... INTRODUCTIO N Th e discovery of a strong variable surface magnetic field CrB, HD 126515 and 53 Cam (B ) in four Ap stars: HD 215441, (Preston, 1969a; Wolff and Wolff, 1970; Preston, 1970; Huchra, 1972) changed our knowledge about magnetic field geometry, formerly based only on effective field measurements (B ) . ... In this paper we present some results of an investigation of the variation with the rotation of the surface magnetic field for the Ap star 78 Vir using the curve of growth method. ...

... Correcting ETC Calculations of CCD Spectral Observations for CTE Effects . ... HST Overview . Overview . ... Post-Observation . ... ETC . ... ID: CL Script for Applying CTE Loss to Output of Spectroscopic ETC . ... However, the STIS ETC calculations do not incorporate these CTE effects as yet. ... The output from this script should then be used to calculate the appropriate input flux level for a second run of the ETC, which will then yield output which is corrected for the CTE effect. ...

Next: Concluding Remarks and Future Up: Evolution of the Double Previous: Effect of sources evolution . Our calculations show that if GRB indeed are due to binary neutron star coalescence,   they can potentially constrain the cosmological parameters as well as the early star formation history. ... 1994)).[ ... If the cosmological origin of GRB is confirmed, the - and test could be used independently to estimating the cosmological parameters and tracing star formation history in galaxies. ...

... Column 1 gives the object name from the Case or Markarian catalogs. ... For Markarian galaxies the errors of coordinates usually lie inside 2'' (Lipovetsky [ 1983 ]). Column 4 gives the eye-estimated apparent blue magnitudes according to the same sources. ... Other names of a galaxy we give in column 7. ... In column 3 we cite the original emission-line code of the galaxy for the strength of [O III ] doublet according to the Case catalog (s - strong, m - medium, w - weak). ...

XMM-Newton CCF Release Note XMM-CCF-REL-314 The RGS effective area: up date of the contamination correction R. Gonzґlez-Riestra a April 11, 2014 1 CCF comp onents Name of CCF RGS1 EFFAREACORR 0009 RGS2 EFFAREACORR 0009 VALDATE 2001-01-01T00:00:00 2001-01-01T00:00:00 List of Blocks changed EFFAREACORR EFFAREACORR XSCS flag NO NO 2 Changes A correction to the RGS effective area for contamination on the detectors was first implemented in SAS in 2007 [1]. ...

... 13, Moscow 119992, Russian Federation, e-mail: busarev@sai.msu.ru; 2 Research Institute Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea 334413, Ukraine, e-mail: prok@crao.crimea.ua Summary: We propose a combined method of astronomical investigations of small or distant planets incorporating registration of a set of integral spectra of an object and their frequency analysis. ... An application of the method is shown on example of asteroid 21 Lutetia. ... 6] Busarev V. V. (2002), Solar Sys. ...

... 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. ...

To main of Laboratory . The research work and design of optical and optical-electronic devices are carries out by laboratory staff: . ... Lens: . ... In the layout 1 prism systems perform functions of dispersive element, corrector of aberrations, optical reducer. ... Spectral range 200 - 400 nm; . ... Back Forward . ... The main corrector's function are compensation of field aberrations of the main spherical mirror of a telescope (diameter of 600 mm, f'=1200 mm) and increase aperture ratio. ...

... Green and blue curves - CYGAM telescope (squares - no constraints on the angle a , triangles - a <0.5 0 ); red curve - EGRET telescope. Effective area versus photon incidence angle to relative the longitudinal telescope axis (squares - no constraints on the angle a , triangles - a <0.5 0 , spectral index g= 2). ... Angular resolution for normal to the axis X incidence versus source power law spectrum index (squares- no constraints on the angle a , triangles- a <0,5 0 ). ... CYGAM (PDF, 450 Kb) . ...

... Variation of systematic errors for USNO A2 (in mas per year) 23 .914 0.082 0.250 0.418 0.586 0.753 0.921 1.089 1.257 1.425 1.593 4 4. 3. 3. 3. 3. 3. 3. 3. 3. 3. 15 ± 7± 1± 3± 3± 10 ± 10 ± 11 ± 6± 10 ± 12 ± and their errors USNO UCAC USNO UCAC A2.0 2 3 B1.0 4 (1998) (2006) (2003) (2012) 37 27 11 4 732 529 778 501 050 078 775 387 (34 610 829) (17 209 447) (9 744 401) () Distribution of observations ( ...

... The Search of a pulsar Once the dedispersed time series is obtained, a Fourier transformation is performed. ... 2 Binary parameters The orbit of a pulsar , as well as any object, in a binary system is determined in its geometrical characteristics, space displacement and syncronised in time by the following parameters : Semimajor axis Eccentricity Longitude of periastron Binary period Time of ascending node a e PB T0 True spin period and observed spin period The ...

... The Earth orientation parameters UT1 and polar motion (x pol ; y pol ) are relat­ ed with the values of UT0 and VOL obtained from the LLR analysis for a station with geocentric longitude and latitude (–; OE) by the following expression: 7 UT0 \Gamma UTC = UT1 \Gamma UTC + (x pol sin – + y pol cos –) tan OE 15 V OL = x pol cos – \Gamma y pol sin – At least four normal points for each station--reflector pair at one day were accepted for the diurnal UT0 estimations. ...

IBIS Data Analysis . ... IBIS . ... Flat Fielding - Introduction . The images obtained by IBIS will have intensity variations across the field of view that are not due to the solar image, but rather caused by instrumental effects that alter the observed intensity in each point of the field of view. ... IBIS Flat Fielding Techniques . ... Therefore, it is desirable to obtain the flat field measurements center on a point along the equator near the heliographic center of the solar disk. ...

Stellar Spectra Classification Exercise Introduction This activity allows you to introduce the classification of stellar spectra from a few different perspectives. ... They cover historical background, how we obtain spectra, classification schemes, examples, activities and questions. ... 1x10-10m. Types of spectra: |Type of spectrum |Photographic example | Continuous (or continuum)|[pic] | ... Wien's Law and Blackbody Curves The behaviour of most stars approximates that of black body radiators. ...

... As a result of BTA observations of 23 chemically peculiar stars with strong magnetic fields, it was found that in 22 of them the longitudinal magnetic field, measured from the hydrogen line cores are considerably lower (by about 1/3) than the value measured from metal lines in the same spectra. ... New approaches need to be developed in order to interpret the data. ... The Zeeman spectrum of a star with a strong magnetic field, 53 Cam. ...

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

... Contact A Problem of an estimation of accuracy of the asteroid CCD observations . The Minor Planet Center supported by the Interntional Astronomical Union is the main office for keeping observational data of the small Solar System bodies and their investigations. ... At Pulkovo Observatory we are estimating an accuracy of the CCD asteroid observations obtained by amateurs and professional astronomers all over the World using the MPC database. ...

Natural Satellites Service. ... Mutual occultations and eclipses . of the major satellites of Uranus . ... We present the ephemerides and circumstances of the mutual occultations and eclipses of the major Uranian satellites in 2006-2010. ... In 2006-2010 about 190 mutual occultations and eclipses will occur. ... The ephemerides of the mutual occultations and eclipses of the major satellites of Uranus in 2006-2010 are presented in four tables according to four periods of visibility of Uranus. ...

... The basic principles of incoherent scatter: . ... Because of the electron movement, spectrum of the observed signal is broad and it has shape which depends, e.g., on the temperature. ... ion temperature . ... According to the theory, Ti should be replaced by (2Ti,perp + Ti,par)/3 (Williams and Jain,1986; Glatthor and Hernandez, 1990; Winser et al., 1990). ... Glatthor, N., and R. Hernandez, Temperature anisotropy of drifting ions in the auroral F-region, observed by EISCAT, J. atmos. terr. ...

... Normalised spectra of all central stars of planetary nebulae observed in the 075.D-0289 campaign ordered by increasing effective temperature from top to the bottom. ... The presence of a magnetic field in the central star may be the reason for this lack of symmetry, but observational works published in the literature have so far reported contradictory results. ... We determine the magnetic field from spectropolarimetric observations of ten central stars of planetary nebulae. ... Results. ...