) of the stars in two different color bands can be interpreted to tell the cluster's age and distance from Earth. This is done by plotting a magnitude vs. color diagram (as Hertzs ...
... A cluster of stars which is localized in space is usually localized in time also. Surprisingly, the brightness (magnitude) of the stars in two different color bands can be interpreted to tell the cluster's age and distance from Earth. This is done by plotting a magnitude vs. color diagram (as Hertzs ...
ON THE FORMATION OF MASSIVE STELLAR CLUSTERS
... et al. 1995; Lipscy & Plavchan 2004; Melo et al. 2004), and NGC 253 (Watson et al. 1996) as well as in galaxies of different types (see also Larsen & Richtler 2000 and Larsen 1999). This star-forming activity in which masses similar to the total gas content found in galactic giant molecular clouds ( ...
... et al. 1995; Lipscy & Plavchan 2004; Melo et al. 2004), and NGC 253 (Watson et al. 1996) as well as in galaxies of different types (see also Larsen & Richtler 2000 and Larsen 1999). This star-forming activity in which masses similar to the total gas content found in galactic giant molecular clouds ( ...
November - LVAstronomy.com
... monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on ...
... monthly summary. We also accept digital imaging. Visual astronomy depends on what’s seen through the eyepiece. Not only does it satisfy an innate curiosity, but it allows the visual observer to discover the beauty and the wonderment of the night sky. Before photography, all observations depended on ...
Multi-physics simulations using a hierarchical interchangeable
... (2010) and the stellar evolution code Hurley et al. (2000). The first dynamical model is used for the integration of the equations of motion of the stars, the second module is used for the gravitational coupling between the gas-particles and the stars. The combined solver consists of an integrator f ...
... (2010) and the stellar evolution code Hurley et al. (2000). The first dynamical model is used for the integration of the equations of motion of the stars, the second module is used for the gravitational coupling between the gas-particles and the stars. The combined solver consists of an integrator f ...
Stellar Lives (continued). Galaxies.
... Most open clusters are relatively young (<5 billion years). Globular clusters are typically old objects (12-16 billion years), the oldest objects in the galaxy. They place a limit on the possible age of the Universe. ...
... Most open clusters are relatively young (<5 billion years). Globular clusters are typically old objects (12-16 billion years), the oldest objects in the galaxy. They place a limit on the possible age of the Universe. ...
CCD BVRI and 2MASS Photometry of the Poorly Studied Open
... around the cluster center. The main photometric parameters have been estimated and compared with the results that determined for the cluster using JHKs 2MASS photometric database. The cluster’s diameter is estimated to be 10 arcmin; the reddening E(B-V)= 0.68 ± 0.10 mag, E(J-H)= 0.21 ± 0.10 mag, the ...
... around the cluster center. The main photometric parameters have been estimated and compared with the results that determined for the cluster using JHKs 2MASS photometric database. The cluster’s diameter is estimated to be 10 arcmin; the reddening E(B-V)= 0.68 ± 0.10 mag, E(J-H)= 0.21 ± 0.10 mag, the ...
81 KB - CSIRO Publishing
... (Walsh, Jerjen & Willman 2007) are all low surfacebrightness objects discovered recently in deep surveys. They have low luminosities of MV , 2 (stellar masses of a few hundred solar masses) and half-light sizes of rh , 30 pc. Such values place them at the extreme of the globular cluster distributio ...
... (Walsh, Jerjen & Willman 2007) are all low surfacebrightness objects discovered recently in deep surveys. They have low luminosities of MV , 2 (stellar masses of a few hundred solar masses) and half-light sizes of rh , 30 pc. Such values place them at the extreme of the globular cluster distributio ...
The Milky Way and Its Neighbors
... in spiral arms is very bright in UV Young stars emit towards UV Several types shown below ...
... in spiral arms is very bright in UV Young stars emit towards UV Several types shown below ...
lecture25
... What is the shape of the Milky Way galaxy? How do we know where we are in the Galaxy? What wavelengths of radiation effectively penetrate the dusty interstellar medium? How do we know the rotating structure of the ...
... What is the shape of the Milky Way galaxy? How do we know where we are in the Galaxy? What wavelengths of radiation effectively penetrate the dusty interstellar medium? How do we know the rotating structure of the ...
Gugus Bintang [Compatibility Mode]
... • Yes, clusters of galaxies that are grouped together by gravity are called superclusters. Superclusters usually contain dozens of clusters and are spread over a volume of space with a diameter of about 150 million light years. • Our local group is a member of the supercluster of galaxies centered o ...
... • Yes, clusters of galaxies that are grouped together by gravity are called superclusters. Superclusters usually contain dozens of clusters and are spread over a volume of space with a diameter of about 150 million light years. • Our local group is a member of the supercluster of galaxies centered o ...
The Final Flight of Atlantis - Westchester Amateur Astronomers
... Star clusters are important because, within each cluster, member stars are probably at the same distance from the Sun, and have the same age and the same initial chemical composition. So, the study of globular clusters has now become an indispensable tool for astronomers specializing in stellar evol ...
... Star clusters are important because, within each cluster, member stars are probably at the same distance from the Sun, and have the same age and the same initial chemical composition. So, the study of globular clusters has now become an indispensable tool for astronomers specializing in stellar evol ...
The Origin of the Milky Way
... a huge disk, and a galactic halo surrounding both. • The diameter of the disk is 30kpc (100,000 light years). • The thickness of the disk is only 300pc (1000 light years) on average. • The total detectable mass is 200 billion solar masses. ...
... a huge disk, and a galactic halo surrounding both. • The diameter of the disk is 30kpc (100,000 light years). • The thickness of the disk is only 300pc (1000 light years) on average. • The total detectable mass is 200 billion solar masses. ...
charts_set_9
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
... - contains young and old stars, gas, dust. Has spiral structure - vertical thickness roughly 100 pc - 2 kpc (depending on component. Most gas and dust in thinner layer, most stars in thicker layer) ...
The Solar Neighborhood
... The globular star clusters are bright, and can be seen for a long distance. Their distances can be estimated accurately from their main sequence turnoffs, as well as by measuring the periods of variable stars that belong to each cluster. In the table below are listed several dozen Galactic globular ...
... The globular star clusters are bright, and can be seen for a long distance. Their distances can be estimated accurately from their main sequence turnoffs, as well as by measuring the periods of variable stars that belong to each cluster. In the table below are listed several dozen Galactic globular ...
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.