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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• Index of /groups/cluster/CEP/RADVEL
• APOD: 2009 January 23 - Globular Cluster NGC 2419
• APOD: 2005 November 18 - The 37 Cluster

... 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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• A 1400-MHz Survey of 1478 Abell Clusters of Galaxies
• Space-Time with Bound Cluster
• A VLA Survey of Rich Clusters of Galaxies I.

... GSAOI Home . ... Science . ... The goal of this project is to detect the termination of the white dwarf cooling sequence in nearby open star clusters, and hence derive cluster ages that are independent of the normal main sequence turnoff method. ... The potential for accurate proper motion measurements, i.e., measurements of transverse motion across the sky, with GSAOI offers a means of overcoming this difficulty. ...

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• GSAOI Globular Cluster Science Page
• How far away is Virgo?
• Dougal Mackey - Research

... Classifying or clustering (or semi supervised learning) spectra is a very challenging problem from collecting statistical-analysis-ready data to reducing the dimensionality without sacrificing complex information in each spectrum. ... Continue reading ?[ ... Category: Algorithms , arXiv , Cross-Cultural , Data Processing , Jargon , Methods , Spectral , Stat | ... Category: Algorithms , arXiv , Astro , Bad AstroStat , Cross-Cultural , Data Processing , Frequentist , Jargon , Methods , Stat | ... ADS ...

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• The AstroStat Slog globular cluster
• The AstroStat Slog outliers
• The AstroStat Slog Blog Archive my first AAS. IV. clustering

... The biggest difference is seen for the Pleiades, and our hypothesis is that if the Hipparcos distance to the Pleiades is correct, then similar subluminous ZAMS stars should exist elsewhere, including the immediate solar neighborhood. ... 2 ) University of California Observatories/Lick Observatory Board of Studies in Astronomy and Astrophysics University of California, Santa Cruz CA 95064 . 3 ) Dept. of Physics and Astronomy San Francisco State University, San Francisco CA 94132 . ...

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• Fundamental Parameters, Integrated Red Giant Branch Mass Loss, and Dust
• HST this week: 212
• HST this week: 252

... In 1930, Trumpler noticed that linear diameters (LD) of open clusters increase with distance (D) from the Sun. ... Since that time, the interstellar absorption has become one of the best studied factor in astrophysics, and we may hope that current OCL distance scales are free from this LD-D correlation. To verify if this is the case we have chosen several modern OCL distance scales and test them with the same clusters and the same angular diameters that Trumpler had used back in 1930. ...

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• Globular Clusters: Self-Enrichment

... The relationship of the mass and the observed galactocentric distance R -- (a), and that of the mass and the total dissipation velocity n taken from Gnedin, Ostriker (1997) -- (b). The dotted line in diagram (a) shows the "cone of survival" according to the paper by Surdin and Arkhipova (1998) . ... The solid line is a regression stright line for the main sequence of clusters, and the dotted line parallel to it separates the sequence of clusters of anomalously small mass shown by open triangles. ...

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• Population of Galactic globular clusters, figures
• Vladimir Marsakov Abstracts

... NGC1850: Star Cluster in the LMC . ... Credit: R. Gilmozzi ( STScI / ESA ) S. Ewald, ( JPL ), NASA Explanation: NGC1850 is a large cluster of stars located a mere 166,000 light-years from Earth in our neighboring galaxy the Large Magellanic Cloud (LMC). ... Yellowish stars are the main cluster stars, sun-like main sequence hydrogen burners about 50 million years old. ... Publications with keywords: star cluster - LMC - stellar evolution - star - cluster - NGC 1850 . ... The Star Clusters of NGC 1313...

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• NGC 7789: Galactic Star Cluster
• Globular Cluster NGC 2419
• Астронет > NGC 7789: Galactic Star Cluster

Rastorguev А.S. "Astronomical Distances" (Lecture course for postgraduates, 2009-2016) . Part 1. ... Trigonometric parallaxes of stars. Moving clusters distances. ... Photometric distances: general approach. Normal stars as "standard candles". ... Main Sequence fitting or distance scale of star clusters. ... Moving photospheres technique. Cepheid distance scale and P-L relations. RR Lyrae distance scale. ... Globular clusters luminosity function. ...

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... The exercises are now available on the web and in six booklets (100 pages in total), titled: . ... Exercise 1: Measuring the Distance to Supernova 1987A", . Exercise 2: The Distance to Messier 100 as Determined by Cepheid Variable Stars", . Exercise 3: Measuring the Distance to the Cat's Eye Nebula" and . Exercise 4: Measuring a Globular Star Cluster's Distance and Age". ... More exercises will follow in the future. ... Exercise 3 - Measuring the Distance to the Cat's Eye Nebula . ...

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• ASP: Big Clusters, Tiny Galaxies
• ASP: Globular Clusters and Satellite Galaxies: Companions to the Milky Way
• ASP: NGC Images on the Net

... 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 Description
• SAI OCL Catalog Berkeley 71
• SAI OCL Catalog Berkeley 19

... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... What are typical star-to-star distances in globular clusters compared to stellar distances in our region of the galaxy? ... RELATED TOPICS: GLOBULAR CLUSTERS . ... Get instant access to subscriber content on Astronomy.com! ...

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• Our Galaxy's oldest open clusters | Astronomy.com
• star clusters | Astronomy.com
• open clusters | Astronomy.com

... The idea of an ALFA Virgo Survey is very excited. We should go for full coverage of the Virgo cluster, that is 800 square degrees. ... To interpret and understand the results of such a survey will require a lot of complimentary data. In Milano, we have developed the Galaxy On Line Database Milano Network or GOLDMiNe . ... This site provides on line selection of multiwavelength data for galaxies in both the Virgo cluster and the Coma supercluster. ...

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• Jodrell Multi-beam Virgo Survey
• The Pleiades
• Pulsar Highlights - A Dozen new MSPs in Globular Clusters

... Naming technique {a,c,e,f} = {a,b,c,d,e,f,g,h} log || +1 a b c d e f g h {a,c,e,f,g} Names = {[1],[2],[3],[4],[5],[6],[7],[8],[9],[10]} {a,c,e,g} Fingerprints ={[7],[9],[10]} Amir, Apostolico, Landau, Satta 2003 k distinct characters Changing a character: O( log || log n) (n new names maximum by level) One iteration: n log || log n || iterations: || n log || log n Important: different set of ... Approximate fingerprint Distance by fingerprints 2D fingerprints ...

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• http://www.mccme.ru/albio/slides/makeev.pdf
• http://www.mccme.ru/albio/slides/christen.pdf
• http://www.mccme.ru/albio/slides/filimonov.pdf

RED SEQUENCE DWARF GALAXIES IN CLUSTERS F. G. Kopylova and A.I. Kopylov Special astrophysical observatory, Russian Academy of Sciences Red sequence galaxies in clusters are an important population for understanding galaxy formation and evolution in general. ... To study the red sequence luminosity function and dwarf-to-giant ratio (DGR), we select 10 clusters of galaxies of the Leo Supercluster (z 0.035, D 150 · h-1 M pc) (Fig.1). ...

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• articles_flera_en
• important_en
• articles_alex_01

... July 9, 1999 . NGC 7789: Galactic Star Cluster . ... Explanation: At 1.6 billion years old, this cluster of stars is beginning to show its age. NGC 7789 is an open or galactic star cluster about 8,000 light-years distant toward the constellation Cassiopeia and lies near the plane of our Milky Way galaxy. ... These have evolved from main sequence stars like the sun into the gaggle of red giant stars apparent (with a reddish-yellow cast) in this lovely composite color image. ... About APOD > . ...

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• HAEBE Clusters Analysis (Abstract)
• Young stellar clusters in the star forming region NGC 6357
• Arcetri Star-Formation Group Publications

The new view on the population of Galactic open clusters A.E.Piskunov1, N.V.Kharchenko2, S.RЖser3, E.Schilbach3, R.-D.Scholz4 1 2 3 4 Institute of Astronomy, Moscow, Russia Main Astronomical ... Observatory, Kiev, Ukraine Astronomisches Rechen-Institut, Heidelberg, Germany Astrophysikalisches Institut Potsdam, Germany What are open clusters and what do they teach us Groups of Population I ... Cluster complexes: OCC-1 = Gould's Belt cluster complex? ...

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... Science . ... Science Users Information > Science Activities > Science in Garching > Research Area: STELLAR POPULATIONS . ... Research Area: STELLAR POPULATIONS . Subject in this research area aim at understanding the stellar content of nearby star clusters and galaxies with the goal of understanding their formation and evolution history. ... Evolution of Galaxies and the ISM Stellar Populations Faculty . ... Planets and Star Formation Stellar Populations Stellar Structure and Evolution Faculty . ...

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• ESO - Thesis Topic: Next generation Fornax Cluster surveys
• ESO - Obscured star cluster population in the Milky Way
• ESO - Thesis Topic: Studying the first galaxy clusters with ALMA

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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• Hubble shows us a spectacular star cluster | Astronotes
• Omega Centauri: globular cluster of 300,000 stars | Astronotes
• Hubble Space Telescope sees into Omega Centauri's future | Astronotes