. < Previous Figure < Main Page < Next Figure . The same as in Fig. 1. Note the two DIBs around 6400A seen only in hot stars because of stellar contamination in late B supergiants. Note the varying intensity ratios of the three weak features between 6440 and 6450 A. < Download average spectrum of o Per . < Download average spectrum of reddened stars . < Previous Figure < Main Page < Next Figure .

... We construct a composite quasar spectrum from 149 HST FOS spectra of 80 quasars with mean redshift . ... The continuum longward of 1000? can be modeled as a power law with . ... The break in the power--law index is a feature expected in Comptonized accretion--disk spectra. ... The spectral features in the sub--Ly region of AGN spectra provide critical insights into the physical processes around the central engine, and they become accessible to IUE and HST at intermediate redshift. ...

Since the light from galaxies represents the integrated contribution of its consitutient stars, then we can learn about stellar populations in galaxies by modelling their light by summing up individual stellar spectra for different kinds of stars. ... The data cover the wavelength range 3500 - 9000 angstroms. ... Retrieve Digital Stellar Spectra Click on the appropriate spectral type. ... Note that the designation V means main sequence, IV means subgiants, III means giants, I means supergiant. ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... All around Aries . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

XMM-Newton CCF Release Note XMM-CCF-REL-174 pn telescope e ective area modi cation M. Kirsch June 9, 2004 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS ag XRT3 XAREAEF 0009 2000-01-13T00:00:00 ONAXISXAREAEF 3.169 NO 2 Changes XMM EPIC-pn observations with very high statistic show residuals at the Silicon edge around 1.8 keV and gold edge around 2.2 keV (see Figure 1). The gold edge feature can be explained by not perfect calibration of the telescope e ective area. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. October 24, 1997 . Moving Echoes Around SN 1987A . ... WFPC2 , HST , NASA . Explanation: Yesterday's image highlighted reflective rings of light emitted by a supernova explosion. Today's pictures , taken over a year apart, highlight how these echoes are seen to move over time. ... About APOD > . ... NASA Technical Rep.: ...

Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Moon . ... Comets and Asteroids . ... What changed our view of Chariklo is the discovery of a ring system around it, the first such feature found around a Solar System body smaller than a gas giant planet. ... Almost certainly the rings were born when a collision with a smaller asteroid blasted millions of tonnes of debris off CharikloтАЩs surface. ... A ring system detected around the Centaur (10199) Chariklo (Braga-Rigas et al.) ...

... The Einstein On-Line Service (EOLS) is a simple menu-driven system which provides an intuitive method of querying over one hundred database catalogs. In addition, the EOLS contains over 30 CD-ROMs of images from the Einstein X-ray Observatory which are available for downloading. The EOLS provides all of our databases to the NASA Astrophysics Data System (ADS) and our documents which describe each table are written in the ADS format. ... The EOLS provides three options for data retrieval. ...

... identify a realistic size of an event on the wavelet map; for example, a rectangular box one-duration wide and allowing for limited ratio of durations in height, has been used. identify all local maxima by placing a box around them and verifying that no larger values occur within the box. within each box, normalize the values of the map by the local maximum. threshold what is left to show the vicinity of each maximum. ... Figure 25: Local maxima of g2-energy map. ...

... Explanation: Did you know that our Milky Way Galaxy has huge bubbles emitting gamma rays from the direction of the galactic center? ... Assuming the bubbles emanate from our Galaxy's center, the scale of the bubbles is huge, rivaling the entire Galaxy in size, and spanning about 50,000 light years from top to bottom. Earlier indications of the bubbles has been found on existing all sky maps in the radio , microwave , and X-ray . ... Milky Way Galaxy Doomed: Collision with Andromeda Pending . ...

Download 1.1 Beta Now! ... Separate object manipulation mode added (also still available with Control Key). ... Tom's TkDraw is currently in beta release. It is my own personal drawing program and original Tcl/Tk project which I started more than ten years ago. ... Limited support for images was just added, and is great for tracing an image, or adding some annotations to an image (for instance drawing a route onto a map without actually altering the map image). drag, reshape, and resize objects . ...

... CSIRO Arch is an open source free enterprise search engine based on Apache Nutch , a popular general purpose search engine that is capable of indexing billions of web pages using clusters of computers. Arch uses Nutch and Solr software and adds additional features to provide a powerful and efficient search engine that is optimized for use in corporate web environments. ... Excellent search quality: Arch has solved the problem of providing good search results for enterprise web sites and intranets! ...

... The presence of solid­state emission bands is compared to other indicators of circumstellar material, such as Hff emission, optical variability and sub­mm continuum fluxes. ... However, a strong dependence on spectral type of the central star seems to be present: stars with spectral type earlier than B9 show either amorphous silicate in absorption or infrared spectra dominated by PAH emission, whereas more than 70% of the stars of later spectral type show silicate emission. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Sound artist, Robert Jarvis has been short-listed for the New Music Award for a groundbreaking sound-art work to be based in Northern Ireland. Entitled "aroundNorth", the piece will be a musical composition inspired by the movement of the stars around the Celestial North Pole and will take the form of a permanent sound installation based in the grounds of the Armagh Observatory. ... Armagh. ...

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . ... Publications of the ASP (PASP) . ... Editorial: 2001 is just around the corner . ... Shuttling between "Animals That Kill for Fun" and "Astrology: Science of the Future," I came upon live coverage of construction of the International Space Station. ... The year 2001 is just around the corner, but we've a ways to go to reach the cinematic visions that make us want tomorrow here today. ...

Sub-Arcsecond Resolution Mid-IR Imaging of The Starburst NGC 520 ґ Bojan Nikolic, Paul Alexander, Garret Cotter, Malcolm Longair AP Group, Cavendish Laboratory, Cambridge, U.K. Marcel Clemens Universita degli Studi di Padova, Italy [3], which is N0 = 2.6 в 1053 s-1, by revising their K-band extinction estimate to AK = 3. Using IRAS data, and the Radio-FIR correlation, we estimate the total energy release in the nuclear starburst in NGC 520 to be 6.7 в 1010L . ... Michelle observations of NGC 520. ...

FEATURES OF THE HYDROGEN DISTRIBUTION AROUND LUNAR CRATERS PROCLUS AND KEPLER. ... In result of analysis of the data Lawrence and Feldman constructed the hydrogen distribution on the lunar surface [1]. ... However, the authors shown, that EN flux data features may be explained by other element abundance in the lunar soils, namely: Si, Ca, Gadolinium (Gd), Samarium (Sm) and Fe. ... Using of the Feldman's interpretation of the Lunar Prospector data [8], we constructed hydrogen distribution map (Fig.1). ...

Next: Imaging Polarimetry with NICMOS Up: NICMOS Data Calibration and Previous: The Photometric Performance of . ... NICMOSlook and Calnic C . ... Extracting spectra from a large number of NICMOS grism images requires a convenient interactive tool which allows a user to manipulate direct/grism image pairs. ... NICMOSlook and Calnic-C are two programs that were designed to take advantage of the fact that the NICMOS grism mode typically consists of taking both a direct and a grism image. ...

Features of the Installer . ... Chapter 4. Installing the NVIDIA Driver . ... Without options, the .run file executes the installer after unpacking it. The installer can be run as a separate step in the process, or can be run at a later time to get updates, etc. Some of the more important commandline options of nvidia-installer are: . nvidia-installer options . ... The installer uses an ncurses-based user interface if it is able to locate the correct ncurses library. ...