Results 11 to 20 of about 27,938 (255)

A Preferred Orientation Angle for Bipolar Planetary Nebulae

Galaxies, 2020
We present preliminary results from measuring Galactic orientation angles of 766 elliptical and bipolar Planetary Nebulae (PNe) in the Hong Kong/Australian Astronomical Observatory/Strasbourg Observatory H-alpha Planetary Nebula research platform and ...
Andreas Ritter, Quentin A. Parker
doaj   +1 more source

ABOUT TEMPERATURE FIELDS AND CONDITIONS OF GASEOUS CONDENSATION OF NEBULAES IN THE PLANETARY VORTEX

Vìsnik Dnìpropetrovsʹkogo Unìversitetu: Serìâ Modelûvannâ, 2014
New exact solution of the spherically-axissymmetric Eiler's equations, called as plan­etary vortex, is applied to the problem of formation in planetary nebula germs of planets due to the condensation of gases in the areas of vortex instability which ...
L. V. Klyuchinskaya, V. I. Perechrect
doaj   +1 more source

The Real-Time Evolution of V4334 Sgr

Galaxies, 2018
V4334 Sgr (Sakurai’s object) is an enigmatic evolved star that underwent a very late thermal pulse a few years before its discovery in 1996. It ejected a new hydrogen-deficient nebula in the process. The source has been observed continuously since,
Peter A. M. van Hoof, Stefan Kimeswenger, Griet C. Van de Steene, Adam Avison, Albert A. Zijlstra, Lizette Guzman-Ramirez, Falk Herwig, Marcin Hajduk   +7 more
doaj   +1 more source

An HST Snapshot Survey of Proto-Planetary Nebulae Candidates: Two Types of Axisymmetric Reflection Nebulosities [PDF]

, 1999
We report the results from an optical imaging survey of proto-planetary nebula candidates using the HST. We exploited the high resolving power and wide dynamic range of HST and detected nebulosities in 21 of 27 sources.
Bakker E. J., Blocker T., Blommaert J. A. D. L., Bujarrabal V., Corradi R. L. M., Decin L., Dobashi K., Feast M. W., Garcia-Lario P., Garcia-Lario P., Geballe T. R., Gutler J., Hu J. Y., Hu J. Y., Hu J. Y., Iyengar K. V. K., Kahn F. D., Klochkova V. G., Le Bertre T., Likkel L., Lintel Hekkert P., Loup C., Manchado A., Margaret Meixner, Matthew Bobrowsky, Mellema G., Oudmaijer R. D., Parthasarathy M., Reddy B. E., Reddy B. E., Riera A., Schonberner D., Skinner C. J., Slijkhuis S., Smith V. V., Toshiya Ueta, Van der Veen W. E. C. J., Waelkens C., Waters L. B. F. M., Whitelock P. A., Zcs L.   +40 more
core   +4 more sources

Intracluster Planetary Nebulae [PDF]

Symposium - International Astronomical Union, 2003
We review the progress of research on intracluster planetary nebulae (IPN). In the past five years, hundreds of IPN candidates have been detected in the Virgo and Fornax galaxy clusters and searches are also underway in poorer galaxy groups. From the observations to date, and applying the known properties of extragalactic planetary nebulae, the ...
openaire   +6 more sources

SBS 1150+599A: an extremely oxygen-poor planetary nebula in the Galactic halo? [PDF]

, 2001
We report results of a spectrophotometric study of SBS 1150+599A and discuss the nature of this object based upon our data. Our study shows that SBS 1150+599A is most probably a planetary nebula located in the Galactic halo and not a cataclysmic variable
Aguilar, Allen, Aller, Aller, Anders, Balayan, Beers, Beers, Bełczynski, Bicay, Binette, Bobrowsky, Boesgaard, Bragaglia, Brocklehurst, C. Gutierrez, Charbonnel, Conlon, Dopita, Dopita, Drabek, Elitzur, F. Prada, Forestini, G. H. Tovmassian, G. Stasińska, Garnavich, Gratton, Henry, Howard, Ivans, Ivison, Izotov, Jacoby, Kingsburgh, Leitherer, Markarian, McGaugh, McWilliam, Mellema, Morris, Napiwotzki, Raimann, Richer, Richer, S. V. Zharikov, Salzer, Schwope, Skillman, Stasinska, Stasinska, Stepanian, V. H. Chavushyan, van den Bergh, Weideman, Weinberger, Weiss, Williams, Williams, Zickgraf   +59 more
core   +2 more sources

On a planetary nebula [PDF]

Astronomische Nachrichten, 1906
n ...
openaire   +2 more sources

Proto-Planetary Nebulae [PDF]

Annual Review of Astronomy and Astrophysics, 1993
The progress in the search for proto-planetary nebulae (PPN) in the last 5 years is reviewed. An observational definition of PPN is developed and a list of current PPN candidates is given. The optical, infrared, and radio properties of PPN are summarized and compared with theoretical models.
openaire   +3 more sources

SMC SMP 24: A Newly Radio-Detected Planetary Nebula in the Small Magellanic Cloud [PDF]

Serbian Astronomical Journal, 2010
In this paper we report a new radio-continuum detection of an extragalactic planetary nebula (PN): SMC~SMP~24. We show the radio-continuum image of this PN and present the measured radio data.
Bojicic, I. S., Filipovic, M. D., Crawford, E. J.   +2 more
doaj   +3 more sources

Birth and early evolution of a planetary nebula [PDF]

, 1998
The final expulsion of gas by a star as it forms a planetary nebula --- the ionized shell of gas often observed surrounding a young white dwarf --- is one of the most poorly understood stages of stellar evolution.
A Frank, A Frank, A Riera, G Mellema, IG Kolesnik, J Cantó, J Maddox, JR Kozok, JR Kozok, Kailash C. Sahu, KC Sahu, KG Henize, KG Henize, KJ Borkowski, KU Ratnatunga, LR Youngelson, M Bobrowsky, M Bobrowsky, M Livio, M Livio, M Morris, M Parthasarathy, M Parthasarathy, M. Parthasarathy, Matthew Bobrowsky, N Soker, Pedro García-Lario, S Casertano, S Kwok, SR Pottasch, T Blöcker, T Blöcker, V Icke, WA Feibelman   +33 more
core   +3 more sources