Results 181 to 190 of about 36,750 (220)

Methanetetrol and the final frontier in ortho acids. [PDF]

Nat Commun
Marks JH, Bai X, Nikolayev AA, Gong Q, McAnally M, Wang J, Pan Y, Fortenberry RC, Mebel AM, Yang T, Kaiser RI.   +10 more
europepmc   +1 more source

Low-temperature gas-phase formation of cyclopentadiene and its role in the formation of aromatics in the interstellar medium. [PDF]

Proc Natl Acad Sci U S A
Yang Z, Medvedkov IA, Goettl SJ, Nikolayev AA, Mebel AM, Li X, Kaiser RI.   +6 more
europepmc   +1 more source

Abiotic sugars in (162173) Ryugu and the primitive CI carbonaceous chondrite Orgueil

Meinert C, Leyva V, Robert M, Pepino R, Bocková J.   +4 more
europepmc   +1 more source

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Abundances in the Interstellar Medium

Annual Review of Astronomy and Astrophysics, 1994
Recent developments in the theory of element production and the chemical evolution of the galaxy are presented. Following this, observational data and their interpretation are given. A case by case analysis of results for D, He, Li and CNO isotope data in the disk and center of our galaxy is presented; previous results for element gradients are also ...
T. L. Wilson, R. T. Rood
exaly   +4 more sources

Interstellar Abundance Standards Revisited

The Astrophysical Journal, 2001
We evaluate the stellar abundances often used to represent the total (gas plus dust) composition of the interstellar medium. Published abundances for B stars, young later type (F and G) stars, and the Sun are compared to the modeled dust-phase and measured gas-phase compositions of the interstellar medium.
Ulysses J. Sofia, David M. Meyer
openaire   +1 more source

Abundance And Chemistry Of Interstellar Hoco+

Astronomy and astrophysics, 1991
Column densities of 10 to the 15th/sq cm toward the Galactic center and not more than 10 to the 12th/sq cm for cold dark clouds are derived from observations using an LVG model, and the chemical implications are discussed. The HOCO(+) 4(04)-3(03) line toward Sgr A is mapped. The fractional abundance of HOCO(+) in the Galactic center region was found to
MINH, YC, BREWER, MK, Irvine, William M., FRIBERG, P, JOHANSSON, LEB   +4 more
openaire   +2 more sources

Interstellar abundances towards SN1987A

AIP Conference Proceedings, 1989
We have derived abundances in three intermediate‐velocity clouds towards SN1987A, using high‐resolution data from the IUE. For the 70 km s−1 cloud, abundances are close to their solar values and a galactic halo origin is proposed for the cloud. The two other features, at 129 and 171 km s−1, have mean abundances of −0.59±0.15 dex and −0.46±0.15 dex ...
J. C. Blades, N. Panagia
openaire   +1 more source

Interstellar carbon abundance [PDF]

Acta Astronomica, 2000
We present 10 new measurements of carbon gas phase column density in the interstellar medium. We have used spectra made with the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope containing the CII 1334.5 Å and CII* 1335.7 Å lines.
openaire   +1 more source

Interstellar silicon abundance [PDF]

Acta Astronomica, 2003
We present 34 measurements of silicon gas phase column densities in the interstellar medium. We have used spectra containing the Si II 1808 Å line which were obtained with the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope (HST).
openaire   +1 more source