Highlights of Astronomy: As Presented at the XXIIIrd General - download pdf or read online

By D. C. Heggie, Mirek Giersz, Rainer Spurzem, Koji Takahashi (auth.), J. Andersen (eds.)

ISBN-10: 0792355563

ISBN-13: 9780792355564

ISBN-10: 9401147787

ISBN-13: 9789401147781

Since 1967, the most medical occasions of the overall Assemblies of the overseas Astronomical Union were released within the separate sequence, Highlights of Astronomy. the current quantity eleven offers the most important medical displays made on the XXIIIrd common meeting, August 18-30, 1997, in Kyoto, Japan. the 2 volumes (11A+B) include the texts of the 3 Invited Discourses in addition to the complaints or prolonged summaries of the 21 Joint Discussions and particular classes held through the common Assembly.

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Extra info for Highlights of Astronomy: As Presented at the XXIIIrd General Assembly of the IAU, 1997

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Its architecture is the most important design decision, since it determines the cost, performance, accuracy, range Host Computer GRAPE O(N 2) force calculation O(N) calculations Figure 1. Basic structure of GRAPE 597 598 J. MAKINO of applications, in other words, practically all aspects of the machine. Here, we briefly discuss the difference between GRAPE-4 processor chip (the HARP chip) and GRAPE-6 chip. To design and fabricate a chip is a time-consuming process, which we'd like to avoid if not absolutely necessary.

The dataset includes short exposures of 47 Thc, MI5, M3 and MI3 obtained with the aberrated Planetary Camera-I (PC-I) and F555W ("V") and F785LP ("I") filters, as well as post-refurbishment Wide Field Planetary Camera 2 (WFPC2) snapshots of the post core collapse clusters MI5, M30, and NGC 6624 in F336W ("U"), F439W ("E"), and V. Recently, a very deep, doubly oversampled PC-I U image of the core of 47 Thc, and accompanying E and V images, have also been analyzed. In addition, we have carried out extensive checks of incompleteness and photometric error with the help of multiband image simulations that mimic the relevant characteristics of the HST PC-I and WFPC2 images: empirical point spread function, crowding effects based on a realistic density profile and stellar luminosity function (LF), noise, undersampling, A/D saturation, etc ..

The Controversy Surrounding the Core Radius of 47 TucThe core radius of 47 Tuc has been the subject of debate during the last 5 years. Guhathakurta et al. (1992) measured r eore = 23/1 from PC-I V-band star counts, in agreement with previous ground based analyses of the light profile. Using pre-repair ultraviolet FOC and PC-I images, respectively, Calzetti et al. (1993) suggested that 47 Tuc is on the verge of core collapse (reore < 15/1), while De Marchi et al. (1996) claimed the cluster is in post collapse reexpansion (reore = 12/1).

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Highlights of Astronomy: As Presented at the XXIIIrd General Assembly of the IAU, 1997 by D. C. Heggie, Mirek Giersz, Rainer Spurzem, Koji Takahashi (auth.), J. Andersen (eds.)


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