Results 31 to 40 of about 23,039 (206)

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

Analysis of Multiple Shell Planetary Nebulae Based on HST/WFPC2 Extended 2D Diagnostic Diagrams

Galaxies, 2018
The investigation of gaseous nebulae, emitting in forbidden lines, is often based extensively on diagnostic diagrams. The special physics of these lines often allows for disentangling with a few line ratios normally coupled thermodynamic parameters like ...
Daniela Barría, Stefan Kimeswenger
doaj   +1 more source

New groups of planetary nebulae with peculiar dust chemistry towards the Galactic bulge

, 2010
We investigate Galactic bulge planetary nebulae without emission-line central stars for which peculiar infrared spectra have been obtained with the Spitzer Space Telescope, including the simultaneous signs of oxygen and carbon based dust.
Blöcker, Cerrigone, Chiappini, Cohen, Cohen, Costa, Cuisinier, D. A. García-Hernández, de Marco, Durand, Escudero, Escudero, Exter, García-Hernández, García-Lario, Gesicki, Gesicki, Gesicki, Gutenkunst, Górny, Górny, Górny, Górny, Herwig, Houck, Hultzsch, J. V. Perea-Calderón, Köppen, Leisy, Miszalski, Molster, P. García-Lario, Perea-Calderón, Peña, R. Szczerba, Ratag, Richer, Robinson, S. K. Górny, Samland, Stanghellini, Stasinska, Stasinska, Szczerba, Tylenda, Uttenthaler, van Hoof, Wang, Waters, Waters, Werner, Zoccali   +51 more
core   +1 more source

PLANETARY NEBULAE

Emerging Minds Journal for Student Research, 2023
This project compares two planetary nebulae (NGC 1514 and NGC 40) and studies the difference between them in their chemical composition. Observations of the two planetary nebulae were done at Clanfield Observatory with the 24-inch Ritchey-Chrétien telescope.
openaire   +1 more source

Planetary Nebulae Research: Past, Present, and Future

Galaxies
We review the evolution of our understanding of the planetary nebulae phenomenon and their place in the scheme of stellar evolution. The historical steps leading to our current understanding of central star evolution and nebular formation are discussed ...
Sun Kwok
doaj   +1 more source

Gaia DR2 Distances to Planetary Nebulae

Galaxies, 2020
The aim of this work is to examine distances to planetary nebulae (PNe) together with other properties that were derived from them, using the astrometry of Gaia Data Release 2 (DR2).
Iker González-Santamaría, Minia Manteiga, Arturo Manchado, Ana Ulla, Carlos Dafonte   +4 more
doaj   +1 more source

The Search for Binaries in Post-Asymptotic Giant Branch Stars: Do Binary Companions Shape the Nebulae? [PDF]

Journal of Astronomy and Space Sciences, 2012
Binary companions are often invoked to explain the axial and point symmetry seen in the majority of planetary nebulae and proto-planetary nebulae (PPNs).
Bruce J. Hrivnak
doaj   +1 more source

In Search of Possible Associations between Planetary Nebulae and Open Clusters

, 2007
We consider the possibility of cluster membership for 13 planetary nebulae that are located in close proximity to open clusters lying in their lines of sight.
Akhundova G. V., Andrews A. D., Barkhatova K. A., Bertelli G., Burki G., Cahn J. H., Cazetta J. O., Cuisinier F., Cutri R. M., Dambis A. K., Daniel J. Majaess, David G. Turner, David J. Lane, Glushkova E. V., Glushkova E. V., Hasegawa T., Jennens P. A., Kholopov P. N., Koester D., Kwok S., Mal'kov Y. F., Mallik D. C. V., Mermilliod J.-C., Mermilliod J.-C., Meynet G., Moffat A. F. J., Moitinho A., Neckel Th., Osterbrock D. E., Pena M., Peton-Jonas D., Svolopoulos S. N., Tifft W. G., Turner D. G., Tylenda R., Walker A. R., Weidemann V., Zijlstra A. A., Ziznovsky J.   +38 more
core   +1 more source

A Mid-Infrared Imaging Survey of Proto-Planetary Nebula Candidates [PDF]

, 1998
We present the data from a mid-infrared imaging survey of 66 proto-planetary nebula candidates using two mid-IR cameras (MIRAC2 and Berkcam) at the NASA Infrared Telescope Facility and the United Kingdom Infrared Telescope.
Aditya Dayal, Arens J. F., Bruce J. Hrivnak, Christopher J. Skinner, Cohen M., Giovanni Fazio, Hu J. Y., Hu J. Y., Hu J. Y., Hutsemekers D., Iyengar K. V. K., Joseph L. Hora, Likkel L., Loup C., Lynne K. Deutsch, Manchado A., Margaret Meixner, Mauron N., Olnon F. M., Omont A., Oudmaijer R. D., Silva A. M., Skinner C. J., Te Lintel Hekkert P., Toshiya Ueta, van der Veen W. E. C. J., Waters L. B. F. M., William F. Hoffmann, Zijlstra A. A.   +28 more
core   +2 more sources

CO in Planetary Nebulae [PDF]

The Astrophysical Journal, 1987
We report the first detection of millimeter CO emission in two highly evolved planetary nebulae: NGC 6720 and NGC 7293. The CO is a useful probe of the structure and kinematics of the molecular gas in the nebulae, and provides an estimate of the mass of material which remains un-ionized by the central star.
P. J. Huggins, A. P. Healy
openaire   +1 more source