... With the advent of RDF, the output from qpspec (for most instruments) has been divided into three tables: . ... source off-axis histogram . ... Tasks downspecrdf , and upspecrdf translate between RDF and pre-RDF formats. upspecrdf will be useful to re-analyze previously extracted spectral data; downspecrdf is currently necessary for use with proscon (version 2.2), the translation program for input into xspec, which does not work with RDF data. input files: rp90_obs.tab, rp90_soh.tab, rp90_boh.tab . ...

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Below are 3 sub-tables showing the SDSS/2MASS photometry, position, and spectral type of objects as reported in Hawley et. al 2002. ... Column 4: r. The object's r magnitude as measured in SDSS imaging. (a negative magnitude in any filter indicates no measurement in that filter) Column 5: i. The object's i magnitude as measured in SDSS imaging. ... Column 7: J. The object's J magnitude as obtained from the 2MASS second incremental release point source catalog. ... Column 10: Spectral type. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2001 May 30 . Stellar Spectral Types: OBAFGKM . ... Explanation: Astronomers divide stars into different spectral types . ... The seven main spectral types OBAFGKM are shown above with the spectrum of a single "O" star at the top followed by two spectra each from the progressively cooler designations, respectively. ... About APOD | ...

... Credit: KPNO 0.9-m Telescope , AURA , NOAO , NSF Explanation: Astronomers divide stars into different spectral types . ... A few types that best describe the temperature of the star remain in use today. The seven main spectral types OBAFGKM are shown above with the spectrum of a single "O" star at the top followed by two spectra each from the progressively cooler designations, respectively. ... Publications with keywords: stars - spectrum . Publications with words: stars - spectrum . ...

Next: The main observational parameters Up: Spectral survey of Case Previous: CCD observations and data . ... We divided the presentation of the observed galaxies into the two main groups. In Tables 2 and 3 we give some general parameters, line intensities and equivalent widths for 142 galaxies with the detected emission lines. We summarize data in Table 4 for the rest 44 galaxies where we have not detected emission lines (in the blue part of the spectrum). ... Quasar CG 273 . ...

Spectral jumps were seen in data taken back in 18mar08 . That data had the rms fixed at 15 and changed pshift as well as fixing pshift and changing the rms. ... Take 6 sets of data. At each set, take data with fftlens = 8192,4096,2048,1024, and 512. fftlengths with even, odd number of butterfly stages will have rms voltage levels that differ by sqrt(2) (since the butterfly down shift changes voltage by factor of 2 and it takes 2 butterfly stages to increase the rms by a factor of 2). ... rms . ...

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. ...

... BOM2 and the basic block of solar limbograph including pointing and control systems ? ... Fine tracking platform (FTP) for Sun tracking by the sight axis of the limbograph; . ... Tracking system frequency ? ... Controller of the control system and solar fine tracking of the sight axis of the limbograph; . ... The basic relative construction of the elements and instrumental blocks of the "Astrometria" space experiment is shown on the block diagram of units within the complex of SL-200 solar...

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Next: C.S. Jeffery, Research Astronomer Up: Research Previous: J.E. Chambers, Research Astronomer Contents . ... We examine spectral time-series of two lower-chromospheric lines observed with SUMER/SOHO (N I and C II ). ... Two examples of explosive events observed with SUMER/SOHO in transition region spectral lines are reported here; one detected in C IV 1548?, in a region within the northern polar coronal hole, and the other in O VI 1032?, in an active region. ...

Next: Selection and Multi-Source/Multi-Frequency Datasets Up: Visibility Data Concepts Previous: Selecting UV Data in . A Miriad visibility dataset can contain simultaneous observations at multiple spectral bands, or spectral windows. ... When there are multiple spectral windows, channels are still numbered from 1 to N , where channel 1 is the first channel of the first spectral window, and channel N is the last channel of the last spectral window. ... line=channel,1 . ...

The Arcetri Spectral Code consists of a database of atomic data and transition probabilities that allows the calculation of synthetic spectra of optically thin plasmas. ... Other data : A few more transitions come from the old version of the Arcetri Spectral Code (Landi Landini 1998, A , 133, 411), and are calculated using the coronal model approximation . ... A complete description of the Arcetri Code can be found in Landi Landini 2002, A , 384, 1124 . ... Page created and maintained by Enrico Landi. ...

... Thomson's multiple window method of spectral estimationthomson provides a very good estimate of the power spectrum by measuring the energy contained within a collection of rectangular shaped frequency intervals. ... Often, much of the fine structure of a spectral estimate is due to noise. It should be stressed that while other methods of spectral estimation (such as the Welchoppenheim method) exist, the Thomson method is particularly noteworthy for its precisely defined rectangular frequency bins. ...

... Spectral extraction is implemented in the task omgrism , which runs over all sources in the source list (created by omdetect ), cross-identifies the zero- and first-order spectra and decides which of them are usable for extraction. ... Omgrism allows spectral extraction using three possible algorithms: simple summing of counts above background in the cross-dispersion direction; one-dimensional Gaussian fit; and Optimal Extraction (Horne's algorithm [ 2 ]). ...

... Подставки под телевизоры и Hi-Fi . ... Теплая детская шапка-бини Reima Auva идеально подойдет для прогулок в прохладное время года. ... Современный дизайн и расцветка делают эту шапку модным и стильным предметом детского гардероба. ... Цвет: разноцветный . Коллекция: Весна-лето 2016 . ... Пол: Мужской . ... Цвет: мультиколор. ... Сезон: Весна-лето 2016. ... Цвет: черный . ... Цвет: белый . ... Пол: Женский . ... Цвет: синий . ... Barkan 34.C.B 4D кронштейн - Barkan - Barkan . ...

... December 21, 1997 . ... Advantages are briefly discussed of gaining in spectral resolution, which is accompanied by losses in signal level, as compared with the attempts to improve the accuracy of measurement of line parameters by means of rising the S/N ratio alone with increasing the exposure time. To partially solve the problem of observations of faint objects at the BTA a new design echelle spectrometer is proposed. high resolution spectroscopy . ...

... Three or four lectures on isoperimetric inequalities in infinite groups (October) . ... Nash inequalities are useful tools to estimate the rate of decay of return probabilities in term of the spectral geometry of the space (isospectral profile). ... The isospectral profile can be estimate with purely geometric tools: isoperimetric inequalities and Folner couples. 3) Isoperimetric inequalities. ... The Erchler-Gromov isoperimetric inequality for wreath products is an entropic inequality. ...

... Plasma sheet is the region of closed field lines in the equatorial magnetotail (however, see also plasmoids ). Plasma sheet is typically divided into plasma sheet proper, or central plasma sheet , and plasma sheet boundary layer (PSBL) , the latter being at higher latitudes adjacent to the tail lobes. ... This is evident both in storms time ring current and substorm time plasma sheet (including late growth and the expansion phases; see, e.g., Daglis et al., ... Res., ... J. Geophys. ...

... 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). ...