[PDF] Automatic Classification Of Spectra From The Infrared Astronomical Satellite Iras eBook

Author :
Publisher :
Page : 1992 pages
File Size : 38,66 MB
Release : 1989
Category : Infrared astronomy
ISBN :

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"The document is intended to be an interim reference document for astronomers who are studying infrared sources" ... Intro.

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 594 pages
File Size : 33,37 MB
Release : 2018-07-23
Category :
ISBN : 9781723530883

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A new classification of Infrared spectra collected by the Infrared Astronomical Satellite (IRAS) is presented. The spectral classes were discovered automatically by a program called Auto Class 2. This program is a method for discovering (inducing) classes from a data base, utilizing a Bayesian probability approach. These classes can be used to give insight into the patterns that occur in the particular domain, in this case, infrared astronomical spectroscopy. The classified spectra are the entire Low Resolution Spectra (LRS) Atlas of 5,425 sources. There are seventy-seven classes in this classification and these in turn were meta-classified to produce nine meta-classes. The classification is presented as spectral plots, IRAS color-color plots, galactic distribution plots and class commentaries. Cross-reference tables, listing the sources by IRAS name and by Auto Class class, are also given. These classes show some of the well known classes, such as the black-body class, and silicate emission classes, but many other classes were unsuspected, while others show important subtle differences within the well known classes. Cheeseman, Peter and Stutz, John and Self, Matthew and Taylor, William and Goebel, John and Volk, Kevin and Walker, Helen Ames Research Center NASA-RP-1217, NAS 1.61:1217 ...

Author : M.A Albrecht
Publisher : Springer Science & Business Media
Page : 284 pages
File Size : 20,52 MB
Release : 2012-12-06
Category : Science
ISBN : 940113250X

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Data archiving has, for many years, been the most disregarded aspect of all data systems. The increase in numbers of telescopes, both groundbased and space-borne, and the increase in efficiency of detectors have generated overwhelming amounts of data. Much of these data were and are not used on short timescales and (should) have been archived, where they can be used later and/or by others. Archiving is essential. Objects can change in the course of time. New technological or scientific developments might require observing objects again. The cost-benefit ratio will become more and more important when considering the allocation of telescope time. The retrieval of `old' data can then be crucial. At present there are a number of data collections and data retrieval systems. This book includes a series of clear and up-to-date descriptions of many important available data systems. For professional astronomers, librarians and computer engineers.

Author : F. Garzón
Publisher : Springer Science & Business Media
Page : 264 pages
File Size : 19,90 MB
Release : 2012-12-06
Category : Science
ISBN : 9401157847

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After a year's successful operation, the European DENIS project is now a scientific reality and its close cousin 2MASS (USA) is about to come into operation. The observational and data reduction processes of both DENIS and 2MASS are fully described in this volume. Already the impact of DENIS is making itself felt in the astronomical community in areas of research as diverse as cosmology, the evolution of galaxies, the interstellar medium, the search for brown dwarfs, and stellar structure and evolution. The first routine results from DENIS and the preliminary results from the 2MASS prototype camera are discussed and compared with other surveys across the wavelength spectrum, both space- and ground-based, including the Digitized Sky Survey, ISO and ROSAT.