... November 4, 1997 . Blue Stragglers in Globular Clusters . Credit: M. Shara ( STScI ), R.A. Safer ( Villanova ), M. Livio ( STScI ), WFPC2 , HST , NASA . ... Circled are mysterious stars called " blue stragglers. Stars as bright and blue as blue stragglers live short lives , much shorter than the age of the host globular cluster itself. But this contradicts evidence that globular cluster stars formed all at once. ... About APOD > . ... NASA Technical Rep.: ...

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• APOD: 2002 November 29 - Open Star Clusters M35 and NGC 2158
• APOD: 2005 November 18 - The 37 Cluster
• APOD Index - Stars: Globular Clusters

... Blue Stagglers in Globular Clusters . ... Circled are mysterious stars called " blue stragglers. Stars as bright and blue as blue stragglers live short lives , much shorter than the age of the host globular cluster itself. But this contradicts evidence that globular cluster stars formed all at once. ... Publications with keywords: globular cluster - blue stragglers . Publications with words: globular cluster - blue stragglers . ... Blue Straggler Stars in Globular Cluster M53 . ...

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• NGC 1818: A Young Globular Cluster
• Wild Duck Open Cluster M11
• M11: The Wild Duck Cluster

home publications > mercury . ... Big Clusters, Tiny Galaxies . ... Astronomers struggle to understand why giant star clusters form in the tiniest of galaxies . ... These clusters are probably young versions of globular clusters, but they are commonly called super star clusters. Seven dwarf galaxies within 16 million light-years have formed super star clusters, with one of these galaxies, NGC 1569, possessing two young clusters. ... Super star clusters have a lot to tell us about star formation. ...

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Astronotes Armagh Planetarium's Stellar Blog! ... Comets and Asteroids . ... Image credit:ESO/J.Emerson/VISTA. ... However others are less pessimistic and it has even been claimed that the mysterious ?Wow! signal? received in 1977 originated from the direction M55.б  Sadly, this still unexplained pulse of radio energy originated from a location rather to the northwest of M55 so I doubt if the source was this cluster (if indeed the signal was genuinely of extraterrestrial origin). ... Mysterious Wow! ...

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Many intermediate-age star clusters in the Magellanic Clouds exhibit very unusual features in their colour-magnitude diagrams that suggest they may have formed their stars over periods spanning hundreds of millions of years per cluster. ... Nonetheless, this interpretation is enticing in the context of the formation of ancient globular clusters, which almost always exhibit puzzling abundance patterns that apparently require multiple episodes of star formation to explain. ...

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• GSAOI Super Star Clusters Science Page
• GSAOI Orion Nebula Cluster Science Page
• IAU Commission #37 (Star Clusters and Associations)

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Astrophysics graduate student programs . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

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• RV Tau Variables in Globular Clusters - clues on their nature?
• ATNF Colloquium
• Evolutionary Paths in Galaxy Morphology

... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Astronomy for Kids . ... Astronomy 101 . ... Astronomy Foundation . ... Do globular clusters form in a galaxy's halo or migrate in from outside? If the latter, how? ... The Milky Way Galaxy has a system of roughly 150 globular clusters, which are all older than 9 billion years. ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

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• Hubble observations cast further doubt on how globular clusters formed |
• Fossil star clusters reveal their age | Astronomy.com
• Spitzer finds ancient clusters | Astronomy.com

... A Snapshot Survey of The Most Massive Clusters of Galaxies . Abstract . ... Binaries in the Kuiper Belt: Probes of Solar System Formation and Evolution . ... SL2S: The Strong Lensing Legacy Survey . ... Increasing the Accuracy of HST Astrometry with FGS1r . ... GO 11113: Binaries in the Kuiper Belt: Probes of Solar System Formation and Evolution . A composite of HST images of the Kuiper Belt binary, WW31 . ... GO 11289: SL2S - The Strong Lensing Legacy Survey . ... Past weeks: . ...

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• Arunav Kundu
• High Redshift Cluster Projects
• HST this week: 301

... My primary research interests are the formation and evolution of nuclear star clusters. ... Nuclear star clusters are common objects in nearby galaxies. ... Feldmeier-Krause, A. ; Neumayer, N.; SchУЖdel, R.; Seth, A.; Hilker, M.; de Zeeuw, P. T.; Kuntschner, H.; Walcher, C. J.; LУМtzgendorf, N.; Kissler-Patig, M. Astronomy Astrophysics, accepted, 2015 . ... SchУЖdel, R.; Feldmeier, A. ; Neumayer, N.; Meyer, L.; Yelda, S. Classical and Quantum Gravity, Volume 31, Issue 24, 12/2014 . ... 2014 . ...

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• ESO - Thesis Topic: Studying the first galaxy clusters with ALMA
• ESO - Galaxy Clusters in the Early Universe
• Marina Rejkuba's Web Site

Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

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• Astronomy HyperText Book: Interstellar Medium
• Constrains on Dark Matter
• Astro-2 and the UIT Experiment

... 2001 March 11 . NGC 1818: A Young Globular Cluster . ... Explanation: Globular clusters once ruled the Milky Way . Back in the old days , back when our Galaxy first formed, perhaps thousands of globular clusters roamed our Galaxy . ... There are few, if any, young globular clusters in our Milky Way Galaxy because conditions are not ripe for more to form. ... Pictured above is a "young" globular cluster residing there: NGC 1818 . ... About APOD | ...

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• Arcetri Star-Formation Group Publications
• A Search for Clustering around Herbig Ae/Be Stars
• Elena Franciosini's Home Page

THE SUBSYSTEMS OF THE MILKY WAY HALO. ... A catalogue of homogeneous fundamental astrophysical parameters for 145 globular clusters is composed on the base of the data of compilative catalogue by Harris (1997) and from another literature. ... In addition, it has large rotation velocity ( V rot =77?33 km/s), appreciable radial and vertical metallicity gradients equal by value, and has the oldest average age (subsystem of the old halo). ... Characteristic parameter of globular cluster subsystems. ...

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• Vladimir Marsakov Abstracts

... Bad Astronomy . ... Bitesize Astronomy . ... The next step up are true clusters, called open clusters . Open clusters (sometimes misleadingly called "galactic clusters") are groups of stars ranging in size from a few dozen stars up to tens of thousands. ... The youngest is about 1 or 2 million years old, while the oldest is about 6 or 7 billion years, making it just older than our own solar system. ... So by looking at the stars in the cluster we can tell pretty well how old they are. ...

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A Canadian and American team of Astronomers have used the 305-m wide Arecibo radio dish, the world's largest and most sensitive radio telescope, to uncover a dozen new super-fast-spinning pulsars. The team directed their search for these rare and exotic stars by pointing the Arecibo radio telescope towards massive star clusters, called Globular Clusters, orbiting our Milky Way galaxy. ... One of the most exotic residents in the Globular cluster system are the millisecond pulsars. ...

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• New Resident Tax Information
• Catalogs and Publications
• The Pleiades

... ISC Kosmotras . Top Management Founder of ISC Kosmotras - Dr. Vladimir A. Andreev News . ... Dr. Vladimir A. Andreev, Founder of ISC Kosmotras, Member of the Board . ... Peaceful and rational use of RS-20 ICBMs after their withdrawal from service with the Russian Ministry of Defense (MoD) has been in the main focus of Dr. Andreev s attention since early 1990s. Dr. Andreev is one of the founders of an international cooperation program and process called the Dnepr Program . ... Dnepr Program . ...

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• Dnepr Launch Manifest
• Dnepr LV
• Launch Date of DubaiSat-2 cluster mission

... Structure of Data . ... Catalog . ... In SAI OCL Catalog, we introduce our work on investigation of the Milky Way system of open star clusters. The main goal of our study is a search for new clusters using huge surveys. 168 new clusters have been already discovered by us using J,H,Ks data from 2MASS point source catalog. ... For 141 new clusters, we found their physical parameters using J,H,Ks data from 2MASS catalog and, for a number of clusters, our UBVRI CCD observational magnitudes. ...

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• SAI OCL Catalog Publications
• SAI OCL Catalog Structure
• SAI OCL Catalog Description

... Dept. for Astrometry & Space Geodynamics . ... Dept. for Physics of Stars&Galaxies . Dept. for Space Plasma Physics . Dept. for Physics of Minor Celestial Bodies . Dept. for Physics of Planetary Systems . Dept. for Solar Physics . ... 2016,MNRAS, 2016MNRAS.tmp.. ... 2016,MNRAS, Vol.455 ,is.1,p.357-369. ... 2016,MNRAS, Vol.456 ,is.1,p.181-191. ... WASP- 22, WASP-41, WASP- 42 and WASP- 55. ... 2016,MNRAS, Vol.456 ,Is.1,p.990-1002. ... 2016,MNRAS, Vol.457 ,is.1,p.64-73. ...

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• Achievements - Page 4
• MAO NASU :: Topic: 1st Announcement IAU Symposium 312 Star Clusters and Black
• The Laboratory of Astrometry

Valentina Klochkova . Klochkova V.G. 21 Jan 08:14:27 GMT+0300 2016

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• GRB follow-up team
• Publications

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Portrait of Sir William Herschel (1738-1822) Royal Astronomical Society . Probably the most famous astronomer of the 18th century, Sir William Herschel discovered, in addition to the planet Uranus, many new nebulae, clusters of stars and binary stars. ... Other Herschel Family Portraits . Mirror by Herschel . Return to A Short History of Armagh Observatory . Last Revised: 2009 November 23rd . ...

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• Research Interests
• About me
• Armagh Observatory

... The routines implemented are CLUSTER which has 8 options for hierarchical clustering and PARTITION which carries out non--hierarchical clustering. ... The former is non--hierarchical clustering or partitioning. The latter is hierarchical clustering. Brief consideration will show that a sequence of n-1 agglomerations are needed to successively merge the two closest objects and/or clusters at each stage, so that we have a set of n (singleton) clusters, n-1 clusters, ..., 2 clusters, 1 cluster. ...

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• Old "Structure" publications
• Space-Time with Bound Cluster
• Age of the Universe