Results 61 to 70 of about 12,515 (261)

Isolating Dust and Free–Free Emission in ONC Proplyds with ALMA Band 3 Observations

The Astrophysical Journal, 2023
The Orion Nebula Cluster (ONC) hosts protoplanetary disks experiencing external photoevaporation by the cluster’s intense UV field. These “proplyds” are comprised of a disk surrounded by an ionization front.
Nicholas P. Ballering, L. Ilsedore Cleeves, Thomas J. Haworth, John Bally, Josh A. Eisner, Adam Ginsburg, Ryan D. Boyden, Min Fang, Jinyoung Serena Kim   +8 more
doaj   +1 more source

Chemical abundances in the protoplanetary disk LV2 (Orion): clues to the causes of the abundance anomaly in HII regions [PDF]

, 2010
Optical integral field spectroscopy of the archetype protoplanetary disk LV2 in the Orion Nebula is presented, taken with the VLT FLAMES/Argus fibre array.
Asplund, Bally, Benjamin, Blagrave, Blagrave, Cardelli, D. Péquignot, Davey, Doi, Drake, Ercolano, Esteban, Esteban, García-Rojas, Gonzalez, Gonzalez, Henney, J. M. Vílchez, J. R. Walsh, Johnstone, Jones, Keenan, Keyes, Kingsburgh, Lanz, Laques, Laws, Liu, Maggio, McCaughrean, Meaburn, Mesa-Delgado, Mesa-Delgado, Mesa-Delgado, Neves, Osterbrock, O’Dell, O’Dell, O’Dell, O’Dell, O’Dell, O’Dell, Pasquini, Peimbert, Peimbert, Peimbert, Peimbert, Reid, Rodríguez, Rubin, Rubin, Rubin, Rubin, Santos, Schertl, Simón-Díaz, Smith, Smits, Stasińska, Storey, Storey, Tsamis, Tsamis, Tsamis, Tsamis, Tsamis, Tsamis, Vasconcelos, Viegas, Walsh, Walsh, Y. G. Tsamis, Zeippen   +72 more
core   +4 more sources

An Analytical Method for Quantification of Sn Isotope Variations in Geological Materials Using MC‐ICP‐MS

Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 863-885, December 2024.
Key Points A method is described to obtain high precision Sn isotope ratios using the double spike technique in geological reference materials containing 0.03 to 7 μg g−1 of Sn. δ122/118Sn values are reported for sixteen geological RMs. Improved precision was achieved compared with previous studies by using low concentration Sn analyte.
Dipankar Pathak, Klaus Mezger
wiley   +1 more source

Large-scale Wind-driven Structures in the Orion Nebula

The Astronomical Journal
A study of [C ii ] 158 μ m and H i 21 cm spectroscopic images plus high-velocity-resolution optical and ultraviolet spectra has shown the structure of the Orion Nebula to be different from that found from the study of those data separately.
C. R. O’Dell, N. P. Abel
doaj   +1 more source

Effect of Nonuniform Parallel Magnetic Field on the Kelvin–Helmholtz Instability in the Orion Nebula

The Astrophysical Journal
The surface rippled structures of Orion molecular cloud have been attributed to the Kelvin–Helmholtz (KH) instability, and the influence of magnetic field and pressure on the formation and evolution of these structures is one of the important issues that
Hang Peng, Fang Yu, Lai Wei, Zheng-Xiong Wang, Yue Liu   +4 more
doaj   +1 more source

A Review of the Migration of Hydrogen From the Planetary to Basin Scale

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 6, June 2024.
Abstract The occurrence of natural hydrogen and its sources have been reviewed extensively in the literature over the last few years, with current research across both academia and industry focused on assessing the feasibility of utilizing natural hydrogen as an energy resource.
Bhavik Harish Lodhia, Luk Peeters, Emanuelle Frery   +2 more
wiley   +1 more source

The catastrophic break‐up of the ureilite parent body: Modeling constraints on the debris size

Meteoritics &Planetary Science, Volume 59, Issue 6, Page 1407-1420, June 2024.
Abstract The ureilite parent body (UPB) was, in all likelihood, completely broken apart when hit by another object early in its history and reassembled into daughter bodies. We here present a study tailored to constrain the dimensions of the impact debris produced in the catastrophic disruption.
Andrea Patzer, Julia Kowalski, Tommaso Di Rocco, Andreas Pack   +3 more
wiley   +1 more source

Spectrophotometry of the Orion Nebula [PDF]

Publications of the Astronomical Society of the Pacific, 1973
Observations of line and continuum strengths were made in six regions in the Orion nebula. From the observations, electron temperatures, electron densities, and chemical abundances are derived. A model for the Orion nebula is computed that agrees with the optical and radio observations of the nebula.
openaire   +1 more source

HST Spectroscopy of the Orion Nebula [PDF]

Symposium - International Astronomical Union, 1996
From our recent Faint Object Spectrograph (FOS) observations of the Orion Nebula obtained with the Hubble Space Telescope, we present preliminary results that address the nitrogen abundance. The list of detected lines and their identifications included the first measurement of the N II] 2142 Å line in an H II region.
R. H. Rubin, G. J. Ferland, R. J. Dufour, D. K. Walter, C. R. O’Dell, J. A. Baldwin, J. J. Hester, P. G. Martin   +7 more
openaire   +1 more source

The area around the Orion Nebula observed in the CO (J = 1- 0) transition [PDF]

, 1980
An area 1 deg2 around the Orion Nebula has been surveyed with a 2.6 km s-1 wide single-channel receiver. The map shows considerable structure in the east including a bright spot 24' (2.8 pc) from the main CO ...
Gillespie, A. R., White, G. J.
core