Next: Radial velocity of the Up: Optical spectrum of IRAS04296 Previous: Observations and spectra reduction . ... However, molecular emission features are only very rarely observed in the optical spectra of PPNe. ... On the other hand, it is well known that cometary nuclei spectra show prominent Swan band emission. In both spectra of IRAS04296 we have discovered strong emission in the (0;0) and (0;1) bands of the Swan system of the molecule. ... Now consider the case of IRAS04296. ...

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The figure below shows what stellar spectra are like in this wavelength range. All stars hotter than about 3000 K effective temperature radiate like a hot blackbody at these long wavelengths, possibly with a very few atomic lines (of Hydrogen, in the A-type stars) or molecular bands (the CO band overtone near 2.25 microns for example, in K-type stars and G-type stars). ... unusual features: mixed chemistry sources, Wolf-Rayet stars, ice bands, featureless carbon-star spectra ...

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• Dusty HII Regions and Planetary Nebulae
• The Most Common Dust Features
• Dust Around Stars

... While Sfit accepts input from "stdio", it is more natural to save/edit commands in a file (eg "solve_input.sfit") and run the code simply by entering > Sfit solve_input.sfit [linelist] . ... The model grid (3.4MB) produced by Example 1 and a selection of input spectra ( f008 f036 f068 f304 f354 ), together with SFIT output files are also given in this folder . ... The model grid (2.8MB) produced by Example 3 and an input spectrum together with SFIT output files are also given in this folder . ...

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• J.G. Doyle, Research Astronomer
• Armagh Astronomers to observe Ringing Star with Global Telescope

Next: Amorphous magnesium silicate Up: Examples of data contained Previous: Examples of data contained . ... We have used the infrared optical constants of forsterite contained in the database for calculating the absorption cross sections of spherical and non-spherical particles in the Rayleigh limit (see Fig. The spectra are obtained by averaging the cross sections calculated for the three different crystallographic directions. ...

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• Wavelength dependence
• The 2175? feature
• Extinction properties (transmitted radiation)

... 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. ...

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• Lecture Series 2015-2016 ? Amateur Astronomers Association of New York
• Solar Observing, Grand Army Plaza, Brooklyn ? Amateur Astronomers Association
• Astronomy Workshop: Observing Variable Stars from the City ? February 15, 2015

... Moon . ... What can astronomers tell us about the different colors on the surface of Jupiter's moon Europa? ... We can use the colors of Europa s surface to tell us about the chemical compounds that make up the surface and subsurface of the jovian moon. Even before the first spacecraft made a close visit to Europa, astronomers on Earth used telescopes to study the moon and were able to use a technique called spectroscopy to determine that Europa s surface is composed mostly of water ice. ...

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• Web Extra: Astronomers animate one of the largest galaxy clusters ever observed
• Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets,
• Astronomers watch delayed broadcast of a rare celestial eruption | Astronomy...

... 2003 July 10 . Dust Storm Over Northern Mars . Credit: Malin Space Science Systems , MGS , JPL , NASA . Explanation: Almost on cue , as Mars nears its closest approach to planet Earth in recorded history, ominous seasonal dust storms are beginning to kick up. Observers worry that the activity may presage the development of a planet wide dust storm , frustrating attempts to view Mars in the coming months, a situation similar to the Red Planet's uncooperative behavior in 2001. ...

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• APOD: March 28, 1996 - Near the Nucleus of Hyakutake
• APOD: 2004 September 3 - Hurricane Frances Approaches Florida
• APOD: 2002 November 20 - Leonids vs The Moon

... A concrete application is displayed step by step by the command: TUTORIAL/CLOUD . The data used for this example are CaII absorption features observed in the spectrum of SN 1986g in NGC 5128 (observer: S. d'Odorico, instrument: CASPEC). ... Sampling is 0.05? per pixel and the measured instrumental resolution, 17km/s. The final cloud model consists of 12 absorption doublets. The corresponding image includes both components K and H and has been convolved by a gaussian PSF of 0.22? (17km/s) FWHM. ...

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• Doppler Shift
• Redshift Exercise
• Image Restoration

This annotated example walks a user through a PINTofALE session using predominantly .par files where available. ... read in line and continuum emissivity databases, . compute a theoretical spectrum, . spectral browsing using SHOW_LINE . ... Carole Jordan type" plot!) in_flx=fitlines_fstr.flx @potem_tool.par ; plot the output EM curves @plotem.par ;NOTE: ; the emission measures are in the IDL save file !ARDB+'example_5.save' ;save,file=!ARDB+'example_5.save',out_LOGT,out_EM,out_multid . ...

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• The AstroStat Slog missing data
• Period Criteria
• The AstroStat Slog Efron

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

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• Wavelength Calibration at Moderately High Resolution
• AIRY: Astronomical Image Restoration in interferometrY
• Querying by Example Astronomical Archives

These are very prominent absorption lines is most all galaxies. ... These pair of absorption lines will appear in all the spectra and they should be your principle source for determining the redshift. ... When this applet opens you will see an iconic representation of galaxies in the left hand side of the applet and a target area in the right side of the applet. ... Note: What you are doing in this excercise is identical to what Hubble did in the 1920's and you are using the same galaxies. ...

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• Digital Stellar Spectra
• Astronomy HyperText Book
• The Galaxy Gallery: Messier Objects

... Bad Astronomy . Misconceptions . ... Bad Astronomy : The Moon only shows one face to us because it is not rotating. Better astronomy : The Moon only shows one face because it is rotating, once every time it revolves around the Earth. ... Place the Moon model on the table about 30 centimeters (one foot) away with the X facing the Eart