Results 41 to 50 of about 1,290 (180)

A Hydrodynamical Model of a Rotating Wind Source and Its Effects on the Collapse of a Rotating Core

Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015
This work presents three‐dimensional hydrodynamical simulations with the fully parallel GAGDET2 code, to model a rotating source that emits wind in order to study the subsequent dynamics of the wind in three independent scenarios. In the first scenario we consider several models of the wind source, which is characterized by a rotation velocity Vrot and
Guillermo Arreaga-Garcia, Elmetwally Elabbasy   +1 more
wiley   +1 more source

Star Formation near Photodissociation Regions: Detection of a Peculiar Protostar near Cederblad 201 [PDF]

The Astrophysical Journal, 2008
We present the detection and characterization of a peculiar low-mass protostar (IRAS 22129+7000) located ~0.4 pc from Ced 201 Photodissociation Region (PDR) and ~0.2 pc from the HH450 jet. The cold circumstellar envelope surrounding the object has been mapped through its 1.2 mm dust continuum emission with IRAM-30m/MAMBO.
Goicoechea, Javier R., Berné, Olivier, Gerin, Maryvonne, Joblin, Christine, Teyssier, David   +4 more
openaire   +3 more sources

Temperaments of young stars : rapid mass accretion rate changes in T Tauri and Herbig Ae stars

, 2014
Funding: JSV would like to thank the UK Science and Technologies Facility Council (STFC) and the Northern Ireland Department of Culture Arts and Leisure (DCAL) for financial support.
G. Costigan, Jorick S. Vink, Vink, Jorick S., Ray, T., Testi, L., A. Scholz, T. Ray, L. Testi, Scholz, A., Costigan, G.   +9 more
core   +1 more source

Physicochemical Constraints on the Abiotic Polymerization of Nucleotides Into RNA

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 11, November 2025.
Abstract One of the key steps in the origin of life is the polymerization of nucleotides into nucleic acids like RNA. We have quantified the energetic impact of temperature, pressure, and composition on the polymerization of nucleotides into RNA using the Gibbs function. These Gibbs energies have been used to calculate the probability that a nucleotide
D. E. LaRowe, J. M. Dick
wiley   +1 more source

Protostars in the Elephant Trunk Nebula

, 2004
International audienceThe optically-dark globule IC 1396A is revealed using Spitzer images at 3.6, 4.5, 5.8, 8, and 24 microns to be infrared-bright and to contain a set of previously unknown protostars.
Noriega-Crespo, J. A., Cuillandre, Jean-Charles, Rho, Jeonghee, Fajardo-Acosta, Sergio, Sicilia-Aguilar, Aurora, Marston, Anthony, Carey, Sean, Hartmann, L., Lowrance, Patrick, Reach, William T., Allen, L. E., Young, E., Muzerolle, James, Jarrett, Thomas H.   +13 more
core   +2 more sources

NMA Imaging of Envelopes and Disks around Low Mass Protostars and T Tauri Stars [PDF]

Symposium - International Astronomical Union, 1997
We are intensively studying low mass star formation with the radio telescopes at Nobeyama in Japan. Using both the Nobeyama 45 m dish equipped with a 2 × 2 array receiver and the Nobeyama Millimeter Array (NMA), we can cover a very wide spatial range from overall molecular clouds down to compact protoplanetary disks.
Yoshimi Kitamura, Masao Saito, Ryohei Kawabe, Kazuyoshi Sunada   +3 more
openaire   +1 more source

SIMULATIONS ON A MOVING MESH: THE CLUSTERED FORMATION OF POPULATION III PROTOSTARS [PDF]

, 2011
The cosmic dark ages ended a few hundred million years after the big bang, when the first stars began to fill the universe with new light. It has generally been argued that these stars formed in isolation and were extremely massive-perhaps 100 times as ...
Rowan J. Smith, Paul C. Clark, Springel, Volker, Greif, Thomas H., Smith, R., Clark, Paul, Springel, V., Greif, T., Clark, Paul C., Klessen, R., Bromm, Volker, Simon C. O. Glover, Klessen, Ralf S., Ralf S. Klessen, Clark, P., White, Simon D. M., Smith, Rowan J., Glover, Simon C. O., Volker Springel, Thomas H. Greif, Volker Bromm, White, S., Bromm, V., Simon D. M. White, Glover, S.   +24 more
core   +1 more source

Rotational Spectroscopy of the Acetone‐Water Complex: Large Amplitude Motions

ChemPhysChem, Volume 25, Issue 21, November 4, 2024.
The structure and dynamics of the acetone‐water complex were explored using jet‐cooled rotational spectroscopy and computational chemistry calculations. Our detailed rot‐tunneling analyses of acetone‐H2O and −D2O revealed that the interaction with water disrupts the equivalence of the two methyl rotors, resulting in a significantly lower methyl rotor ...
Jiao Gao, Colton D. Carlson, Javix Thomas, Yunjie Xu, Wolfgang Jäger   +4 more
wiley   +1 more source

Formation of Methanol via Fischer‐Tropsch Catalysis by Cosmic Iron Sulphide

ChemPhysChem, Volume 25, Issue 17, September 2, 2024.
Periodic quantum mechanical simulations evidence the potentiality to synthesise methanol through a Fischer‐Tropsch mechanism in different astrophysical environments facilitated by the catalytic properties of cosmic FeS grains, which are enhanced by the presence of naturally‐occurring point surface defects.
Berta Martinez‐Bachs, Alexia Anguera‐Gonzalez, Gerard Pareras, Albert Rimola   +3 more
wiley   +1 more source

Sulforaphane and ophthalmic diseases

Food Science &Nutrition, Volume 12, Issue 8, Page 5296-5311, August 2024.
Sulforaphane (SFN) is an organosulfur compound categorized as an isothiocyanate (ITC), primarily extracted from cruciferous vegetables like broccoli and cabbage. This review comprehensively outlines recent research on SFN, elucidates its mechanisms of action, and discusses potential therapeutic benefits for eye disorders such as age‐related macular ...
Yichi Zhang, Xiaojing Zhao, Yang Liu, Xiuxia Yang   +3 more
wiley   +1 more source