Results 71 to 80 of about 4,978 (213)

Interacting jets from binary protostars [PDF]

Astronomy & Astrophysics, 2007
We investigate potential models that could explain why multiple proto-stellar systems predominantly show single jets. During their formation, stars most frequently produce energetic outflows and jets. However, binary jets have only been observed in a very small number of systems. We model numerically 3D binary jets for various outflow parameters.
Murphy, G. C., Lery, T., O'Sullivan, S., Spicer, D., Bacciotti, F., Rosen, A.   +5 more
openaire   +4 more sources

Limitations of the modified blackbody fit method for determining molecular cloud properties

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley   +1 more source

Magnetic field measurements in a sample of Class I and flat-spectrum protostars observed with SPIRou

Astronomy & Astrophysics
Context. Magnetic fields play a crucial role throughout stellar evolution in regulating angular momentum, channelling accretion, and launching jets and outflows.
Drouglazet L., Alecian E., Sousa A., Cristofari P. I., Artigau E., Bouvier J., Carmona A., Cook N. J., Dougados C., Duchêne G., Folsom C. P., Nowacki H., Perraut K., Alencar S. H. P., Amard L., Audard M., Cabrit S., Donati J.-F., Grankin K., Grosso N., Kochukhov O., Kóspál Á., Le Gouellec V. J. M., Manchon L., Pantolmos G., Petit P., Petitdemange L., Devaraj R., Shang H., Takami M.   +29 more
doaj   +1 more source

Dissecting high-mass protostars with SPARKS

, 2019
The origin of the highest mass stars is still an enigma in modern astrophysics. The SPARKS project (Search for high-mass protostars with ALMA up to 5 kpc) is a high angular resolution follow-up of the complete sample of infrared quiet massive clumps ...
Csengeri, Timea, Csengeri, Timea (8170410)   +1 more
core   +1 more source

Jets in Low-Mass Protostars

Universe
Jets and outflows are key components of low-mass star formation, regulating accretion and shaping the surrounding molecular clouds. These flows, traced by molecular species at (sub)millimeter wavelengths (e.g., CO, SiO, SO, H2CO, and CH3OH) and by atomic,
Somnath Dutta
doaj   +1 more source

Formation of Massive and Wide First-star Binaries in Radiation Hydrodynamic Simulations

The Astrophysical Journal, 2023
We study the formation of Population III stars by performing radiation hydrodynamic simulations for three different initial clouds extracted from cosmological hydrodynamic simulations.
Kazuyuki Sugimura, Tomoaki Matsumoto, Takashi Hosokawa, Shingo Hirano, Kazuyuki Omukai   +4 more
doaj   +1 more source

Molecules in Dense Clouds and Protostars [PDF]

Highlights of Astronomy, 1971
AbstractThis paper deals with the interpretation of molecular line emission from class I OH/H2O emission centers associated with compact HII regions and with the OH 18 cm emission from dark clouds in T-Tauri star associations. Observational evidence is presented, that class IOH/H2O emission centers represent a particular stage in the evolution of a ...
openaire   +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   +5 more sources

Pristine composition or size evolution: Can current dust models reproduce emissivities observed in nearby protostars?

Astronomy & Astrophysics
Context. Interstellar medium dust is a crucial asset in many astronomical observations, as its emission permits the retrieval of the physical properties of astrophysical structures.
Carpine M.-A., Maury A., Ysard N., Cacciapuoti L.   +3 more
doaj   +1 more source

Observational characteristics of dense cores with deeply embedded young protostars

, 2005
Class 0 objects, which are thought to be the youngest protostars, are identified in terms of NIR or radio emission and/or the presence of molecular outflows.
S. P. Goodwin, Stamatellos, Dimitrios, D. Stamatellos, A. P. Whitworth, Whitworth, Anthony Peter, Goodwin, Simon Paul   +5 more
core   +1 more source