... 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 . ...

Direct Electron Imaging Using Back Thinned CCDs . ... A proximity focused Gen III image intensifier has been built using a back illuminated 512 x 512 CCD in place of the phosphor screen. Signal to noise, spatial resolution, minimum resolvable signal and life are discussed. ... Very low light level imaging is driven by the need for high quantum efficiency detection of single photons at the highest possible speed and the highest spatial resolution. ...

... ESO Science Newsletter December 2015 . 17 Dec 2015 . ... This newsletter is a summary of recent ESO Science Announcement items. Follow the links or visit ESO Science Announcements to read more. ... Read more . ... The allocation of ESO telescope time for Period 97 (1 April БЂ“ 30 September 2016) is expected to be emailed in the week beginning 21 December 2015. ... ESO Workshop, ESO Headquarters, Garching, Germany, 27 June БЂ“ 1 July, 2016 . ... Joint ESO, ALMA, NAOJ, NRAO Workshop. ...

... I present results from several seasons of photometric observations of X--ray sources in the Orion OB1a and OB1b star formation regions. The initial goal was to measure the rotational periods of several dozen pre--main sequence (PMS) stars. ... Infrared and optical data confirm that 90% of the X--ray sources are PMS and about 10% of the PMS stars may have disks. ... I find rotation periods for five stars at confidence of greater than 99.9/ greater than 99/ at much lower confidence. ...

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. ...

Position Switching Separation Tolerance with Arecibo in L-Band Travis McIntyre The University of New Mexico July 2010 Revised December 2013 Abstract The blocked telescope aperture at Arecibo creates standing waves in the bandpass around 1MHz. ... Test observations with Arecibo in L-Band show that position switching effectively removes standing waves for separations of one half FWHM or less. Standing waves remain for separations of one FWHM, increasing the rms of the baseline by 20%. ...

... The best seen visible auroral forms are due to precipitating electrons. ... As typical for diffuse aurora, the proton precipitation is confined to be most often on the equatorward part of the oval. ... When proton aurora occurs at the same local time sector as pulsating (electron) aurora, they are typically located northward from pulsations (e.g., Creutzberg et al., ... Eather, R. H., Auroral proton precipitation and hydrogen emissions, Rev. Geophys., ... Geophys., ... Res., ... 87 , 2481, 1982. ...

SITE 2010 Comprehensive Characterization of Astronomical Sites Kislovodsk, Russia, 49 October 2010 Conference Summary Marc S. Sarazin*a a European Southern Observatory, Garching, Germany Abstract The main topics discussed during the Site 2010 conference are outlined and the outcome is described. Keywords: Astronomical Site testing, precipitable water vapor, atmospheric turbulence, cloudiness, seeing 1. ... Site surveys for National observatory projects in China, India, and Iran benefit from this. ...

... Several knots of radio emission in the jets were identified and their motion could be followed between the images. ... The brightness evolution of the knots was found to be consistent with exponential decay of time constant 16 days. ... Knot Velocity and Distance Measurement . ... This paper presents preliminary results of recent 5 GHz observations of SS433 using MERLIN , including a measurement of its distance and an attempt to determine the behaviour of the knot brightness decay. ...

... The Stellar Oscillations Network Group (SONG) seeks to study p-mode (acoustic) oscillations in solar type stars. ... The observation of many solar-like stars will also help us to understand how solar p-modes are excited and damped. ... Naively, the two or three orders of magnitude improvement over this provided by the normal 1 second time resolution of the KPNO CCD cameras should be quite sufficient for such a detection. ... Figure: Non-cadenced data-a free-running observing sequence. ...

Next: Results & Discussion Up: Coronal Hole Diagnostics out Previous: Introduction . ... The dates of the observations discussed here, their locations, pointing, slit sizes and exposure times are given in BTDW. ... Line fits are given by the dotted line. ... An estimation of the errors in the derived parameters was obtained using the GA-derived parameters as an input for a ``classical'' IDL-CURVEFIT procedure (Peter, 1999; Peter & Judge, 1999). ...

... R.S. Furuya, R. Cesaroni, C. Codella, L. Testi, R. Bachiller, M. Tafalla . We present the results of high angular resolution observations at millimeter wavelengths of the high-mass star forming region G24.78+0.08, where a cluster of four young stellar objects is detected. ... One of the sources is detected only in the continuum at 2 and 2.6~mm and we suggest it may represent a good candidate of a high-mass protostar. Mantained by: Leonardo Testi . ...

... Programme . ... Presenter: Rob Sharp (Anglo-Australian Observatory) . Abstract: I report broad band optical Integral Field Spectroscopy of the central arcminute of the Centaurus A system. These intermediate resolution AAOmega-SPIRAL observations reveal an ionization cone and outflow structure in the emission line gas which I will discuss in the broader context of galaxy winds. go back . CSIRO 2009 Legal Notice / Privacy Statement Last modified: 15/11/2010 ...

... The NICMOS Parallel Program . Analysis . ... NICMOS observations made in parallel with the other HST instruments have produced an archive of over 2,000 images, covering a wide range of Galactic latitudes. ... The maximum sensitivity of these images is approximately 0.1 Jy, which should allow the detection of such astrophysically interesting sources as brown dwarfs in the solar neighborhood and star-forming galaxies out to z 3. ...

... In this work, we investigate some a new possibility to estimate correlations between radio source position catalogs (RSC). ... Catalogs AUS AUS AUS AUS AUS AUS BKG BKG BKG BKG BKG GSF GSF GSF BKG GSF IAA MAO OPA USN GSF IAA MAO OPA USN IAA MAO OPA USN MAO OPA USN OPA USN GSF IAA IAA IAA MAO With correlations, the system to be solve consists of the equations: The key point is to obtain a reliable estimates of ij. ...

... 2012 December 7 . Earth at Night . Image Credit : NASA , NOAA NGDC , Suomi-NPP , Earth Observatory , . ... Explanation: This remarkably complete view of Earth at night is a composite of cloud-free, nighttime images. ... It also has advantages compared to cameras on the International Space Station. While the space station passes over the same point on Earth every two or three days, Suomi-NPP passes over the same point twice a day at about 1:30am and 1:30pm local time. ... About APOD | ...

Communications For Your Astronomy Event . Articles | ... John Huggins, December 19, 2005 . ... Citizens Band Radio - The original . Multi-Use Radio Service . Family Radio Service (FRS) . General Mobile Radio Service . Hybrid Radios . Amateur Radio Service . ... Does your event need communications? ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . are trademarks of John Huggins ...

Next: CCD Operation Up: Charge Coupled Devices (CCDs) Previous: Charge Coupled Devices (CCDs) . ... However it is only now that a number of important X-ray astronomical applications of CCDs have reached critical development stages, so that this is an appropriate time to review the application of space-borne CCD instruments to cosmic X-ray astronomy, and highlight the particular concerns which are being addressed for X-ray instruments, as distinct from optical applications. ...

... Future seminars . ... G.V. Levina (Institute of Continuous Media Mechanics) . ... Abstract . ... The INTEGRAL mission and its first results" . ... Reconnection - new basic results and solar simulations " . October, 30 . ... D.L. Vainchtein (IKI RAN; Dept. of Mechanical and Environmental Engineering, University of California Santa Barbara, USA) . ... New results on Solar Structure and Dynamics and Solar Space Observatories " . ... E.B. Gliner (Theoretial Research Institute, San Francisco) . ...

... The most precisely determined characteristic for accreting neutron stars (NS's) is their period. ... Period changes show fluctuations. ... Some applications of stochastic processes in astrophysics especially in accreting systems were discussed in Lipunov (1987),Hoshino Takeshima (1993) and Lipunov (1992).In Hoshino Takeshima (1993) the authors, using simple models of MHD turbulence, try to explain aperiodic changes in X-ray luminosity of X-ray pulsars. ... Here, -constant angular momentum. ...