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1021. WWW as a Support for the Long Term LBT Archive
... When a project is the common effort of a number of institutions, as in the case of the Large Binocular Telescope Project, where several institutions in different countries are cooperating, the most natural structure of the archive is a distributed one, where each party has responsibility over a part of the database, but shares the data with the others. ... WWW services can then provide a consistent access to the whole archive for all the involved parties. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/finil.html -- 13.2 Кб -- 03.11.2000
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1022. IMPORT/EXPORT: Image Conversion Tools for IRAF
... We present a set of IRAF tasks for converting foreign image formats to and from the native IRAF format. Traditionally, this has been done by writing individual one-to-one conversion utilities, either as single tasks or as procedures within a multiple-format conversion tool. ... When exporting IRAF images to other formats the only built-in knowledge of the format is the structure of the image header. ... The EXPORT task can easily convert an IRAF image to any of the supported formats. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/fitzpatrickm.html -- 12.2 Кб -- 03.11.2000
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1023. Footnotes
... A schema describes a C structure at run-time. ... See Section 4 for more information.. ... Germany . ... 1 ...images . ... See section ...maps . The counts are calculated using the bright edge region. See section ...annulus . These counts are calculated using the bright edge filter. ... All areas are calculated using the exposure mask...images . The bright edge filter and bright edge region describe identical areas. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/footnode.html -- 8.7 Кб -- 03.11.2000
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1024. Distributed Software for Observations in the Near Infrared
... We have developed an integrated system that performs astronomical observations in Near Infrared bands operating two-dimensional instruments at the Italian National Infrared Facility's ARNICA and LONGSP . ... The user interface is organized as widget-based X11 client. ... 1993; Di Giacomo et al. 1993). ... Moreover, if the interprocess communication interface includes support for networking, the software immediately becomes network distributed software. ... DESQview/X User Guide 1993, Quarterdeck . ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/gavryusevv.html -- 9.9 Кб -- 03.11.2000
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1025. A Method for Visualizing Time Variability in X-Ray Images
... We present a new method for visualizing flux variations in X-ray images. ... The time variability image so constructed visually shows area where strong time variation occurred. ... Figure 1. shows the intensity (left) and time variability (right) image of the ROSAT field centered on the X-ray source MKW 3. ... The corresponding time variability image is shown to the right. ... These examples clearly show the power of the method described in evidencing variable sources in crowded X-ray images. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/giommip.html -- 12.4 Кб -- 03.11.2000
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1026. Space and the Spaceball
... The vast quantities of data produced by modern radio telescopes have outstripped conventional visualization techniques available to astronomers. ... While visualization techniques in other areas find some application in astronomy, problems peculiar to the field require new techniques, such as methods for identifying three-dimensional regions. ... By presenting data three dimensionally, the astronomer may identify structure in the data which is not obvious when using conventional tools. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/goochr.html -- 14.1 Кб -- 03.11.2000
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1027. Development of an ADS Data Dictionary Standard
... We present a proposed standard for data dictionaries associated with catalogs being accessed through the Astrophysics Data System (ADS) Mosaic Catalog Service. Each catalog made available for searching must have a data dictionary, which consists of a set of specified keywords describing format, content and location of data. ... There are two keywords in the Table Data Dictionary which indicate to the server software that the corresponding column contains special attributes. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/grantc.html -- 11.3 Кб -- 03.11.2000
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1028. Representations of Celestial Coordinates in FITS
... The initial descriptions of the FITS format provided a simplified method for describing the physical coordinate values of the image pixels, but deliberately did not specify any of the detailed conventions required to convey the complexities of actual image projections. ... They were CRPIX n for the reference pixel location on pixel axis n , CRVAL n for the coordinate value at that pixel, CDELT n for the increment at that pixel in the coordinate value, and CTYPE n for the type of coordinate. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/greisene.html -- 12.3 Кб -- 03.11.2000
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1029. Automated Classification of a Large Database of Stellar Spectra
... The classification of a large database of stellar spectra, which would be a Herculean task for human classifiers if done visually, is an ideal problem for the ANN technique, which can handle such problems without manual intervention. ... We have implemented ANN to classify stellar spectra from large spectral databases. We present here the Multilayer Back Propagation Network (MBPN), which is used to classify stellar spectra obtained in the optical and ultraviolet regions. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/gulatir.html -- 13.7 Кб -- 03.11.2000
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1030. The EINSTEIN On-Line Service
... The Einstein On-Line Service (EOLS) is a simple menu-driven system which provides an intuitive method of querying over one hundred database catalogs. In addition, the EOLS contains over 30 CD-ROMs of images from the Einstein X-ray Observatory which are available for downloading. The EOLS provides all of our databases to the NASA Astrophysics Data System (ADS) and our documents which describe each table are written in the ADS format. ... The EOLS provides three options for data retrieval. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/harrisd.html -- 9.6 Кб -- 03.11.2000
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1031. Spectroscopic reduction and analysis programs at the DAO
... G. Hill . ... In this paper I outline the FORTRAN programs available at the DAO to process and synthesize spectra, loosely described under the generic name REDUCE . ... The rationale behind the various reduction and analytic software is outlined, as well as the way the programs are controlled, e.g., menu, questions and answers, keywords and values, or the cursor. ... Bevington, P. R. 1969, Data Reduction and Error Analysis for the Physical Sciences (New York, McGraw-Hill) . ... Hill, G. 1979, Publ. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/hillg.html -- 35.2 Кб -- 03.11.2000
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1032. Star Finding and PSF Determination using Image Restoration
... Next: RegisteringPSF-Matching and Up: Image Restoration and Previous: Improvements in Filter . ... First, an experimental method for locating stellar images by enhancing the sharp cores of stars using a multi-channel entropy minimization technique is described. ... A default PSF may be used to regularize the result. ... Such simultaneous PSF determination can easily be added to the PLUCY two-channel code and a preliminary example of its use on HST data is given in Hook & Lucy (1994). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/hookr.html -- 13.5 Кб -- 03.11.2000
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1033. ASpect: A Multi-Wavelength Spectrum Analysis Package for IRAF
... ASpect is spectrum analysis package being developed at ST ScI. We discuss the implementation of a GUI using the IRAF Object Manager, the ASpect task design, and the mechanics of performing a fit to a spectral feature with ASpect. ASpect is a spectrum and line analysis package being developed at ST ScI. ... For example, the fit library ``knows'' about the component and spectrum objects but a given spectrum or component object knows nothing of fitting. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/hulberts.html -- 11.2 Кб -- 03.11.2000
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1034. Data Archive System for Kiso Observatory and Okayama Astrophysical Observatory
... Okayama Astrophysical Observatory, NAOJ, Kamogata, Asakuchi, Okayama 719-02, Japan . ... A data archive system for optical CCD data produced at Kiso Observatory and Okayama Astrophysical Observatory is discussed. This system, named MOKA, allows users to search data with some constraints, preview data, and view FITS headers. ... To overcome this, we decided to develop an archive system for the CCD data available now at the Kiso Observatory (Kiso) and the Okayama Astrophysical Observatory (OAO). ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/ichikawas.html -- 8.7 Кб -- 03.11.2000
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1035. AstroWeb -- Internet Resources for Astronomers
... R. E. Jackson . ... H.-M. Adorf . ... D. C. Wells . ... AstroWeb is a World Wide Web (WWW) interface to a collection of Internet accessible resources aimed at the astronomical community. ... The goal of AstroWeb is to be the most complete, up to date, and useful listing of Internet accessible astronomical resources available anywhere. ... Jackson, Wells, and Adorf noticed that they and others had created largely overlapping lists of Astronomical resources. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jacksonr1.html -- 8.9 Кб -- 03.11.2000
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1036. Indexing and Searching Distributed Astronomical Data Archives
... The technology needed to implement a Distributed Astronomical Data Archive (DADA) is available today (e.g., Fullton 1993). Query interface standards are needed, however, before the DADA information will be discoverable. ... These parameters would be used to index each dataset in each catalog. ... The technology is available today to perform cross-catalog queries, to fetch the data at the click of a mouse, quickly to add new observation catalogs, and to distribute the load across multiple machines. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jacksonr2.html -- 11.2 Кб -- 03.11.2000
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1037. ADASS '94 - A Summary And A Look To The Future
... Next: Colophon Up: Data Modeling and Previous: Robust Estimation and . ... In considering future software needs, I present five projects to enhance the astronomer's research effectiveness, and note that large telescope projects and information databases will also challenge software developers. ... The ADASS conferences are intended to foster discussions between astronomers and software developers so that the computational needs of researchers are understood and met. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jacobyg.html -- 14.3 Кб -- 03.11.2000
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1038. Convert: Bridging the Scientific Data Format Chasm
... The Convert project is a newly funded NASA endeavor whose goal is to provide the scientific community with software tools for data format conversion. ... The goals of Convert are twofold. ... These tools will initially perform conversion of data into FITS (Wells et al. 1981), although plans to accommodate HDF (NCSA 1993a) conversion are under consideration. Secondly, Convert will allow for the inter-convertibility of data between FITS, HDF, and eventually netCDF (Unidata 1991) formats. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jenningsd.html -- 14.3 Кб -- 03.11.2000
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1039. The SAO AXAF Simulation System
... Next: Simulations of Pinhole Up: Simulation Previous: QPSIM: An IRAF/PROS . ... As part of our efforts to support the AXAF program, the SAO AXAF Mission Support Team has developed a software suite to simulate the AXAF telescope. ... We model relevant physical processes, including geometrical reflection, scattering due to surface microroughness, distortions of the optics due to the mirror mounts, attenuation through baffles, etc. ... One example of this is the program which simulates apertures. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jeriusd.html -- 14.4 Кб -- 03.11.2000
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1040. Towards a General Definition for Spectroscopic Resolution
... Judged by their instrumental profiles, spectrometers fall into two basic classes---Lorentzian and Gaussian---with many other line profile functions (sinc functions, Voigt functions, Airy functions, etc.) falling into one of these two categories in some limit. We demonstrate that the Rayleigh, Sparrow, and Houston resolution criteria are of limited use compared to the ``equivalent width'' of the line profile. ... Rayleigh criterion. ... All of these functions have continuous higher derivatives. ...
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Ссылки http://www.adass.org/adass/proceedings/adass94/jonesa.html -- 12.2 Кб -- 03.11.2000
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