... Infrared observations of RCBs show that, even at maximum light, there are copious amounts of dust surrounding the star. ... Therefore the obscuring dust can only cover a fraction of the stellar surface. The picture that emerges (Fig. 2 ) is that at a particular phase in the pulsation cycle, conditions in the photosphere can compel the carbon-rich gas to be expelled from a part of the stellar surface to cool, condense and form dust grains. ...

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In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

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• Galaxy Gallery Page II

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

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• New LBV Stars in the Andromeda Galaxy

. Please standby and you will be automatically connected to the new location of the unframed Supernova page. Or, click on the link above. If you have questions or problems, please email me at David Bishop dbishop@vhdl.org . Last modified: Mon Aug 27 12:40:15 EDT 2001

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• Bright Supernova - Archives
• Supernova 2002fk in NGC 1309
• THE BRIGHT SUPERNOVA 1991T IN NGC 4527; AN AMATEURS PRESPECTIVE

... Credit: L. Drissen, J. Roy and C. Robert ( Universite Laval ), Y. Dutil ( CFHT ), NASA Explanation: These two clusters of bright, newly formed stars surrounded by a glowing nebula lie 10 million light years away in the dim, irregular galaxy cataloged as NGC 2366. ... A comparison with ground based images indicates that in three years this star's brightness increased by about 40 times making it currently the brightest star in this dim galaxy . ... Publications with keywords: stars . ...

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• Comet Holmes from the Hubble Space Telescope
• Journal "Peremennye Zvezdy"
• XWare > APOD

In star-forming galaxies, dust plays a significant role in shaping the ultraviolet (UV) through infrared (IR) spectrum. ... Using three samples of galaxies observed with the Spitzer Space Telescope and our dusty radiative transfer model, we find that young stellar populations (on the order of 100 million years old) dominate the dust heating in star-forming galaxies, and old stellar populations (13 billion years old) generally contribute less than 20% of the far-IR luminosity. ...

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• Near Infrared Camera and Multi-Object Spectrometer Instrument Handbook for
• Cool dust heating and temperature mixing in nearby star-forming galaxies
• Surface Brightness Profiles

The night sky brightness, together with number of clear nights, seeing, transparency, photometric stability and humidity, are some of the most important parameters that qualify a site for front-line ground--based astronomy. ... Night sky at ESO-Paranal (Chile). ... Night sky brightness data . ... UBVRI night sky brightness at ESO-Paranal during sunspot maximum (A 2003, PDF) . ... The Dancing Sky: six years of night sky observations at Cerro Paranal (Starlight 2007 conference proceedings, PDF) . ...

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• The bright star Alpha Centauri and its surroundings
• The bright star Alpha Centauri and its surroundings | ESO
• The bright star Alpha Centauri and its surroundings | ESO Ireland

... 2001 December 6 . Comet Linear (WM1) Brightens . ... Explanation: A comet bright enough to be seen with binoculars is swooping into southern skies. Comet C/2000 WM1 (LINEAR) continues to brighten and develop tails as it nears its closest approach of the Sun in late January 2002. ... In the above picture from the Curtis Schmidt 0.6-meter Telescope in Chile , a 30-second exposure in red on December 4 captured detail in Comet LINEAR WM1's emerging dust tail . ... About APOD | ...

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• APOD: 2001 November 3 - Bright Stars, Dim Galaxy
• APOD: 2007 November 28 - Comet Holmes from the Hubble Space Telescope
• APOD: April 9, 1998 - Quasar in an Elliptical Galaxy

ATNF Annual Report 2000 (submitted) . ... One of the first products is the HIPASS {\it Bright Galaxy Catalogue}, which is a catalogue of the 1000 apparently brightest HI galaxies in the southern hemisphere. ... In Figure 1 we show the spatial distribution of the brightest HIPASS galaxies. ... Figure 4 shows the velocity distribution of the 1000 brightest HIPASS galaxies (orange) compared to the 1000 brightest optical galaxies (selected from the Lyon/Meudon Extragalactic Database using blue magnitude). ...

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• Brightness Units
• Surface brightness measurements of extended galactic nebulae
• The HIPASS Bright Galaxy Catalog

... STScI-PRC98-11A STARING INTO THE WINDS OF DESTRUCTION: HST/NICMOS IMAGES OF THE PLANETARY NEBULA NGC 7027 The Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) has captured a glimpse of a brief stage in the burnout of NGC 7027, a medium-mass star like our sun. ... The material settles into a wind of gas and dust blowing away from the dying star. ... During this phase, intense ultraviolet radiation from the central star lights up a region of gas surrounding it. ...

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• Procedures for Observations
• APOD: August 6, 1998 - Infrared Horsehead
• APOD: November 12, 1996 - Comet Hale-Bopp Passes M14

[ CATS home ] [ Back to CATS list ] [ ftp ] . 2000ApJS..131..335Rutledge+ . Division of Physics, Mathematics and Astronomy MS 220-47, California Institute of Technology, Pasadena, CA 91107 rutledge@srl.caltech.edu, rb@astro.caltech.edu, prince@srl.caltech.edu

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• RATAN-600 NCP bright radio sources
• Introduction
• The Parkes 6 cm Galactic Survey

... Luminosity (L) · · · · A source's luminosity is the power that it emits in radiation. ... NB Astronomers often say `flux' when they mean `flux density' · SI units are Wm-2Hz -1 -26 filter · Also used are Jy 10 Wm-2Hz -1 E= РРРF d dA dt Specific Intensity, Surface Brightness (I) · Specific intensity (or surface brightness) is the power received (or emitted) per unit area per unit frequency per unit solid angle. ч F at surface of a spherical source = I · · Specific intensity is independent of distance...