Results 61 to 70 of about 13,144 (210)

The abundance of SiS in circumstellar envelopes around AGB stars

, 2007
New SiS multi-transition (sub-)millimetre line observations of a sample of AGB stars with varying photospheric C/O-ratios and mass-loss rates are presented.
Agúndez, Bieging, Bieging, Boyle, Bujarrabal, Cherchneff, Duari, F. L. Schöier, Fonfría Expósito, Ford, Glassgold, González Delgado, Groenewegen, Groenewegen, H. Olofsson, Hasegawa, Höfner, Ivezic, J. Bast, Keady, Kerschbaum, Lindqvist, Lindqvist, Lucas, M. Lindqvist, Marvel, Melnick, Olofsson, Olofsson, Ramstedt, Scalo, Schöier, Schöier, Schöier, Schöier, Schöier, Schöier, Schöier, Suh, Tenenbaum, van Zadelhoff, Willacy, Willacy, Wirsich, Woitke, Woods   +45 more
core   +1 more source

Relation between the luminosity of young stellar objects and their circumstellar environment [PDF]

, 2006
We present a new model-independent method of comparison of NIR visibility data of YSOs. The method is based on scaling the measured baseline with the YSO's distance and luminosity, which removes the dependence of visibility on these two variables. We use
Bibo E. A., Chavarria K., C., Chini R., Claria J. J., Clarke C. J., de Lara E., Dejan Vinković, Dorschner J., Drew J. E., Finkenzeller U., Friedemann C., Friedjung M., Fuente A., Grady C. A., Grinin V. P., Hutchinson M. G., Ivezic, Ivezic, Lynden-Bell D., Miroshnichenko A., Natta A., Porter J. M., Shevchenko V. S., Sitko M. L., Straizys V., Terranegra L., Tomislav Jurkić, van den Ancker M. E., van den Ancker M. E.   +28 more
core   +2 more sources

Insights Into the Gas‐Phase Structure and Internal Dynamics of Diphenylsilane: A Broadband Rotational Spectroscopy Study

ChemPhysChem, Volume 26, Issue 2, January 14, 2025.
The structure of diphenylsilane could be determined from the rotational spectra of all its singly substituted heavy atom isotopologues. A comparison with its oxygen analogue diphenylether revealed some interesting differences in the internal dynamics as well as in the gas‐phase structure.
Gayatri Batra, Melanie Schnell
wiley   +1 more source

Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514

The Astrophysical Journal Letters
We report the discovery of CO _2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remains stable over
Kate Y. L. Su, Attila Moór, Chengyan Xie, Ilaria Pascucci, George H. Rieke, Ágnes Kóspál, Mark C. Wyatt, Péter Ábrahám, Luca Matrà, Zoe Roumeliotis, D. J. Wilner   +10 more
doaj   +1 more source

First direct detection of large polycyclic aromatic hydrocarbons on asteroid (162173) Ryugu samples: An interstellar heritage

Natural Sciences, Volume 4, Issue 4, October 2024.
Large free aromatic species, with up to 61 carbon atoms, were detected in grains of the Ryugu carbonaceous asteroid using ultra‐sensitive two‐step laser mass spectrometry. This discovery confirms the presence of large polycyclic aromatic hydrocarbons in the interstellar medium and provides new information on the formation and evolution of organic ...
Hassan Sabbah, Ghylaine Quitté, Karine Demyk, Christine Joblin   +3 more
wiley   +1 more source

Near-infrared Integral-field Spectroscopy of the Wind Forming Region of CW Leo

The Astronomical Journal
The circumstellar envelope of the carbon star CW Leo exhibited various unexpected changes in recent optical imaging observations. We have performed a follow-up observation using the Near-infrared Integral-Field Spectrograph (NIFS) equipped on the Gemini ...
Hyosun Kim, Youichi Ohyama, Ho-Gyu Lee, Ji Hoon Kim   +3 more
doaj   +1 more source

The Ionization Energies of Dust-Forming Metal Oxide Clusters

Universe, 2021
Stellar dust grains are predominantly composed of mineralic, anorganic material forming in the circumstellar envelopes of oxygen-rich AGB stars. However, the initial stage of the dust synthesis, or its nucleation, is not well understood.
David Gobrecht, Jan Philip Sindel, Helena Lecoq-Molinos, Leen Decin   +3 more
doaj   +1 more source

Circumstellar molecular line emission from S-type AGB stars: Mass-loss rates and SiO abundances

, 2009
The main aim is to derive reliable mass-loss rates and circumstellar SiO abundances for a sample of 40 S-type AGB stars based on new multi-transitional CO and SiO radio line observations.
Bieging, Bieging, Chen, Cherchneff, Cotton, Danchi, F. L. Schöier, González Delgado, Groenewegen, Groenewegen, Groenewegen, Groenewegen, H. Olofsson, Huggins, Höfner, Höfner, Ivezic, Jorissen, Jura, Justtanont, Kahane, Knapp, Kwok, Lindqvist, Nyman, Olofsson, Olofsson, Ramstedt, Ramstedt, Reid, Reid, S. Ramstedt, Sahai, Salpeter, Scalo, Schöier, Schöier, Schöier, Schöier, Schöier, Schöier, Schöier, Stanek, Stephenson, Stephenson, Suh, van der Tak, Volk, Whitelock, Willems, Wing, Woitke, Young   +52 more
core   +1 more source

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

The Unusual Spitzer Spectrum of the Carbon Star IRAS 04496–6958: A Different Condensation Sequence in the LMC? [PDF]

, 2006
We present a new Spitzer Infrared Spectrograph (IRS) spectrum of the carbon star IRAS 04496-6958 in the Large Magellanic Cloud, which exhibits a fairly broad absorption feature at ~11 μm.
Cami, Jan, Dijkstra, Catharinus, Kemper, Ciska, Leisenring, Jarron, Markwick-Kemper, Ciska, Meixner, Margaret, Speck, Angela K., Szczerba, Ryszard, Van Dyk, Schuyler   +8 more
core   +1 more source