Results 131 to 140 of about 3,278,550 (239)

Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars

Galaxies
We summarise the properties and nature of a peculiar group of B-type stars called FS CMa stars. These stars show the B[e] phenomenon, i.e., their spectra exhibit both forbidden emission lines and infrared excess.
Daniela Korčáková, Nela Dvořáková, Iris Bermejo Lozano, Gregg A. Wade, Alicia Moranchel Basurto, Pavel Kroupa, Raul Ortega Chametla, Colin Peter Folsom, Ondrej Juhás   +8 more
doaj   +1 more source

Discovery of a Shell of Neutral Atomic Hydrogen Surrounding the Carbon Star IRC+10216

, 2015
We have used the Robert C. Byrd Green Bank Telescope to perform the most sensitive search to date for neutral atomic hydrogen (HI) in the circumstellar envelope (CSE) of the carbon star IRC+10216.
Bertre, T. Le, Gerard, E., Matthews, L. D.   +2 more
core   +3 more sources

Gas-phase Molecules in Protoplanetary Nebulae with the 21 μm Emission Feature. II. Carbon Monosulfide

The Astronomical Journal
The carrier of the 21 μ m emission feature discovered in a handful of protoplanetary nebulae (PPNe) is one of the most intriguing enigmas in circumstellar chemistry.
Jian-Jie Qiu, Yong Zhang, Deng-Rong Lu, Zheng-Xue Chang, Jiang-Shui Zhang, Xiao-Hu Li, Xin-Di Tang, Yisheng Qiu, Jun-ichi Nakashima, Lan-Wei Jia   +9 more
doaj   +1 more source

High ions towards white dwarfs: circumstellar line shifts and stellar temperature

, 2011
Based on a compilation of OVI, CIV, SiIV and NV data from IUE, FUSE, GHRS, STIS, and COS, we derive an anti- correlation between the stellar temperature and the high ion velocity shift w.r.t. to the photosphere, with positive (resp.
B. Y. Welsh, Ballet, Bannister, Barstow, Barstow, Barstow, Barstow, Borkowski, Bruhweiler, Christian, Cox, Dalton, Dupree, Dupuis, Farihi, Farihi, Farihi, Finley, Gnat, Holberg, Holberg, Holberg, Kilic, Knauth, Koester, Koutroumpa, Lallement, Landsman, Lehner, M. A. Barstow, Marsh, Melis, Oegerle, Peek, R. Lallement, Redfield, S. L. Casewell, Saffer, Savage, Slavin, Slavin, Vennes, Vennes, Vennes, Vergely, Welsh, Welsh, Welsh, Welsh, Werner, Zuckerman   +50 more
core   +2 more sources

Detection of H_2 Pure Rotational Line Emission from the GG Tauri Binary System [PDF]

, 1999
We present the first detection of the low-lying pure rotational emission lines of H_2 from circumstellar disks around T Tauri stars, using the Short Wavelength Spectrometer on the Infrared Space Observatory.
Blake, Geoffrey A., Hogerheijde, Michiel R., Thi, Wing-Fai, van Dishoeck, Ewine F., van Zadelhoff, Gerd-Jan   +4 more
core  

Effects of Metallicity on Graphite, TiC, and SiC Condensation in Carbon Stars

The Astrophysical Journal
From transmission electron microscopy and other laboratory studies of presolar grains, the implicit condensation sequence of carbon-bearing condensates in circumstellar envelopes of carbon stars is (from first to last) TiC-graphite-SiC.
Gabrielle M. Adams, Katharina Lodders
doaj   +1 more source

Emission processes and dynamics of hot gases in astrophysics [PDF]

A detailed model was developed for Kepler's supernova remnant (SNR). Observations of the SNR revealed a strong interaction with the surrounding circumstellar medium, which was studied through both analytical and numerical calculations.
Chevalier, Roger A., Sarazin, Craig L.
core   +1 more source

Shape and evolution of wind-blown bubbles of massive stars: on the effect of the interstellar magnetic field

, 2015
The winds of massive stars create large (>10 pc) bubbles around their progenitors. As these bubbles expand they encounter the interstellar coherent magnetic field which, depending on its strength, can influence the shape of the bubble.
Marcowith, Alexandre, Meliani, Zakaria, van Marle, Allard Jan   +2 more
core   +3 more sources

Recurrent Planet Formation and Intermittent Protostellar Outflows Induced by Episodic Mass Accretion

, 2011
The formation and evolution of a circumstellar disk in magnetized cloud cores is investigated from prestellar core stage until sim 10^4 yr after protostar formation.
Banerjee, Bate, Bate, Bodenheimer, Crutcher, Dunham, Durisen, D’Angelo, Enoch, Enoch, Evans, Goodwin, Hayashi, Inutsuka, Kley, Larson, Machida, Machida, Machida, Machida, Machida, Machida, Machida, Machida, Masahiro N. Machida, Masunaga, Matsumoto, Matsumoto, Matsumoto, Nakano, Saigo, Shu, Shu-ichiro Inutsuka, Tassis, Tassis, Tassis, Thalmann, Tomisaka, Tomoaki Matsumoto, Truelove, Vorobyov, Vorobyov, Vorobyov   +42 more
core   +1 more source

Spectroscopic Identification and Photochemistry of Astrochemically Relevant Phosphorus-bearing Molecules [O, C, N, P] and [2O, C, N, P]

The Astrophysical Journal
Diatomic molecules phosphorus monoxide (PO) and phosphorus mononitride (PN) are the main reservoirs of gas-phase phosphorus in interstellar and circumstellar environments, indicating the possibility of forming new phosphorus-bearing molecules through ...
Bifeng Zhu, Minghao Wang, Junjie Jiang, Ningjing Jiang, Jingling Hong, Guntram Rauhut, Guanjun Wang, Weixing Li, Xiaoqing Zeng   +8 more
doaj   +1 more source