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: http://www.stsci.edu/~inr/thisweek1/thisweek316.html
Дата изменения: Mon Nov 12 23:10:56 2007 Дата индексирования: Tue Oct 2 14:19:26 2012 Кодировка: Поисковые слова: galactic cluster |
Program Number | Principal Investigator | Program Title | Links |
10583 | Chris Stubbs, Harvard University | Resolving the LMC Microlensing Puzzle: Where Are the Lensing Objects ? | Abstract |
10766 | Andreas Zezas, Smithsonian Institution Astrophysical Observatory | A Deep X-ray Survey of the Small Magellanic Cloud | Abstract |
10832 | Brian M. Patten, Smithsonian Institution Astrophysical Observatory | Solving the microlensing puzzle: An HST high-resolution imaging approach | Abstract |
10854 | Karl Stapelfeldt, Jet Propulsion Laboratory | Coronagraphic Imaging of Bright New Spitzer Debris Disks II | Abstract |
10872 | Harry Teplitz, California Institute of Technology | Lyman Continuum Emission in Galaxies at z=1.2 | Abstract |
11103 | Harald Ebeling, University of Hawaii | A Snapshot Survey of The Most Massive Clusters of Galaxies | Abstract |
11113 | Keith S. Noll, Space Telescope Science Institute | Binaries in the Kuiper Belt: Probes of Solar System Formation and Evolution | Abstract |
11116 | Steven H. Saar, Smithsonian Institution Astrophysical Observatory | Exploring the Early FUV History of Cool Stars: Transition Regions at 30 Myr | Abstract |
11130 | Luis Ho, Carnegie Institution of Washington | AGNs with Intermediate-mass Black Holes: Testing the Black Hole-Bulge Paradigm, Part II | Abstract |
11134 | Karen Knierman, University of Arizona | WFPC2 Tidal Tail Survey: Probing Star Cluster Formation on the Edge | Abstract |
11143 | Andrew J. Baker, Rutgers the State University of New Jersey | NICMOS imaging of submillimeter galaxies with CO and PAH redshifts | Abstract |
11146 | Daniela Calzetti, University of Massachusetts | The Role of Stellar Feedback in Galaxy Evolution | Abstract |
11155 | Marshall D. Perrin, University of California - Berkeley | Dust Grain Evolution in Herbig Ae Stars: NICMOS Coronagraphic Imaging and Polarimetry | Abstract |
11157 | Joseph H. Rhee, University of California - Los Angeles | NICMOS Imaging Survey of Dusty Debris Around Nearby Stars Across the Stellar Mass Spectrum | Abstract |
11163 | Paula Szkody, University of Washington | Accreting Pulsating White Dwarfs in Cataclysmic Variables | Abstract |
11175 | Sandra M. Faber, University of California - Santa Cruz | UV Imaging to Determine the Location of Residual Star Formation in Galaxies Recently Arrived on the Red Sequence | Abstract |
11178 | William M. Grundy, Lowell Observatory | Probing Solar System History with Orbits, Masses, and Colors of Transneptunian Binaries | Abstract |
11191 | Wei-Hao Wang, Associated Universities, Inc. | NICMOS Imaging of a z>4 High-Redshift Ultraluminous Submillimeter Source | Abstract |
11199 | Lee W. Hartmann, University of Michigan | A Hard Look at Stellar Disks at the Epoch of Planet Formation | Abstract |
11202 | Leon Koopmans, Kapteyn Astronomical Institute | The Structure of Early-type Galaxies: 0.1-100 Effective Radii | Abstract |
11204 | Kevin Luhman, The Pennsylvania State University | Imaging Circumstellar Disks and Envelopes around Proto-Brown Dwarfs | Abstract |
11211 | George Fritz Benedict, University of Texas at Austin | An Astrometric Calibration of Population II Distance Indicators | Abstract |
11215 | Scott Anderson, University of Washington | New Sightlines for the Study of Intergalactic Helium: Dozens of High-Confidence, UV-Bright Quasars from SDSS/GALEX | Abstract |
11233 | Giampaolo Piotto, Universita di Padova | Multiple Generations of Stars in Massive Galactic Globular Clusters | Abstract |
11312 | Graham Smith, University of Birmingham | The Local Cluster Substructure Survey (LoCuSS): Deep Strong Lensing Observations with WFPC2 | Abstract |
GO 10583: Resolving the LMC Microlensing Puzzle: Where Are the Lensing Objects ?
GO 11113: Binaries in the Kuiper Belt: Probes of Solar System Formation and Evolution
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The Kuiper Belt consists of icy planetoids that orbit the Sun within a broad band stretching from Neptune's orbit (~30 AU) to distance sof ~50 AU from the Sun (see David Jewitt's Kuiper Belt page for details). Over 500 KBOs are currently known out of a population of perhaps 70,000 objects with diameters exceeding 100 km. Approximately 2% of the known KBOs are binary (including Pluto, one of the largest known KBOs, regardless of whether one considers it a planet or not). This is a surprisingly high fraction, given the difficulties involved in forming such systems and the relative ease with which they can be disrupted. It remains unclear whether these systems formed from single KBOs (through collisions or 3-body interactions) as the Kuiper Belt and the Solar System have evolved, or whether they represent the final tail of an initial (much larger) population of primordial binaries. This proposal will use WFPC2 imaging of known KBOs to identify new binary systems. |
GO 11211: An Astrometric Calibration of Population II Distance Indicators
GO 11233: Multiple Generations of Stars in Massive Galactic Globular Clusters
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Globular clusters are remnants of the first substantial burst of star formation in the Milky Way. With typical masses of a few x 10M5 solar masses, distributed among several x 106 stars, the standard picture holds that these are simple systems, where all the stars formed in a single starburst and, as a consequence, have the same age and metallicity. Until recently, the only known exception to this rule was the cluster Omega Centauri, which is significantly more massive than most clusters and has both double main sequence and a range of metallicities among the evolved stars. Omega Cen has been joined by at least one more cluster, NGC 2808, which shows evidence for three distinct branches to the main sequence. The origin of this feature is notknown, but it may be significant that NGC 2808 is also one of the more massive clusters, and might therefore be able to survive several burst of star formation (or, conversely, be the product of a multi proto-globular merger). The present program aims to use WFPC2 to obtain high-precision photometry of other massive globulars, such as NGC 1851, M80 and M13. |