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. ...

Еще в разделе: (Показать все результаты (>377) - zebu.uoregon.edu/ )

• The Galaxy Gallery Page IX: Clusters of Galaxies
• Observational Constraints

... 87.1083Owen+ VIII/29 1400-MHz Survey of 1478 Abell Clusters of Galaxies (Owen+ 1982) ================================================================================ A 1400-MHz Survey of 1478 Abell Clusters of Galaxies Owen F.N., White R.A., Hilldrup K.C., Hanisch R.J. =1982AJ.. ... 0,] Major axis error 70- 71 A2 --- n_MajAxi *[ A, B, C,NR, ] Major axis note 73- 74 I2 arcmin MinAxi *? ... Note on dist-C: Ratio of the distance of the source from the cluster center to the corrected Abell cluster...

Еще в разделе: (Показать все результаты (>1793) - www.sao.ru/ )

• Density Determination
• Radio data
• A 20 cm VLA survey of Abell clusters of galaxies

Today's APOD | ... Editor's choices for the most educational Astronomy Pictures of the Day about open clusters: . APOD: 2006 January 9 - M45: The Pleiades Star Cluster . ... The Pleiades contains over 3000 stars, is about 400 light years away, and only 13 light years across. ... Two types of star clusters are visible in our Milky Way Galaxy : open clusters and globular clusters . ... Aged 80 million years, M47 is a smaller but looser cluster of about 50 stars spanning 10 light-years. ... Index | ...

Еще в разделе: (Показать все результаты (>3852) - www.sai.msu.su/ )

• APOD Index - Galaxies: Clusters of Galaxies
• APOD: 2003 December 15 - Open Star Clusters M35 and NGC 2158
• APOD: 2002 November 29 - Open Star Clusters M35 and NGC 2158

... Kalirai and Harvey Richer of the University of British Columbia led the study, which began as an investigation of a globular star cluster in the Milky Way galaxy known as NGC 6397. ... Within the population of stars and galaxies behind NGC 6397, the Hubble image revealed a large elliptical galaxy that contains several hundred globular clusters. ... In fact, a single giant star in NGC 6397 appears 10 million times brighter than one of the distant globular clusters. ...

Еще в разделе: (Показать все результаты (>15237) - www.stsci.edu/ )

• Hubble Space Telescope Observations of Globular Clusters in M87 and an Estimate
• HST this week: 259
• HST this week: 110

... Globular Cluster M5 . ... Credit: Anglo-Australian Telescope Board Explanation: The globular cluster M5, pictured above, contains roughly 100,000 stars. ... Stars orbit the center of the cluster, and the cluster orbits the center of our Galaxy. So far, about 160 globular clusters are known to exist in a roughly spherical halo around the Galactic center . ... Publications with keywords: M5 - globular cluster . Publications with words: M5 - globular cluster . ... Globular Star Cluster M3 . ...

Еще в разделе: (Показать все результаты (>92943) - www.astronet.ru/ )

• Star Clusters Young and Old
• M46 and M47: Star Clusters Young and Old
• Wild Duck Open Cluster M11

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. ...

Еще в разделе: (Показать все результаты (>840) - www.astrosociety.org/ )

• ASP: Globular Clusters and Satellite Galaxies: Companions to the Milky Way
• ASP: A Taste of Real Astronomy ? The ESA/ESO Astronomy Exercises

... 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. ...

Еще в разделе: (Показать все результаты (>27) - www.inasan.rssi.ru/ )

• Globular Clusters: Self-Enrichment

J/AstL/vol/page SAI Open Clusters Catalog (Glushkova+, 2009) ================================================================================ Automated search for star clusters in large multiband surveys. ... Color excesses E(B-V), distance moduli and ages were determined for 141 new and 27 known, but poorly studied clusters. We present the Sternberg Astronomical Institute Open Clusters Catalog (SAI OCL Catalog) of coordinates, diameters and main physical parameters of these clusters. ...

Еще в разделе: (Показать все результаты (>222) - ocl.sai.msu.ru/ )

• SAI Open Star Clusters (SAI OCL) Catalog
• SAI OCL Catalog Description
• SAI OCL Catalog Berkeley 71

... Primordial theory review : Dick Bond . Defects and the CMB review : Andy Albrecht . ... Gravitational wave contribution to CMB anisotropies : V.B. Lukash and E.V. Mikheeva . C_l from cosmic strings : Lloyd Knox . Some aspects of CMB anisotropies induced from topological defects : Mairi Sakellariadou . ... CMB anisotropies from scaling sources : Ruth Durrer . ... SZ observations I : Sarah Church . ... Holes in the microwave sky? ... Detecting cosmic strings in the CMB : James Robinson . ...

Еще в разделе: (Показать все результаты (>1811) - www.mrao.cam.ac.uk/ )

• Astrophysics Group Cosmic Microwave Background (CMB)
• Astrophysics Group AMI Publications
• Astrophysics Group AMI Science

... The overall globular cluster population is divided by gap in the metallicity function at [Fe/H]=-1.0 into two discrete groups with well-defined maxima at [Fe/H]=-1.60?0.03 dex, and -0.60?0.04 dex. ... Clusters with extremely blue horizontal branches occupy a spherical volume of radius ~ 9 kpc, have high rotational velocities ( V rot =77?33 km/s), have substantial and equal negative radial and vertical metallicity gradients, and are, on average, the oldest group (the old-halo subsystem). ...

Еще в разделе: (Показать все результаты (>107) - ip.rsu.ru/ )

• Population of Galactic globular clusters, figures
• Globular clusters with anomalously small masses, figures
• Population of Galactic globular clusters, tabl

... galaxies: bulges galaxies: clusters: general galaxies: clusters: individual: . ... star formation statistics stellar content structure Cosmology ( cosmology :) cosmic background radiation ( cosmology :) cosmological parameters cosmology : miscellaneous cosmology : observations cosmology : theory ( cosmology :) dark ages, reionization, first stars ( cosmology :) dark energy ( cosmology :) dark matter ( cosmology :) diffuse radiation ( cosmology :) distance scale ( cosmology :) early Universe (...

Еще в разделе: (Показать все результаты (>192) - mavr.sao.ru/ )

• important_en
• articles_flera_en
• topic_en

... 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! ...

Еще в разделе: (Показать все результаты (>6335) - www.astronomy.com/ )

• Our Galaxy's oldest open clusters | Astronomy.com
• Soft shells and strange star clusters | Astronomy.com
• A star cluster hides star clusters | Astronomy.com

... LMC Project Outline . NGC 1818 Initial Results . ... The Large Magellanic Cloud (LMC) is uniquely suitable for the study of massive star clusters at all stages of evolution. By combining HST observations of these clusters with N-body models we hope to understand the origin and evolution of rich star clusters in our own Galaxy, in the LMC, and beyond. ... We aim to combine our HST observations with N-body models to understand the formation and evolution of globular clusters. ...

Еще в разделе: (Показать все результаты (>222) - www.stecf.org/ )

• ESLAB 2007

... December 13, 1997 . The Coma Cluster of Galaxies . ... The Coma Cluster of Galaxies pictured is one of the densest clusters known - it contains thousands of galaxies . Each of these galaxies house billions of stars - just as our own Milky Way Galaxy does. ... In fact, the Coma Cluster is so big it takes light millions of years just to go from one side to the other! Most galaxies in Coma and other clusters are ellipticals , while most galaxies outside of clusters are spirals . ...

Еще в разделе: (Показать все результаты (>7699) - www.arcetri.astro.it/ )

• APOD: 2000 January 12 - NGC 6791: An Old, Large Open Cluster
• A Search for Clustering around Herbig Ae/Be Stars
• SWXCS

... A few weeks ago, around a galaxy far, far away, a new type of mysterious БЂњdarkБЂќ star cluster was spotted. Our Galaxy, the Milky Way, is surrounded by about 150 groups of stars, which are called globular clusters. ... A galaxy called Centaurus A (sen-TOR-us Ay) is surrounded by thousands of globular clusters. ... These globular clusters aren't the only dark object in Centaurus A, at the centre of this galaxy lies a black hole that is 55 million times more massive than our Sun! ...

Еще в разделе: (Показать все результаты (>47206) - www.eso.org/ )

• Marina Rejkuba's Web Site
• ESO - Studying the Cosmological Evolution of Galaxy Clusters with (Sub-)mm
• ESO - Thesis Topic: Studying the first galaxy clusters with ALMA

... The default display type is Auto (ScanDisk ; adjusts to the current display). ... ScanTimeOut Determines whether ScanDisk should detect disk timeouts ; while performing a surface scan. ... Surface Determines whether ScanDisk will perform a surface scan: ; Never (Default) Does not perform a surface scan. ... The Prompt value causes ScanDisk to prompt you for a disk. ... The next five settings accept any of the following values: ; Prompt Causes ScanDisk to prompt you before fixing this problem. ...

Еще в разделе: (Показать все результаты (>2474) - www.naic.edu/ )

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

Searching for Ultra Compact Binaries in Globular Clusters What Are Ultra Compact Binaries? ... An ultra compact binary is a binary that consists two white dwarf To source the FITS files that contained the UV images, the sky coordinates stars and has an orbital period shorter than ~70min (A binary and the details on brightness for each star in each globular cluster we were consists of two stars orbiting around their centre of mass, it enables investigating, we used the XMM online archive. ...

Еще в разделе: (Показать все результаты (>2033) - star.arm.ac.uk/ )

• http://star.arm.ac.uk/ssab-workshop/landstreet/Cluster-project.pdf
• http://star.arm.ac.uk/~gar/research/globular.html
• JLE Dreyer

ABSOLUTE PROPER MOTIONS OF 331 OPEN CLUSTERS . ... The proper motions of stars in the fields of 331 open clusters were taken from Four-Million Star Catalog (4M-catalog) of positions and proper motions (Volchkov et al. ... The absolute proper motions for 21 young open clusters have been derived by comparison of precise relative proper motions of individual stars and their corresponding absolute proper motions. ... Sign of proper motions in RA . ... 0.0001 arcsec/yr . ... rms error in RA proper motion . ...

Еще в разделе: (Показать все результаты (>27) - www.sai.msu.ru/ )

... Posts tagged ?Globular Clusters? Oct 26th, 2007| 06:52 pm | ... I hope there are a paper or two drags your attentions and stimulates your thoughts in astrostatistics from arXiv. ... ArXiv] 4th week, Oct. ... Tags: Astrometry , Bayesian , Change Point , Globular Clusters , Matching , X-ray Binaries . ... This week, instead of only filtering AstroStatistics related papers from arxiv, I chose additional arxiv/astro-ph papers related to CHASC folks? astrophysical projects. ... ArXiv] 1st week, Oct. ...

Еще в разделе: (Показать все результаты (>2338) - hea-www.harvard.edu/ )

• The AstroStat Slog clusters
• Southern SHARC survey
• The AstroStat Slog globular cluster

Find Similar Abstracts . ... Intergalactic gas in galactic clusters, the microwave background radiation and cosmology . ... The types of information that can be obtained from astrophysical studies of the microwave background in the direction of galactic clusters and from radio observations of clusters are examined. ... Use: Authors Title Abstract Text Text Query with Keywords Return: Query Results Query Form Database: Astronomy Instrumentation Physics and Geophysics ABSTRACT QUERY USER FEEDBACK HELP ...

Еще в разделе: (Показать все результаты (>491) - xray.sai.msu.ru/ )

• Gravitational Wave Background from Individual Galaxies
• Seminars