... The dark current and the cold columns contribute to the additive term A; the quantum-- and transfer--efficiency enter into the multiplicative term . ... The objective of the first step in reducing CCD--images is to determine the relative intensity of a science data frame. ... FLAT--frames to determine the term , and . DARK--frames to describe the term . ... If set to the average signal of the dark--corrected FLAT--frame or a subimage thereof: . ...

Proceedings of the XXVIIth Young European Radio Astronomers Conference (YERAC). ... Please Note: e-mail addresses and external links in these contributions were correct when these papers were written in 1995, but may no longer be valid. ... In addition to the hypertext version of each paper, indicated by the link from the title of the paper, there are links to postscript versions of each paper, which are suitable for printing if you want a hardcopy of a given paper. ... Sandor Frey (or postscript ) . ...

I'm glad you're interested in collaborating on the ConcepTests for Astronomy WWW database project! ... I'm looking forward to your contributions! ... a) high luminosity, high temperature to low luminosity, low temperature . b) high luminosity, low temperature to low luminosity, low temperature . c) high luminosity, low temperature to low luminosity, high temperature . d) high luminosity, high temperature to low luminosity high temperature. ... Back to Paul Green's Peer Instruction page. ...

... First of all you should scale your photos to 640x480 (landscape) or 480x640 (portrait), using the graphic software of your choice. ... In addition, you should also provide a smaller version of each image with 160x120 (landscape) or 120x160 (portrait) which will be used as thumbnails for your gallery. ... yourname.tar] . ... Here, [directory] is the source directory where your processed images are stored, and [yourname.tar] is the name of the resulting archive which should be firstname_lastname.tar ....

... The very close agreement between the model and number counts at 15 and 24 ЮМm strikingly implies that (1) the polycyclic aromatic hydrocarbon features remain prominent in the redshift band 0.5-2.5 and (2) the IR energy output has to be dominated by ~3У?1011 Lsolar to ~3У?1012 Lsolar galaxies from redshift 0.5 to 2.5. Combining Spitzer with Infrared Space Observatory deep cosmological surveys gives for the first time an unbiased view of the infrared universe from z=0 to 2.5. ... citations = 214 . ...

... Proposing for VLBI Time at Arecibo . ... Documentation (Field System, VLBA4 terminal, Mark 5 system) . ... In 2001, the Arecibo Observatory received its hybrid VLBA-MARK IV (VLBA4) data acquisition system, and currently NAIC commits Arecibo to support VLBI observing up to a maximum of 4% of the 305-m's observing time. ... Tracking Time (h:mm) . ... The inclusion of the 305-m Arecibo radio telescope can dramatically boost the sensitivity of VLBI observations, even with its limited source tracking...

... 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. ...

... In these pages we have collected contributions by fellow amateurs supernovae hunters. These contributions concern mainly the discoveries they made and their searching activity. ... External link) . The discovery of SN1997bp in NGC 4680 (from TA Magazine, vol34, n.397) - text and images. Visual Supernova Searching With The 40 inch Telescope at Siding Spring Observatory . ... A web page on SN1995G in NGC 1643 (external link to the South Australia Astronomical Society) - text and images. ...

... He made observations of a supernova (literally: nova= "new star") in 1572 (we now know that a supernova is an exploding star, not a new star). ... Brahe's meticulous observations showed that the supernova did not change positions with respect to the other stars (no parallax). ... This was early evidence against the immutable nature of the heavens, although Brahe did not interpret the absence of parallax for stars correctly, as we discuss below. Brahe made careful observations of a comet in 1577. ...

Next: Armagh Observatory New TSN Up: New TSN Action Plan Previous: What We Do . ... In this way, the Observatory contributes directly to the Northern Ireland Executive's New TSN Policy and Programme for Government, especially in providing enhanced access and choice for those in education, and lifelong learning opportunities for all. Next: Armagh Observatory New TSN Up: New TSN Action Plan Previous: What We Do M.E. Bailey . ...

. July 14 . November 8 . Previous slide . Next slide . Back to first slide . View graphic version .

... We have observed and studied critical supercurrents, Ic, in cross-type Nb-Cu/Ni-Nb junctions with Josephson layers prepared from diluted ferromagnetic alloys. For suitable values of the exchange energy in the ferromagnet and the F-layer thickness we have observed Ic(T) oscillation with vanishing Ic for the definite values of T and dF. ... Critical supercurrents, Ic, in Nb-Cu(1-x)Ni(x)-Nb Josephson SFS junctions with F-layers prepared from ferromagnetic Cu(1-x)Ni(x) alloys have been studied. ...

Astronomy Picture of the Day . ... 27.09.1998 . ... Einstein 's many visionary scientific contributions include the equivalence of mass and energy (E=mc^2), how the maximum speed limit of light affects measurements of time and space ( special relativity ), and a more accurate theory of gravity based on simple geometric concepts ( general relativity ). ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: time - space . Publications with words: time - space . ...

... 30, 2006 . ... If you retrieve these files via a Web browser, please note that you need to use the browser's "Save As..." facility. ... Figures must be provided as Encapsulated PostScript files and should be incorporated in your contribution using the standard Latex2e "graphicx" package as demonstrated in the demo file author.tex. ... Please submit the LaTeX source file of your contribution, and PostScript/PDF files of any figures, via email (!!!) to Iris Bronnert ( ibronner@eso.org ). ...

... We summarize the discussions that took place during the FITS Birds of a Feather (BoF) session, which was held Monday, September 23, 1996 at 16:00. For completeness we also include a summary of the 1995 FITS BoF, which was never published. ... Oral papers by Clarke, Allen, Mink, Mandel, and Wells were presented in a special FITS afternoon session, and posters were presented by Pence, Farris, Tripicco, and Stobie; see the papers by these authors elsewhere in this volume. ... CFITSIO (Pence) . ...

... PGP keys . How it gets done . ... amead@soltec.net - massive editing (many, many corrections), also tried to teach me about the proper use of the apostrophe (when it comes to written language and grammar I am incredibly bad). ... If you wish to contribute written material, edits, or other work to the LASG please email me at seifried@seifried.org . ... So the LASG master copy is stored on my NT Server (which I use as a workstation), and maintained via FrontPage, but how does it get to you? ...

... Tonight's Sky . ... Sky this Month . ... milky way . ... The Sky This Week: April 1 - 10 . ... Sky this Week . ... Astronomy for Kids . ... Sky Events . Get to Know the Night Sky . ... Is there any way photons could contribute to the mysterious dark matter? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Results 3. ... 2004), Escapa (2011): Hamiltonian approach, simplified elastic response. ... PАg. ... Let us recall that assuming a rheological model based in Smith (1974) , Wahr (1979) and IERS (2010) for the elastic/anelastic response of the Earth, the second order harmonic components of the redistribution potential admit a truncated development in complex spherical harmonics in the form Generalized Love Numbers, dependent on: Harmonic order, Excitation frequencies In magnitude, PАg. ...

The Ergodic Theory of Dynamical systems is a branch of the theory of Differential Equations. It was founded as a separate discipline by Poincare, and developed by Birkhoff and Smale. ... The proposed course is an introduction to the subject. ... Prerequisites: introductory course to Ordinary Differential Equations. ... Action on measures, notion of a transfer operator, invariant measures . ... Direct and skew products . ... Introduction to the modern theory of dynamical systems, Cambridge Univ. ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...