Results 81 to 90 of about 17,929 (222)

Gas-phase Molecules in Protoplanetary Nebulae with the 21 μm Emission Feature

The Astronomical Journal
It has been more than 30 years since the enigmatic 21 μ m emission feature was first discovered in protoplanetary nebulae (PPNs). Although dozens of different dust carrier candidates have been proposed, there is as yet no widely accepted one.
Jian-Jie Qiu, Yong Zhang, Jun-ichi Nakashima, Jiang-Shui Zhang, Fei Li, Deng-Rong Lu, Xin-Di Tang, Xiao-Ling Yu, Lan-Wei Jia   +8 more
doaj   +1 more source

Circumstellar matter, with particular reference to jets and molecular flows [PDF]

Symposium - International Astronomical Union, 1987
Circumstellar matter exists in many forms, such as winds from early and from late type stars, in infra-red sources and OH and H2O masers, in X-ray sources and jets, and molecular flows and Herbig-Haro objects. There is considerable diversity in the nature of the starlike bodies that underlie these phenomena.
openaire   +2 more sources

Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro‐ to nano‐scale

Meteoritics &Planetary Science, Volume 59, Issue 8, Page 2023-2043, August 2024.
Abstract Transmission electron microscopy analyses of Hayabusa2 samples show that Ryugu organic matter exhibits a range of morphologies, elemental compositions, and carbon functional chemistries consistent with those of carbonaceous chondrites that have experienced low‐temperature aqueous alteration.
Rhonda M. Stroud, Jens Barosch, Lydie Bonal, Katherine Burgess, George D. Cody, Bradley T. De Gregorio, Luke Daly, Emmanuel Dartois, Elena Dobrică, Jean Duprat, Cecile Engrand, Dennis Harries, Minako Hashiguchi, Hope Ishii, Yoko Kebukawa, A. David Kilcoyne, Falko Langenhorst, Martin R. Lee, Larry R. Nittler, Eric Quirico, Taiga Okumura, Laurent Remusat, Scott Sandford, Hikaru Yabuta, Masanao Abe, Neyda M. Abreu, Paul A. J. Bagot, Pierre Beck, Laure Bejach, Phil A. Bland, John C. Bridges, Brittany A. Cymes, Alexandre Dazzi, Francisco de la Peña, Ariane Deniset‐Besseau, Satomi Enju, Yuma Enokido, David R. Frank, Jennifer Gray, Mitsutaka Haruta, Satoshi Hata, Leon Hicks, Yohei Igami, Damien Jacob, Kanami Kamide, Mutsumi Komatsu, Sylvain Laforet, Hugues Leroux, Corentin Le Guillou, Zita Martins, Maya Marinova, James Martinez, Jérémie Mathurin, Megumi Matsumoto, Toru Matsumoto, Junya Matsuno, Samuel McFadzean, Tatsuhiro Michikami, Itaru Mitsukawa, Akira Miyake, Masaaki Miyahara, Akiko Miyazaki, Gilles Montagnac, Smail Mostefaoui, Tomoki Nakamura, Aiko Nakato, Hiroshi Naraoka, Yusuke Nakauchi, Satoru Nakazawa, Masahiro Nishimura, Takaaki Noguchi, Kenta Ohtaki, Takuji Ohigashi, Tatsuaki Okada, Shota Okumura, Ryuji Okazaki, Thi H. V. Phan, Rolando Rebois, Kanako Sakamoto, Takanao Saiki, Hikaru Saito, Yusuke Seto, Miho Shigenaka, William Smith, Hiroki Suga, Mingqi Sun, Shogo Tachibana, Yoshio Takahashi, Yasuo Takeichi, Akihisa Takeuchi, Aki Takigawa, Yusuke Tamenori, Satoshi Tanaka, Fuyuto Terui, Michelle S. Thompson, Naotaka Tomioka, Akira Tsuchiyama, Yuichi Tsuda, Kentaro Uesugi, Masayuki Uesugi, Tomohiro Usui, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Sei‐ichiro Watanabe, Toru Yada, Shohei Yamashita, Masahiro Yasutake, Kasumi Yogata, Makoto Yoshikawa, Hisayoshi Yurimoto, Pierre‐M. Zanetta, Thomas Zega, Michael E. Zolensky   +112 more
wiley   +1 more source

Effect of Matter Accretion on Lithium Enhancement of Giants

The Astrophysical Journal
A subset of low-mass giants (
Xue-Feng Li, Jian-Rong Shi, Yan Li, Hong-Liang Yan, Jing-Hua Zhang, Fei Guo   +5 more
doaj   +1 more source

Multi-dimensional models of circumstellar shells around evolved massive stars

, 2012
Massive stars shape their surrounding medium through the force of their stellar winds, which collide with the circumstellar medium. Because the characteristics of these stellar winds vary over the course of the evolution of the star, the circumstellar ...
Keppens, Rony, van Marle, Allard Jan
core   +1 more source

The circumstellar disc in the Bok globule CB 26: Multi-wavelength observations and modelling of the dust disc and envelope [PDF]

, 2009
Circumstellar discs are expected to be the nursery of planets. Grain growth within such discs is the first step in the planet formation process. The Bok globule CB 26 harbours such a young disc.
Alonso-Albi, Beckwith, Beelen, Bjorkman, C. Pinte, C.-E. McCabe, Cardelli, D'Alessio, D. L. Padgett, Draine, Draine, Draine, Draine, Duchêne, Eisner, Engelbracht, Evans, Evans, F. Ménard, G. Duchêne, Gammie, Glauser, Gordon, Guilloteau, Guilloteau, Gullbring, Ho, Hughes, J. Sauter, J.-H. Chen, K. Pontoppidan, K. R. Stapelfeldt, Kessler-Silacci, Kokubo, Kovács, Launhardt, Launhardt, Lucy, M. Dunham, Mathis, Natta, Ossenkopf, Pety, Pinte, R. Launhardt, S. Wolf, Scoville, Shakura, Stansberry, Stapelfeldt, Stapelfeldt, Stecklum, T. L. Bourke, Toomre, Ulrich, Voshchinnikov, Watson, Weingartner, Whitney, Wolf, Wolf, Wolf, Wolf, Wolf, Wood   +64 more
core   +4 more sources

Barotropic thin shells with linear EOS as models of stars and circumstellar shells in general relativity [PDF]

, 1999
The spherically symmetric thin shells of the barotropic fluids with the linear equation of state are considered within the frameworks of general relativity.
Coleman S., Hájíček P., KONSTANTIN G. ZLOSHCHASTIEV, Laguna-Castillo P., Witten E.   +4 more
core   +2 more sources

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +1 more source

SN 2022jox: An Extraordinarily Ordinary Type II SN with Flash Spectroscopy

The Astrophysical Journal
We present high-cadence optical and ultraviolet (UV) observations of the Type II supernova (SN), SN 2022jox which exhibits early spectroscopic high-ionization flash features of H i , He ii , C iv , and N iv that disappear within the first few days after ...
Jennifer E. Andrews, Jeniveve Pearson, Griffin Hosseinzadeh, K. Azalee Bostroem, Yize Dong, Manisha Shrestha, Jacob E. Jencson, David J. Sand, S. Valenti, Emily Hoang, Daryl Janzen, M. J. Lundquist, Nicolás Meza, Samuel Wyatt, Saurabh W. Jha, Chris Simpson, Joseph Farah, Estefania Padilla Gonzalez, D. Andrew Howell, Curtis McCully, Megan Newsome, Craig Pellegrino, Giacomo Terreran   +22 more
doaj   +1 more source

On the Circumstellar Matter Distribution around Herbig Ae/Be Stars

The Astrophysical Journal, 1997
The spectral energy distributions (SEDs) observed in Herbig Ae/Be stars are critically analyzed in connection with a spherically symmetric model for matter distribution around the central objects. The possibility that the dusty component is described by an MRN-DL mixture (see the work of Mathis, Rumpl, and Nordsiek; Draine and Lee) and is constituted ...
PEZZUTO S., STRAFELLA, Francesco, LORENZETTI D.   +2 more
openaire   +2 more sources