... Bojan Nikolic web pages (r. 329) . ... Using high-resolution three-dimensional realisations of turbulent fields, we investigate the limits on achievable performance of atmospheric phase correction using water-vapour radiometers arising from following effects: the incoherent measurement of power from water by the radiometers (in contrast to coherent detection of the astronomical signal); the different tapers of the response patterns of the astronomical and radiometer receivers; and, the ...

An OH survey for Post-Asymptotic Giant Branch stars P. te Lintel Hekkert, J.M. Chapman We present a survey for OH maser emission at 18 cm in the direction of 196 IRAS point sources. ... OH emission and/or absorption was detected in the direction of 77 sources of which 61 OH detections were previously unknown, giving an overall detection rate of 39 per cent. ... These included three \pn\ (two new OH detections), nine \ppn\ (three new OH detections) and two cold OH/IR stars (both previously known). ...

... These sources are known from a previous study to be associated with dense gas and dust, and not associated with HII regions. All 11 sources were detected in HCO+, 9 in mm-continuum and 5 (out of 8 observed) in cm-continuum. The derived physical parameters confirm the high mass nature of these molecular clumps and suggest they are gravitationally bound. Molecular outflows were detected toward 6 sources, with flow masses and momenta much higher than in low-mass Young Stellar Objects (YSOs). ...

... An interactive IRAF task for the analysis of Extreme Ultraviolet Explorer ( EUVE ) emission line spectra is presented. The line flux in extracted spectra may be measured by multiple techniques, including fitting individual lines. ... To aid in identifying lines, the positions of known lines may be marked on the spectrum during the fitting process. Also, model EUVE spectra may be constructed and overlaid using plasma emissivities and source emission measures supplied by the user. ...

... The second step is to inspect the data, to define a set of criteria to select the science frames and their associated calibration frames, and to use the MIDAS Data Organizer to do the selection and to create the Association Table. ... Table: Example of an Association Table . ... For example, one can require that in the calibration process of frame susi0099.bdf the master bias susi_124_125.bdf is to be used, i.e. the bias frames associated with the science frames susi0097.bdf and susi0098.bdf . ...

Next: Accretion Disks with Up: StarsStellar Populations, Previous: Spectroscopic Analysis of . ... We present and discuss spatially resolved spectra of the accretion disk and the gas stream region as a function of distance from disk center, the spectrum of the uneclipsed light, and the radial temperature distribution in the ultraviolet. Keywords: Accretion disks, Cataclysmic variables . ... In this paper we report on the HST spectral mapping of the nova-like UX UMa. ...

... Early studies of PMS stars focused on T associations, especially Taurus-Auriga. However, one might expect low mass star formation to be different in OB associations. ... He identified Orion OB1a as the stars northwest of the belt. Orion OB1b is composed of the stars near the belt, including the belt stars and Orionis. ... He finds no perceptible distance change within the Orion OB1b association and finds the distance modulus to be 7.8 and 7.9 for Orion OB1a and OB1b respectively. ...

... Image Quality of the VLT . Total Optical Control . First light for the ESO VLT unit telescope 1 occurred during the workshop. ... The image shown (Figure 1 ) here was obtained with the VLT on May 16, 1998, in red light (R band), i.e. while the mirror was still uncoated. ... In this diagram (FIgure 2), the measured image quality of the VLT UT1 astronomical images is plotted versus the ``seeing", as measured by the Seeing Monitor, a small telescope also located on top of the Paranal Mountain. ...

Next: Observations and Data Reduction Up: Coronal Hole Diagnostics out Previous: Coronal Hole Diagnostics out . ... Line width variations combined with simultaneous electron density estimates, provides a very powerful diagnostic for the solar corona. ... They find that for distances of a few arc seconds outside the solar limb, the average line of sight electron densities in the coronal holes are about a factor of 2 lower than in quiet sun regions. ... The Western limb data showed a similar trend. ...

... Space Telescope Science Institute , Baltimore, MD, USA ( ESA Associate Astronomer: 1997 - 2003) . Astrofisica , Dipartimento di Fisica , II Universit di Roma "Tor Vergata" , Italy (Assistant Professor: 1992-1997; on leave 1997-2001) . European Southern Observatory , Garching bei Munchen, Germany (Post-doctoral Fellow: 1990-1992) . Space Telescope Science Institute , Baltimore, MD, USA (Post-doctoral Fellow: 1987-1990) . ...

... Future seminars . P a s t seminars . ... Stochastic Particle Acceleration and the Problem of Background Plasma Overheating " . D.O. Chernyshov and V.A. Dogiel (P.N.Lebedev Institute of Physics) . ... It was concluded also from these investigations that it is problematic to produce emitting electrons from a background plasma by stochastic (Fermi) acceleration because the energy supplied by external sources in the form of Fermi acceleration is quickly absorbed by background plasma. ...

Proposal Identification No.: A2766 Arecibo Observatory Date Received: 2014-Sep-02 18:08:01 William E. Gordon Telescope Observing Time Request COVER SHEET Section I - General Information Submitted for Sep 1 2014. ... To delineate the physical model of this complicated starburst system further, we are supplementing this Arecibo monitoring by milliarcsecond-resolution HSA (VLBI) line and continuum imaging at quasi-yearly intervals (with Arecibo in the array). ...

... This CCF contains the following five extensions: ADUCOEFF , OFFSET_GAIN , GAIN-HIGH , REEMISSION and REEMISSION1 . ... Code of the bad pixel table (BPT) version, which includes the additional column offset values, described in the OFFSET_GAIN extension. ... GAIN : . ... Vector column of length 64; one gain value per node per chip. ... Vector column of length 64; one offset value per node per chip. ... Vector column of length 64; constant in linear offset value calculation (only present for ALGOID =1...

Main Program Travel Where to go in Moscow Information . ... Conference Program . ... See also abstracts of the Talks and Posters . ... January 15 th : Call for abstracts . February 15 th : Deadline for abstract submission . March 15 th : Release of preliminary scientific program . March 15 th : Deadline for submission of information for visa support . ... International Conference: Cosmology and High Energy Astrophysics (Zeldovich-90) 20-24 Dec 2004, Moscow, Russia . Conference E-mail . ...

Authors: Yu.G. Shevelev , V.A. Marsakov , . ... Based on a previously compiled catalog of fundamental astrophusical parameters for nearby disk F stars (containing, in particular, metallicity, isochronal ages, and space-velocity components), with were derived from published astrometric data, the Galactic orbital elements were calculated for 1630 stars. ... The radial and vertical metallicity gradients were found for mixed-age stars and for a few narrow age ranges. ...

2007 Jan 08) Bright comet C/2006 P1 (McNaught) . 2005 Jan 20) Tornado near Coonabarabran . 2005 Jan 16) Major upgrade in progress . 2005 Jan 16) Near Earth Comet 162P/Siding Spring . 2004 Apr) 2004 CB identified as a comet . 2004 Apr) Systematic surveying commenced 2004 March 16 . 2004 Apr) Media Releases on commencement of survey . 2004 Jan) 'Accidental' discovery of 2003 XB22 . ... Siding Spring Survey Main Page . ... Previous News Items . ...

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... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

Next: Introduction Up: No Title Previous: No Title . The Giant Silence of the Universe or the absence of ``Space Miracles'' is in an obvious contradiction with the fast evolution of our civilization. The most striking is the fact that both these phenomena, taken separately, are in crying contradiction with ``materialistic common sense'' and are to be considered as real Space Miracle themselves. ... Lipunov V.M. Sun May 3 16:35:20 MSD 1998 ...

ABSTRACT: Both previous radiomessages for aliens, Arecibo 1974 and Evpatoria 1999 (see http://ebe.allwebco.com/Science for details) were the logical ones and represented the binary stream of FM information, which should be arranged into two-dimensional forms to perceive by eye-like sense-organ. ... So, I suggest to implement the 1st Theremin Concert for Aliens from Arecibo or Evpatoria Radar facility. ... The theremin was invented 80 years ago, in 1920 by Leon Theremin. ...