... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

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... CONVERT/PHOT . Helps you make a new table of observational data . MAKE/HORFORM . Make a blank FORM to fill in with horizon-obstruction data . MAKE/PHOTOMETER . generates or checks the instrumental table file for a photometer . MAKE/PLAN . generates a photometric observing plan . MAKE/STARFILE arglist . Helps you make a new file of program or standard stars . REDUCE/PHOT . Reduces tables of observational data . ...

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• Strategy
• Standard-star files
• Using a Standard Star

... The first step to improve the FORS calibration is therefore to obtain data to allow a computation of the illumination correction across the field. ... Another limitation on the calibration accuracy has been the brightness of the Landolt standards which have forced the use of extremely short exposures introducing small but non-negligible shutter-time errors and also resulting in a very small number of useful standards per frame. ...

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• ESO - Standard Stars Catalogues
• ESO - Standard Star Catalogue Search Tool
• ESO - Archives and Catalogues

... A total of 19 standard observing bands are defined at the VLA. ... The tables below describe the bands. ... VLA STANDARD BANDS - VLA SYNTHESIZER SETTINGS VLABAND VLAFEAB VLAFECD VLASYNA VLASYNB FLUKEA FLUKEB FEFILT CC 0.00 0.00 3860.1 3810.1 100.00000 200.00000 0000 UU 19.60 19.60 3610.1 3660.1 100.00000 200.00000 0000 KK 17.60 17.60 3860.1 3810.1 100.00000 200.00000 0000 LL - 3.20 - 3.20 3639.9 3560.1 100.00000 200.00000 0000 XX 13.40 13.40 3939.9 3889.9 ...

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• Standard Setup Files
• Metadata Standards
• Standard Stars - CCD Photometry, Transformations and Comparisons

Next: GRISMCAL Up: COLORTRANS Previous: Generation from Ground Calibration Contents . The transformations from the OM instrumental system to the standard Johnson's system were established based on in-flight observations. ... We have derived the flux conversion factors from OM observations of seven spectrophotometric standard stars (white dwarfs: Hz4, GD50, GD153, LBB227, BPM16274, Hz2 and G93-48). ...

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• XMM-Newton OM Response Files Page
• Flux calibration
• SAS package documentation standards

... This routine is designed to read in the current correlator set-up, go to the chosen source, and then take data pointing directly at the source. This routine will automatically wait until you are on source before beginning to take data. ... Additionally, this routine allows you to take an ON/OFF calibration pair (one 10s scan with the noise diode on, followed by a 10s scan with the diode off), using the chosen noise diode configuration (see Section 1.6 ). ...

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• STANDARDS OF REST & REDSHIFT CORRECTIONS
• OBSERVING PROCEDURES
• Spectral-Line Observing at AO

... There are five standard data formats for HSP data. ... The datasets contain a standard header packet , a unique data log , and one to four science data files (and corresponding data quality files). ... HSP Data Files . ... Science data, digital sky .d2h/.d2d . ... Each of the science data files has a corresponding quality file that contains single-precision floating point values. ... The HSP calibration program, calhsp , generates the calibrated file for each corresponding raw science data file. ...

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• http://www.stsci.edu/instrument-news/handbooks/nicmos/c14_calplan.doc6.html
• HSP Data Handbook
• Fluxes and Standard Magnitudes

... Standard Commands . ... TwistedActor.Actor is core code for writing an actor: an instrument control computer (ICC) or hub-based script that does something useful. This manual describes the standard commands and keywords that any actor based on TwistedActor.Actor will support. All actors based on TwistedActor typically support the following standard commands (plus additional device-specific commands documented in that actor's manual). ... Connect one or more devices (if not already connected). ...

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• Astrophysical Research Consortium - Apache Point Observatory
• Standard Stars For ARCES
• Information for Observers

Next: Definition of Scientific Misconduct Up: scientific Previous: Introduction . ... This Code of Good Practice closely follows the Statement on Safeguarding Good Scientific Practice issued by the Biotechnology and Biological Sciences Research Council (BBSRC) in 1998. ... The Observatory expects the highest standards of scientific integrity to be adhered to by the researchers, students and other staff that it funds, whether they are employees or associates of other institutions. ...

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• Armagh Observatory
• SCL Sfit Commands
• Definition of Scientific Misconduct

... The material in "From Stargazers to Starships" meets several important requirements of the national standards. Pages cited below are from National Science Education Standards National Academy Press, Washington 1995. ... For example: the sections on astronomy not only describe calendars and sundials (including their construction), but also the astronomy of the ancient Greeks, including two different ways in which ancient Greeks estimated the distance to the Moon. ...

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Gravitational wave contribution to CMBR anisotropy V.N. Lukash 1 and E.V. Mikheeva 2 Astro Space Center of P.N.Lebedev Physical Institute 3 , Profsoyuznaya 84/32, Moscow 117810, Russia We argue that the contribution of cosmic gravitational waves into the largeґscale CMBR anisotropy can exceed 50% for a broad class of the inflationary models with effective \Lambdaґterm producing the standard local spectrum of primordial cosmological perturbations. ... 10 7 k hor (Figure 2). ...

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• Abstract
• Astrophysics Group OIFITS: A Data Exchange Standard for Optical (Visible/IR)
• Molecular oxygen in interstellar clouds

... Briefly, the count rate at the detector from a source at a redshift z is . ... Another possible way that could lead to arising diverse peculiarities in the - distribution induced by the sources evolution is connected with a possible non-monotonic character of the star formation rate in galaxies. ... The most prominent feature of the obtained theoretical - is a notable sharp increase at low count rates due to evolutionary effects. ...

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... The New 1997 IEEE Standards Products Catalog features the complete listing of standards publica-tions and services IEEE Standards offers, along with the information you need to place your order. ... Books and Other Products on Standards - contains a detailed listing of informative print and electronic publications relevant to standards and their implementation in areas of electrical engineering, electronics and computer technology. ... IEEE Standards Products Listing 22 . ... Power Electronics 41 . ...

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• Open Systems Handbook: A Guide to Building Open Systems

Visual Discovery of SN 1996bk in NGC 5308. ... Of course we are pleased when we make a discovery, but visually observing galaxies is our real pleasure; supernovae may be the "rational" motive to look at a galaxy. ... Back to science.. ... Some 30,000 observations in four years on a programme of 600 to 800 galaxies (priority is given to the northern ones) have produced two official supernovae, one in 1995 and this one. ... We would like to thank the amateurs directly involved in confirming 1996bk. ...

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• Contributions by amateurs: SN1995V.
• Contributions by amateurs: SN1995al.
• Contributions by amateurs: SN1995ad.

... Superb optical performance coupled with time proven computerized pointing and tracking has made the LX200 ACF series a best-seller in the high-performance telescope class. ... MeadeтАЩs new LX70 Series offers high-quality German equatorially mounted telescopes with slow-motion controls and heavy-duty steel tripods. ... For crisp wide-field observing and imaging, few optical designs match the performance of a true triple-element apochromatic refractor. ... Meade Standard Field Tripod #07020. ...

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• Meade Standard Field Tripod - Tripods and Piers - Accessories - Products
• Telescopes - Products
• Products

Next: Electronic colophon Up: Contents Previous: Data Modeling and Analysis . These Proceedings were prepared as a single LaTeX document, using a style based on the PASP conference style. ... There are 119 figures, for which we received 130 Encapsulated PostScript (EPS) files and only eight figures on paper. ... We scanned the eight printed figures (and the conference photograph), so that all of the figures would be available in the electronic version. ...

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• FITS BoF Session
• Real-Time Linux Driving a Spectrometer
• Electronic Submission of HST Phase I Observing Proposals

. To redirect the standard input for a command use the < (less than) character followed by the name of the input file. For example: mail tony < memo . This redirects the standard input to the mail command so that it comes from the file memo . The effect of this is to mail the contents of this file to the user tony .

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• Redirecting standard output
• Redirecting standard input and output
• Appending standard output to a file

... 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. ...

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• Dwarf galaxies donт??t fit standard model | Astronomy.com
• Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets,
• т??Standard candleт?? supernova extraordinarily magnified by gravitational

Le risorse informative in astronomia tra metadati e web semantico . L'ABC di XML . ... Il nuovo sito del Dipartimento . Uso del Template Toolkit per creare siti web . Esempio pratico di uso di XML . I have contributed with a stylesheet to the Css Zen Garden project which is devoted to the diffusion of CSS standard. ... Web design and graphics . ... 16:41:21 16-Mar-2006 ...

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• CHIANTI atomic database
• HwB: EISA (technical) Connector (Offline)
• Relevant Standards - Apache HTTP Server

... Using UNIX System Calls and Library Functions . ... To use system calls and library functions in a C program we simply call the appropriate C function. Examples of standard library functions we have met include the higher level I/O functions -- fprintf() , malloc() .. ... For most system calls and library functions we have to include an appropriate header file. e.g. stdio.h, math.h . ... Information on nearly all system calls and library functions is available in manual pages. ...

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• NEdit
• C Standard Library Functions
• Spectropolarimetry of the standard HD204827