Results 41 to 50 of about 156,409 (216)

Generalized Te([O iii])–Te(He i) Discrepancies in Ionized Nebulae: Possible Evidence of Case B Deviations and Temperature Inhomogeneities

The Astrophysical Journal
The physics of recombination lines in the He i singlet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of He i singlets λ 3614,  λ 3965,  λ 5016,  λ 6678, and  λ 7281 and the triplet He i λ 5876
J. E. Méndez-Delgado, E. D. Skillman, E. Aver, C. Morisset, C. Esteban, J. García-Rojas, K. Kreckel, N. S. J. Rogers, F. F. Rosales-Ortega, K. Z. Arellano-Córdova, S. R. Flury, E. Reyes-Rodríguez, M. Orte-García, S. Tan   +13 more
doaj   +1 more source

Abundances and Depletions of Interstellar Oxygen [PDF]

The Astrophysical Journal, 2005
62 total pages (37 text), 15 figures, 9 ...
Jensen, Adam G., Rachford, Brian L., Snow, Theodore P.   +2 more
openaire   +2 more sources

The formation of molecular hydrogen in the interstellar medium [PDF]

, 2010
H2 is the most abundant molecule in the interstellar medium and forms on the surface of interstellar dust grains. Laboratory studies have been conducted of HD formation on a dust grain analogue, which is a highly-oriented pyrolytic graphite surface ...
Islam, F.
core  

Abundances

, 2016
Species identities and relative abundances of each species on each sampling point of each ...
Oñate, Juan J., Morales, Manuel B., Juan J. Oñate (2907422), Carlos P. Carmona (3249810), Carmona, Carlos P., Irene Guerrero (2907395), Peco, Begoña, Guerrero, Irene, Manuel B. Morales (518439), Begoña Peco (487604)   +9 more
core   +1 more source

Disk evolution, element abundances and cloud properties of young gas giant planets [PDF]

, 2014
ChHc and PBR highlights financial support of the European Community under the FP7 program by an ERC starting grant. PW, IK, and WFT acknowledge funding from the European Union Seventh Framework Programme FP7-2011 under grant agreement No.
Kamp, I., Peter Woitke, Woitke, P., Meijerink, R., Helling, C., Inga Kamp, Christiane Helling, Wing-Fai Thi, Kamp, Inga, Meijerink, Rowin, Woitke, Peter, Kamp, Inga; id_orcid, Rimmer, Paul B., Rowin Meijerink, Rimmer, P.B., Paul B. Rimmer, Thi, W.-F., Thi, Wing-Fai, Helling, Christiane, Paul Rimmer   +19 more
core   +2 more sources

Photochemical effects of Mars‐like UV irradiation on carboxylic acids in carbonaceous chondrites and expectations for abiotic background organics on Mars

Meteoritics &Planetary Science, EarlyView.
Abstract In the search for life on Mars, understanding the origin of preserved organics is critical. Expected sources include exogenous delivery, endogenous synthesis, and potentially life. Environmental processing by ultraviolet (UV) irradiation can alter these organics, obscuring hallmarks of their origin. To deconvolve these effects, we conducted an
D. K. Buckner, J. C. Aponte, A. C. Schuerger, D. I. Foustoukos, F. Seguin, M. B. Wilhelm, G. Cooper, A. J. Williams   +7 more
wiley   +1 more source

The abundance of interstellar lithium

The Astrophysical Journal, 1984
The interstellar Li I 6707-A absorption line is detected toward Rho Oph A at an equivalent width of 3.1 + or - 1.9 (3 sigma)mA. Upper limits near 1 mA also are found toward seven other stars, including 55 Cyg, toward which relatively strong Li I absorption was previously reported.
openaire   +1 more source

On Our Cosmic (In)significance

Ratio, EarlyView.
ABSTRACT This article discusses three interpretations of cosmic significance, all of which reveal something important about the notion of significance. Along the way, it proposes a unified view of significance by combining elements of each of the views.
Oskari Sivula
wiley   +1 more source

A Definitive Determination of the Interstellar Carbon Abundance toward ρ Ophiuchi A and B

The Astrophysical Journal Letters
We present the results of an effort to derive interstellar gas-phase C ii abundances along the lines of sight toward ρ  Oph A and B. Our analysis is based on high-resolution near-ultraviolet and far-ultraviolet archival spectra acquired with the Space ...
Adam M. Ritchey, S. R. Federman, Daniel E. Welty, Adolf N. Witt   +3 more
doaj   +1 more source

Helium and Hydrogen Abundances in the Heliosphere and the Local Interstellar Medium

, 2014
International audienceThe sun is generally thought to have the same helium abundance as that in the solar nebula from which it was formed 4.6 billion years ago. In contrast, the interstellar medium reflects current galactic conditions.
Vincent, Frédéric, Ben-Jaffel, Lotfi
core   +3 more sources