Results 211 to 220 of about 793,175 (240)

IR-Action Spectroscopy of the Astrochemically Relevant HCCS⁺ Cation. [PDF]

ACS Earth Space Chem
Michielan M, Steenbakkers K, Ascenzi D, Diprose JA, Polášek M, Brünken S, Romanzin C, Heazlewood BR, Puzzarini C, Richardson V.   +9 more
europepmc   +1 more source

V3101 Cyg: A Cataclysmic Variable Born with a Brown Dwarf Donor

Ramirez S, Gänsicke B, Sahu S, Belloni D, Pala A, Koester D, Toloza O, Lagos-Vilches F.   +7 more
europepmc   +1 more source

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Interstellar Abundances in External Galaxies

1977
This field has been excellently reviewed recently by Peimbert (1975), Burbidge and Burbidge (1975) and Searle (1975). The present discussion will cover work since these and in particular the evidence for composition gradients across galaxies and the systematics with galactic type.
B. Webster
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Abundances in the interstellar medium

The Astronomy and Astrophysics Review, 1992
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, F. Matteucci
openaire   +2 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
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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
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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
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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.
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