Results 21 to 30 of about 55,496 (241)

High-resolution optical spectroscopy of the F supergiant protoplanetary nebula IRAS 18095+2704 [PDF]

, 2010
An abundance analysis is presented for IRAS 18095+2704 (V887 Her), a post-asymptotic giant branch star and protoplanetary nebula. The analysis is based on high-resolution optical spectra from the McDonald Observatory and the Special Astrophysical ...
T. Şahin, D. Lambert, V. Klochkova, N. Tavolganskaya   +3 more
semanticscholar   +3 more sources

High-resolution Pan-STARRS and SMA Observations of IRAS 23077+6707: A Giant Edge-on Protoplanetary Disk [PDF]

The Astrophysical Journal Letters
We present resolved images of IRAS 23077+6707 (“Dracula’s Chivito”) in 1.3 mm/225 GHz thermal dust and CO gas emission with the Submillimeter Array (SMA) and optical (0.5–0.8 μ m) scattered light with the Panoramic Survey Telescope and Rapid Response ...
Kristina Monsch, Joshua Bennett Lovell, Ciprian T. Berghea, Gordian Edenhofer, Garrett K. Keating, Sean M. Andrews, Ammar Bayyari, Jeremy J. Drake, David J. Wilner   +8 more
doaj   +2 more sources

Herschel/HIFI observations of molecular emission in protoplanetary nebulae and young planetary nebulae [PDF]

Astronomy & Astrophysics, 2011
We performed Herschel/HIFI observations of intermediate-excitation molecular lines in the far-infrared/submillimeter range in a sample of ten protoplanetary nebulae and young planetary nebulae.
A. de Koter, A. P. Marston, Alcolea, Alcolea, Balick, Bujarrabal, Bujarrabal, Bujarrabal, Bujarrabal, Bujarrabal, C. Dominik, Castro-Carrizo, Castro-Carrizo, Castro-Carrizo, Castro-Carrizo, Cox, D. A. Neufeld, D. Teyssier, de Graauw, Dinh-V-Trung, F. L. Schöier, Fong, G. Melnick, H. Olofsson, Hoogzaad, J. Alcolea, J. Cernicharo, Justtanont, K. Justtanont, K. M. Menten, L. B. F. M. Waters, L. Decin, M. Schmidt, Martin-Pintado, Nakashima, Nakashima, P. Planesas, Pardo, Peretto, Pilbratt, R. Soria-Ruiz, R. Szczerba, Sahai, Sanchez Contreras, Sánchez Contreras, V. Bujarrabal   +45 more
core   +8 more sources

JWST Imaging of Edge-on Protoplanetary Disks. III. Drastic Morphological Transformation Across the Mid-infrared in Oph163131 [PDF]

The Astrophysical Journal
We present JWST broadband images of the highly inclined protoplanetary disk SSTc2d J163131.2-242627 (Oph163131) from 2.0 to 21 μ m. The images show a remarkable evolution in disk structure with wavelength, quite different from previous JWST observations ...
Marion Villenave, Karl R. Stapelfeldt, Gaspard Duchêne, François Ménard, Marshall D. Perrin, Christophe Pinte, Schuyler G. Wolff, Ryo Tazaki, Deborah L. Padgett   +8 more
doaj   +2 more sources

A MOLECULAR LINE SURVEY OF THE CARBON-RICH PROTOPLANETARY NEBULA AFGL 2688 IN THE 3 mm AND 1.3 mm WINDOWS [PDF]

, 2013
We present a spectral line survey of the protoplanetary nebula (PPN) AFGL 2688 in the frequency ranges of 71–111 GHz, 157–160 GHz, and 218–267 GHz using the Arizona Radio Observatory 12 m telescope and the Heinrich Hertz Submillimeter Telescope.
Y. Zhang 张, S. Kwok 郭, Jun-ichi 淳一 Nakashima 中岛, Wayne Chau, Dinh-V-Trung   +4 more
semanticscholar   +2 more sources

DETECTION OF C60 IN THE PROTOPLANETARY NEBULA IRAS 01005+7910 [PDF]

, 2011
We report the first detection of buckminsterfullerene (C60) in a protoplanetary nebula. The vibrational transitions of C60 at 7.0, 17.4, and 18.9 μm are detected in the Spitzer/Infrared Spectrograph spectrum of IRAS 01005+7910.
Yong Zhang, S. Kwok
semanticscholar   +3 more sources

HST observations of the protoplanetary nebula OH 231.8+4.2: The structure of the jets and shocks [PDF]

, 2002
We present high-resolution images obtained with the WFPC2, on board the HST, of the protoplanetary nebula (PPN) OH 231.8+4.2. H and NII line emission and scattered light in the continuum at 6750 and 7910 A were observed. We also discuss NIR NICMOS images
V. Bujarrabal, J. Alcolea, C. Contreras, R. Sahai   +3 more
semanticscholar   +2 more sources

Clumpy Flows in Protoplanetary and Planetary Nebulae [PDF]

arXiv, 2003
Many astrophysical flows occur in inhomogeneous media. We briefly discuss some general properties of the adiabatic and radiative inhomogeneous systems and discuss the relevance of those properties to the planetary nebulae systems. We then focus on radiative hypersonic bullets and the applicability of this model to planetary and protoplanetary systems ...
Poludnenko, A. Y., Frank, A., Mitran, S.
arxiv   +3 more sources

AN ASYMMETRIC JET-LAUNCHING MODEL FOR THE PROTOPLANETARY NEBULA CRL 618 [PDF]

The Astrophysical Journal, 2014
We propose an asymmetrical jet-ejection mechanism in order to model the mirror symmetry observed in the lobe distribution of some protoplanetary nebulae (pPNs), such as the pPN CRL 618.
P. Velázquez, A. Riera, A. Raga, J. C. Toledo-Roy   +3 more
semanticscholar   +5 more sources

REEXAMINING THE CHEMISTRY IN PROTOPLANETARY NEBULAE: M1-92, COTTON CANDY NEBULA, AND IRAS22036

Proceedings of the 2022 International Symposium on Molecular Spectroscopy, 2022
Katherine Gold, L. Ziurys, D. Schmidt
semanticscholar   +3 more sources