... NB The next 2 columns will only be present if the parameter usecat has been set to true . ... QUALITY FLAGS Each source has an associated ``quality flag''. ... 0 1 Source lies above one or more bad pixels . ... 6 64 Source lies near to another bright source . ... For example, a source with a bad pixel and lying on or close to a read-out streak would have bits 0 and 1 set and thus have a quality flag of 3. QFLAG The quality flag for each source in each filter obtained from the input source-lists. ...

... How do I find the correct reference Transfer Function for the analysis of my double star Transfer Function? ... Data . ... HST Overview . ... Data Analysis . ... A: All available reference Transfer Functions are available from the FGS Transfer Mode Calibration Products page. The calibration reference file used should represent an observation taken through the same filter as the observed Transfer Function. ... Data taken after day 352 of 1993 should NOT use any reference files before that date. ...

Next: Methods for Structuring and Searching Very Large Catalogs . ... We have explored two automated classification methods: supervised classification using Artificial Neural Networks (ANN) and unsupervised classification using Self Organized Maps (SOM). These methods are used to classify IUE low-dispersion spectra of normal stars with spectral types ranging from O3 to G5. This paper describes the application of automated methods to the problem of the classification of stellar spectra. ...

Sherpa Aneta Siemiginowska 1 SHERPA CIAO's Modeling and Fitting Application Aneta Siemiginowska CXC Astrostatistics Workshop, HEAD meeting , New Orleans, Septemter 2004 Sherpa Aneta Siemiginowska 2 Modeling and Fitting Software XSPEC - analysis of 1D X-ray data (imaging + grating) ISIS and Pint of Ale- primarily for analysis of highresolution (ie grating) X-ray data ... Jointmode data: spatialspectral, spatialtiming Use scripts based on Sherpa only commands. ...

... Automated Spectral Classification Using Neural Networks E. F. Vieira Laboratorio de AstrofТРsica Espacial y FТРsica Fundamental P.O.Box 50727, 28080 Madrid, Spain, Email: efv@lae#.esa.es J. D. Ponz GSED/ESA, Villafranca P.O.Box 50727, 28080 Madrid, Spain, Email: jdp@vilspa.esa.es Abstract. We have explored two automated classification methods: supervised classification using Artificial Neural Networks (ANN) and unн supervised classification using Self Organized Maps (SOM). ...

... CALIBRATE/LINE Calculate coefficients for wavelength calibration . CENTER/.. Compute center of line . CONVERT/TABLE Make image from table values . EXTINCTION/SPECTRUM Correct 1-D image for extinction . IDENTIFY/GCURSOR Identify table entries from graphic display . IDENTIFY/LINE Equate X positions to wavelengths . INTEGRATE/GCURSOR Integrate line interactively . MODIFY/GCURSOR Change data in line interactively . ... SEARCH/LINE Search calibration lines . ...

Next: Displaying Spectral Cubes Up: Image Analysis Previous: Polarimetric Analysis Tasks . The task imdiff can be used to compare two images. ... You can use the self-explanatory task shifty for large integral pixel shifts. ... It may be that you would like the image to be written out with histogram equalisation applied, rather than it just being computed but not saved by the display task. ... Next: Displaying Spectral Cubes Up: Image Analysis Previous: Polarimetric Analysis Tasks Miriad manager . ...

The computed band passes. ... The interim correlator input is filtered by 8 analog filters (50 Mhz wide at the 260 Mhz IF... one for each sub correlator). ... For bandwidths of 25 Mhz and below the real data stream is digitally down converted to complex samples I, Q streams. ... The Top figure is the halfband filter bandpass computed from the filter coefficients. ... The computed filter has aliased power, extra IQ filtering, and two applications of the filter on the resulting real bandpass. ...

... Take a particularly simple signal: a cosine wave. ... Now, we are going to stretch and shrink the wavelet along the time axis (we assume the data is in the time domain), and at each time compare the shape of the signal to that of the wavelet. ... Figure 3: The wavelet (dotted line) is translated rela tive to the signal (solid line). ... Figure 4: The dashed line plots the `match' between the wavelets (dotted line) and the signal (solid line) as a function of time. ...

... The sample of the Local Volume galaxies (distance smaller than 10 Mpc) gives a unique opportunity to study the properties of galaxies including the weakest objects: the absolute magnitude M B -10 and the virial mass M vir 10 9 M x263C;. ... Luminosity function of the Local Volume galaxies. ... The luminosity functions for galaxies are presented: red dashed line - from the 2dFGRS survey (Norberg et al. 2002); blue dash-dotted line - from the SDSS survey (Blanton et al. ...

... Bojan Nikolic web pages (r. 329) . ... Analysis of (radio) spectra . The RNested package is a re-implementation of the main algorithms from the radiospec package into the R statistical data analysis environment. ... packages ( "RNested" , repos = c ( "http://www.mrao.cam.ac.uk/~bn204/soft/R" , "http://cran.us.r-project.org" )) . ... RNested ? Nested Sampling in R & analysis of spectra . ... Copyright 2005 -- 2016, Bojan Nikolic feedback welcome ...

case is a flow control construct that provides for multi-way branching based on patterns. ... This word is compared with each pattern in order until a match is found, at which point the associated command ( s ) are executed. case word in pattern1 ) command(s) ;; pattern2 ) command(s) ;; patternN ) command(s) ;; esac . When all the commands are executed control is passed to the first statement after the esac . ... A command can be associated with more than one pattern. ...

... 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! ...

... Mass . 17a. Measuring Mass . ... A medium-size (1.25 inch wide) binder clip, as is used in offices to hold papers together--the type made of flat blue steel, with two wire handles. ... The theory predicts that the oscillation period should be proportional to the square root of the oscillating mass, including the mass of the clip. Note that gravity plays no part here: the oscillation period would be the same on the Moon or in zero-g. Denoting square root by SQRT, we have . ...

Please enter the lightcurve file name and period search parameters: . Lightcurve file: . ... Apply the Heliocentric correction and convert all dates to Terrestrial Time (TT)? ... Also, the Heliocentric correction cannot be applied to such lightcurves. ... This period search service is also available at the mirror sites: Mirror 1 , Mirror 2 , Mirror 3 , Mirror 4 . You may download the latest source code distribution and install the period search service at your own web server. ...

We have designed the laboratory model of static Fourier spectrometer for onboard usage for spectral study of atmosphere and ionosphere. The gain of model is to simulate onboard FS which will not have any moving elements (all its optical elements will be mounted at fused quartz monolithic construction), to compare experimental results with theoretical estimations and to measure MTF of CCD array. ... This fact connected with low frequency response of CCD array due to small format of it. ...

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The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . Directory of astronomy web sites. ... Listed Since October 25, 2004 . ... Web Site . http://123world.com/astronomy/index.html . ... Web . www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

... Phi Persei: Double Star . ... Based on recent results, this artist's vision of the double star Phi Persei, 720 light years away, shows a bright, rapidly rotating massive star surrounded by a disk of gas. ... New Stars In 30 Doradus . ... Massive Stars Of 30 Doradus . ... Gas and dust clouds in 30 Doradus, also known as the Tarantula Nebula, have been sculpted into elongated shapes by powerful winds and ultraviolet radiation from these hot cluster stars. ... Our Galaxy in Stars, Gas, and Dust . ...

... We describe here all plotting and editing procedures. For calibrated visibility data, as well as other data from e.g. astrometry, the user will select plotting menus from the so-called AMOEBA (lower) section of the main GUI. While AMOEBA is described later on in a dedicated part of this manual, it is the general data analysis (as compared to reduction ) facility of . ... INTERFEROMETRY Plot visibility data . ... Each of the above buttons will display a widget designed for this class of plot. ...