... Compare obtained photon spectra with EUVE and ROSAT and XMM (work by Frank Haberl) Vadim Burwitz EPIC CAL / OPS , MPE May 4, 2006 Overview Vadim Burwitz EPIC CAL / OPS , MPE May 4, 2006 NLTE pure H model spectrum of HZ43 Different bound-free and free-free absorption coefficients -- Seaton -- Karzas Latter Vadim Burwitz EPIC CAL / OPS , MPE May 4, ...

... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

... Delivery Procedures . ... File Structure . Reference Files . ... The procedure compares two FITS reference files tables. ... The compared elements are limited to those specified in the COLUMNS parameter (which is necessary for this program to run). ... The parameter COLUMNS is an n-element array of strings with the names of the columns to compare within the table. ... When a combination is missing (in the new_file ;or in the old_file) the procedure will flag it in the standard output. ...

... Posts tagged ?parameter estimation? ... Leccardi & Molendi (2007) have a paper in A&A ( astro-ph/0705.4199 ) discussing the biases in parameter estimation when spectral fitting is confronted with low counts data. Not surprisingly, they find that the bias is higher for lower counts, for standard chisq compared to C-stat, for grouped data compared to ungrouped. ... Tags: bias , C-stat , chi-square , chisq , Cstat , Fitting , parameter estimation , Peter Freeman , spectra . ... 1 Comment . ...

System parameters on Digital UNIX . ... Digital and Cray use the number of bytes as the KIND -parameter. ... LOGICAL Default byte word KIND number = 4 1 4 LOGICAL Default double quad KIND number = 4 8 16 INTEGER int15 int31 int63 KIND number = 2 4 8 digits = 15 31 63 radix = 2 2 2 range = 4 9 18 huge = 32767 2147483647 9223372036854775807 bit_size = 16 32 64 REAL single double quad KIND number = 4 8 16 digits = 24 53 113 maxexponent = 128 1024 16384 minexponent = -125 -1021 -16381 ...

... We demonstrate through numerical simulations that model parameters estimated with our technique are essentially bias-free, even when the average number of counts per bin is 1. ... The IW technique avoids such biases by estimating through successive iterations, where for each iteration, j, , and the best-fit parameters are determined by minimization of . ... In our sample, we find that the minimum values and best-fit parameters converge after about 6 iterations. ...

The numerical code for the revised (de Vaucouleurs) morphological type is defined in RC2. The correspondance with the Hubble type is: . The morphological type is also coded as the Hubble type: type , and other information about the morphology are contained in the bar and ring parameters and to some extend in the compactness and multiple parameters. This parameter is derived from the compilation of morphological description . ... HyperLeda . ...

... 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. ...

Spectropolarimetry and modeling of Galactic Wolf-Rayet star WR156 O LGA M A RY E VA Special Astrophysical Observatory RAS; olga.maryeva@gmail.com For the first time spectropolarimetric observations of Wolf-Rayet star WR156 (WN8h sub-class) were conducted. ... This polarization is, most probably, has an interstellar origin, as its magnitude and orientation are similar to the ones of field stars. ... By its parameters WR156 is similar to other WN8h stars, displaying the line effect. ...

Next: Absolute visual magnitudes Up: Command line procedures Previous: Plot data from the Contents . Files containing stellar parameter data reside in oyster/starbase . Extensive photometric data is found in files spec_par.X , where X signifies the luminosity classes for dwarfs, giants, and supergiants, V, III, Iab , respectively. For subgiants, brightgiants, and the subclasses of the supergiants, limited data is in files spec_MV.IV , spec_MV.II , spec_MV.Ia , spec_MV.Iab , spec_MV.Ib . ...

... Basic Observables: Zero-differenced phase and code ionosphere-free combinations of global GNSS network stations, corrected by P1-C1 satellite code biases (cc2noncc), daily observations with 30 seconds sampling rate Sites coordinates : IGb08 reference frame coordinates and velocities Displacements: solid tides, ocean loading, pole tide loading (IERS 2010) Geometric model : Receivers antennas eccentricities, absolute receiver and ...

The problem of solar wind data correlation for the observations onboard several spacecraft is very important for three points of view: . ... This problem is studied now in detail by systematic determination of ion flux and ion velocity data correlations by INTERBALL-1 (IKI group), WIND and IMP 8 (both - MIT group). ... Solar wind plasma correlation lengths from IMP 8, WIND and INTERBALL-1. ... Correlation of solar wind observations onboard several spacecraft: INTERBALL-1, IMP 8 and WIND data. ...

These routines are meant to supplement the standard C library str* routines Since each version of Unix has a different set of "extra" string functions, this package is meant to bridge the gap, and provides some of the more useful "extras". ... Perform a quicksort on an array of strings. flag st_expr_expand (char *output, unsigned int length, CONST char *input, CONST char *(*get_variable) (CONST char *variable, void *info), void *info, FILE *errfp) . ... Parameters: . ... Multithreading Level: Unsafe . ...

... First, we computed the mean errors of orbit parameters on the assumption of the linear connection of them with observation errors and then we compared obtained estimates with those resulting from the assumption of the nonlinearity of this connection. Secondly, we correlate orbital parameters and their errors obtained by the method of the least modulus with those obtained by the least-squares method. ...

Turret scans move the turret back and forth in a sine wave while the dome moves +/- 5 arc minutes. ... There is also no side lobe or coma fit (coma could be added but side lobes would be difficult). ... The calibration scans fit for sidelobes and coma while the turret scans just fit for the main beam. ... The alignment error could be because the calibration and turret scans do different za motions (but i'm a little suspicious). ... The calib beam width is 10% smaller than the turret scan beam width. ...

... I determine th as a time period (from some moment in the past till the present moment) during which papers responsible for 1/2 of the total citation index were published. Parameter Nt represents averaging of the citation index over this period: Nt = C.I./2th 1 Intro duction The problem of estimation of an impact of a scientist (or a group of them) is an actual one (see, for example, [1] and references therein). ... One published in 1965 a paper with C.I.=5000, and nothing after that. ...

... Russian Foundation for Basic Research , Project number 98-02-17366 . ... A number of experiments proposes the d -type of the wave function, having two directions with positive and two (in orthogonal direction) - with negative sign of the order parameter. ... The effect of the wave function phase is most efficiently revealed in the experiments with Josephson structures, that are used for determination of the dependences on the pulse direction. ... The project goals are: . ...

THE PARAMETERS INVOLVED IN HAPKE'S MODEL FOR ESTIMATION OF THE COMPOSITION OF THE EJECTA LUNAR TERRAINS. ... In the previous papers we were estimated the surface roughness of the ejecta lunar terrains by means comparison of the local phase function and the average integrated lunar indicatrix. ... The Hapke's theoretical model of the lunar surface reflection. ... For THE PARAMETERS INVOLVED IN HAPKE'S MODEL: S.G. Pugacheva, V.V. Shevchenko a low-albedo lunar surface parameter Bo = 1. ...

... Using the uvby -photometry and proper motion data for about 5500 F stars within 80 pc from the Sun, we have studied velocity ellipsoid parameters and obtained the following results. 1) The sizw of all wllipsoid semiaxes increase systematically for groups of stars with the decrease of both temperature (at constant metallicity) and metallicity (at constant temperature). ... As a result, each of the three parameters - temperature, metallicity and velocity dispersion - is an age indicator. ...

... In recent years, substantial information concerning the Io torus has been published. ... Explaining the observed steady state rotation of the torus seems to be difficult. The angular velocity of the torus must be in accordance with the celestial mechanics laws, of the same orders as Io's one. ... We wish to straighten out the situation describing the main geometric and kinematic features of the Io torus using a steady state model based on some of Alfven's ideas [Alfven, 1981]. ...