Results 111 to 120 of about 55,649 (206)

Molecular Line Studies of Circumstellar Envelopes

, 1982
This dissertation addresses several problems in the study of the dusty, gaseous envelopes commonly found around highly evolved stars. Most of the objects observed are M or N giants and are typically long-period variables.
Jewell, Philip Ramer
core  

Abundance of Ammonia in Carbon-rich Asymptotic Giant Branch Stars as Observed by Herschel/HIFI—A Rotational Diagram Approach

The Astrophysical Journal
The Herschel Heterodyne Instrument for the Far-Infrared (HIFI) obtained high-resolution spectroscopic observations of numerous Galactic and extragalactic sources, including 12 carbon-rich (C-rich) Galactic asymptotic giant branch (AGB) stars.
Ryszard Szczerba, Xiaohu Li, Juan Tuo, Mirosław R. Schmidt, Tom J. Millar, Gleb Fedoseev, Jixing Ge, Wasim Iqbal, Yong Zhang, Chuanlu Yang, Tao Yang, Xuan Fang, Cheng Zhu, Yihan Wu, Rong Ma, Xia Zhang, Xiaomin Song, Fangfang Li, Yuxuan Sun, Qixin Wu, Wenzhong Cai, Qing-Guo Sun, Yanan Feng, Jianchao Yang   +23 more
doaj   +1 more source

Phosphorus-bearing molecules PO and PN at the edge of the Galaxy. [PDF]

Nature, 2023
Koelemay LA, Gold KR, Ziurys LM.
europepmc   +1 more source

Unconventional gas-phase preparation of the prototype polycyclic aromatic hydrocarbon naphthalene (C₁₀H₈) via the reaction of benzyl (C₇H₇) and propargyl (C₃H₃) radicals coupled with hydrogen-atom assisted isomerization. [PDF]

Chem Sci, 2023
He C, Kaiser RI, Lu W, Ahmed M, Krasnoukhov VS, Pivovarov PS, Zagidullin MV, Azyazov VN, Morozov AN, Mebel AM.   +9 more
europepmc   +1 more source

H2S In Agb Circumstellar Envelopes

, 2017
N ...
openaire   +2 more sources

Dance to Demise—How Massive Stars May Form Dense Circumstellar Shells before Explosion

The Astrophysical Journal
We investigate the evolution of red supergiant (RSG) progenitors of core-collapse supernovae (SNe) with initial masses between 12 and 20 M _⊙ , focusing on the effects of enhanced mass loss due to pulsation-driven instabilities in their envelopes and ...
Sutirtha Sengupta, Das Sujit, Arkaprabha Sarangi   +2 more
doaj   +1 more source

Al-26 and circumstellar envelopes

The Astrophysical Journal, 1995
The effects of the radioactive decay of Al-26 on the circumstellar envelopes of asymptotic giant branch stars are analyzed. The gamma-rays emitted by the product nucleus Mg-26 escape most envelopes, but the beta-decay positrons are stopped and can ionize and heat the gas.
openaire   +1 more source

Modern Construction Envelopes

, 2014
The second edition of Modern Construction Envelopes was originally based on the two books by Watts, MC Roofs and MC Facades. Both volumes were gathered into one single volume. Using current examples by renowned architects, Watts presents the constructive
Watts, Andrew
core  

Investigating Asymmetry Development from SiO to H2O Maser Regions in VX Sagittarii

The Astronomical Journal
Simultaneous very-long-baseline interferometry monitoring observations of H _2 O and SiO masers toward VX Sagittarii were conducted from 2014 February to 2019 January.
Dong-Hwan Yoon, Se-Hyung Cho, Youngjoo Yun, Haneul Yang, Jaeheon Kim   +4 more
doaj   +1 more source

Calcium Chemistry in Carbon-rich Circumstellar Environments: The Laboratory and Astronomical Discovery of Calcium Dicarbide, CaC2

The Astrophysical Journal Letters
Calcium dicarbide, CaC _2 , has been characterized at high resolution in the laboratory, and its main isotopologue, ^40 CaC _2 , has been assigned to 14 rotational emission lines between 14 and 115 GHz, including 12 previously unassigned lines, in the ...
H. Gupta, P. B. Changala, J. Cernicharo, J. R. Pardo, M. Agúndez, C. Cabezas, B. Tercero, M. Guélin, M. C. McCarthy   +8 more
doaj   +1 more source