We present IRAC and MIPS images and photometry of a sample of previously known planetary nebulae (PNe) from the Surveying the Agents of a Galaxy's Evolution (SAGE) survey of the Large Magellanic Cloud (LMC) performed with the Spitzer Space Telescope. Of the 233 known PNe in the survey field, 185 objects were detected in at least two of the IRAC bands, and 161 detected in the MIPS 24 ЮМm images. ... We also explore the potential value of IR PNe luminosity functions (LFs) in the LMC. ...

... Australia Telescope Steering Committee . ... Parkes radio telescope . ... Late Stages of Stellar Evolution . Welcome to the home page of the Late Stages of Stellar Evolution" We are a research group which operates within the Astrophysics Group of the Australia Telescope National Facility. ... To investigate the late stages of stellar evolution and in particular the role of stellar mass-loss in the evolution of asymptotic giant branch stars, proto-planetary nebulae and extremely massive stars. ...

... 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. ...

... General information . ... Staff . Research staff . ... Information . ... Historical highlights . Historical research . ... This process is thought to occur in circumstellar disks of gas and dust around young stars on rather short timescales : infrared surveys show that the number of low mass stars with disks drops dramatically for stars older than 10 Myr, suggesting that in order to form large solids before the disk disperses, the growth process has to take place within a few million years. ...

... Inhomogeneous planetary nebulae: Carbon and Oxygen abundances, Astron. ... Abstract . text in English . ... text in Russian . ... Chemica evolution of the system of galactic planetary nebulae , Astrophysics, 45 , 451-463 (2002) . ... Evolution of Elemental Abundances in Planetary Nebulae, Astronomy Letters, 32 , 557-565 ( 2006 ) . ... text in Russian (0.23Mb) . ... He, C, N, and O Abundances in an Ensemble of Galactic Planetary Nebulae, Astronomy Letters, 35 , 518-533 ( 2009 ) . ...

Next: Unusual Emission near a Up: NICMOS Science Previous: The Stellar Population in . ... Three examples are presented of how ISOCAM 1 sees the process of stellar evolution. i) Standard staring and coronographic observations with ISOCAM towards BD+31 643 are presented. ... Position 4 is closest to the star; Position 6 coincides roughly with the minimum of emission seen in the images; position 7 with the ring. ... I presented three examples of the evolution of stars as seen with ISOCAM. ...

... GSAOI Home . ... Science . ... Despite vast increase in our understanding of the evolutionary nature of planetary nebulae (PNe) during the last three decades, a central question remains: where is the missing mass? Theoretical evolutionary tracks predict that all stars with masses in the range 1.4-8 M Sun should become PNe. ... Clearly, much of the mass of the planetary nebula shell must remain un-ionized, and much of it may be in molecular form. ... The Magellanic Cloud PNe are ideal for this. ...

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The Sun Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic Evolution ... So far, one planet has been studied by this method. ...

Next: Optical spectrum of IRAS04296 Up: The peculiar post-AGB supergiant Previous: The peculiar post-AGB supergiant . This paper is a continuation of our series of papers on the investigation of stars which are believed to be in the post-Asymptotic Giant Branch (post-AGB) stage of evolution (Klochkova 1995; Zacs et al. ... Next: Optical spectrum of IRAS04296 Up: The peculiar post-AGB supergiant Previous: The peculiar post-AGB supergiant Klochkova V.G. 12/20/1999 ...

... Science Users Information > Science Activities > Science in Garching > Research Area: STELLAR STRUCTURE AND EVOLUTION . ... Reset view all 3 per page 5 per page 10 per page Sort by Title A-Z Title Z-A Date asc Date desc Research Topics Planets and Star Formation Stellar Structure and Evolution Stellar Populations Cosmology and the Early Universe Scientific Positions Faculty Fellows Scientists Students . ... Planets and Star Formation Stellar Populations Stellar Structure and Evolution Faculty . ...

... We suggest simple method of the selection of distant galaxies based on their radio properties. ... RC0015+0503a , RC0015+0503b , RC0015+0501 , RC0034+0513 , RC0038+0449 , RC0042+0504 . ... RC0105+0501 , RC0110+0500 , RC0117+0503 , RC0126+0502 , RC0133+0459 , RC0135+0450 , RC0137+0539 , RC0143+0505 , RC0152+0453 , RC0154+0459 , RC0159+0448 . ... RC0209+0501b , RC0213+0516 , RC0226+0512 , RC0250+0512 . ... RC0302+0456 , RC0308+0454 , RC0311+0507 , RC0318+0456 , RC0355+0449 . ...

... Galaxy Evolution home . ... Regulating the ISM and star formation . Cosmological evolution of star-forming galaxies . The origin and evolution of radio sources . Radio sources and their environments . ... Observations of the local Universe clearly demonstrate that very active star formation phases (starbursts) are often associated with interacting and merging galaxies and that in these systems much of the short wavelength emission is absorbed by dust and re-emitted in the IR. ...

... 361Condon Kaplan The 1.4 GHz NRAO VLA Sky Survey (NVSS) images and source catalog were used to detect radio emission from the 885 planetary nebulae north of J2000 declination $\delta = -40^\circ$ in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae. ... Total extinction coefficients $c$ at $\lambda = 4861$ \AA~were calculated for the 429 planetary nebulae with available H$\beta$ fluxes and low free-free optical depths at 1.4 GHz. ...

Stars form from interstellar clouds rich in hydrogen....they shine for billions of years, gradually converting hydrogen into helium....when hydrogen is exhausted, they need to find other energy sources....they expand to become giants and supergiants....low-mass stars expel planetary nebulae and become white dwarfs....high-mass stars explode as supernovae, leaving a neutron star or black hole behind. ... What can they tell us about normal stellar evolution ? ... WWW contact: webmaster@star.arm.ac.uk . ...

International Workshop NAROO-GAIA "A new reduction of old observations in the Gaia era", Paris Observatory, June 20-22, 2012 Registration of participants of Workshop NAROO-GAIA Before the first meeting OPENING OF THE WORKSHOP The natural planetary satellites are observed since centuries in order to understand their dynamics and their evolution. ... Science results, reports, data mining. ... L. Beauvalet: Strong need of a new reduction of Pluto's old observations W.Thuillot: very important. ...

CONSTRAINING LONG-TERM AND SPATIAL VARIABILITY OF THE PN LOW ENERGY RESPONSE WITH RXJ1856 (IUSS Pavia; INAF, IASF-Milano) In collaboration with: N. Sartore, S. Mereghetti, A. De Luca, R. Turolla, F. Haberl Andrea Tiengo RX J1856.5-3754 (RXJ1856) Brightest of the "Magnificent Seven", or X-ray Dim Isolated Neutron Stars (XDINSs) (e.g. Turolla 2009 f or a review) The closest known neutron star: d ~120 pc (W alter et al. ... 2011) Why studying RXJ1856 variability? ...

... A new bright LBV (Luminous Blue Variable) star was detected in M33 galaxy. LBV stars are the most massive stars in the final stages of evolution before exploding in of supernovae. ... The new LBV star (Fig.1) is the seventh in M33. ... It is one of the brightest LBV stars of the M33 galaxy. ... The brightest object is the core of the galaxy, - a compact star cluster comprising a supermassive black hole. The new LBV star N93351 is located down and to the left from the core. ...

Astronomy Picture of the Day . ... Explanation: Five hundred light years from Earth, in the constellation Aquarius , a sun-like star is dying. Its last few thousand years have produced the Helix , a well studied and nearby example of a Planetary Nebula - typical of this final phase of stellar evolution . The emission in this Infrared Space Observatory image of the Helix nebula comes mostly from the expanding shells of molecular hydrogen gas. ... Publications with keywords: infrared . ...

The Evolution of Galaxies to a Look-back Time of 4 Gyr -- RIG ====================================================== HI can be currently detected in emission from extragalactic objects out to a z~1/3, with integration times of order of 10 ksec at AO. ... The Sloan Digital Sky Survey (SDSS) is delivering optical photometry and spectroscopy for millions of galaxies. ... An even more ambitious effort, aimed at characterizing the evolution of galaxies back to 4 Gyr, will likely follow a few years hence. ...

... 329, P L1-L4 (1998). Abstract . ... 329, P L9-L12 (1998). ... 329, P L13-L16 (1998). ... 329, P L17-L19 (1998). ... 329, P 380-380 (1998). ... 329, P 87-100 (1998). ... 329, P 101-114 (1998). ... 329, P 115-130 (1998). ... 329, P 131-136 (1998). ... 329, P 137-146 (1998). ... 329, P 147-154 (1998). ... 329, P 155-160 (1998). ... 329, P 161-168 (1998). ... 329, P 169-185 (1998). ... 329, P 186-189 (1998). ... 329, P 190-198 (1998). ... 329, P 329-338 (1998). ... helpdesk@link.springer.de ...