Results 111 to 120 of about 793,175 (240)

The abundant elements in interstellar dust

The Astrophysical Journal, 1994
We explore the incorporation of the cosmically abundant species O, C, N, Mg, Si, Fe, and S into interstellar dust. Column densities based on Goddard High Resolution Spectrograph 3.5 km/s resolution measurements from the literature for eight individual absorbing regions toward five lines of sight are used.
Ulysses J. Sofia, Jason A. Cardelli, Blair D. Savage   +2 more
openaire   +1 more source

Abundances of Chemical Elements in Open Star Clusters as Indicators of their Nature

Open Astronomy, 2015
Applying a compilled catalog, we find that the relative abundances of α-elements in open clusters and in field stars of the thin disk of the Galaxy show different dependencies on metallicity, age and parameters of their Galactic orbits.
Marsakov V. A., Gozha M. L., Koval’ V. V., Shpigel’ L. V.   +3 more
doaj   +1 more source

The Chemical Composition of Cernis 52 (BD+31 640)

, 2009
We present an abundance analysis of the star Cernis 52 in whose spectrum we recently reported the napthalene cation in absorption at 6707.4 {\AA}. This star is on a line of sight to the Perseus molecular complex.
A. Manchado, Al-Naimiy, Baschek, Bessell, Cernis, D. A. García-Hernández, D. L. Lambert, Dahm, Draine, Evans, González Hernández, González Hernández, González Hernández, González Hernández, Grevesse, Herbig, Iglesias-Groth, Iglesias-Groth, J. I. González Hernández, Kurucz, Kurucz, Kurucz, Luhman, McCall, Nordhagen, Piskunov, R. Rebolo, Rosolowsky, S. Iglesias-Groth, Sbordone, Siess, Sneden, Takeda, Trullols, Watson, Watson   +35 more
core   +2 more sources

Chemistry of NH2CH2CH2OH and Its Related Species in the Interstellar Medium

The Astrophysical Journal Supplement Series
Ethanolamine (NH _2 CH _2 CH _2 OH) can form not only glycine directly under the conditions of proposed Archean alkaline hydrothermal vents, a possible environment for the origin of life, but also the polar hydrophilic head of phosphatidylethanolamine ...
Guoming Zhao, Mingwei He, Donghui Quan, Xue Yang, Long-Fei Chen, Dalei Li, Qiang Chang, Yuxuan Wu, Yanze Teng, Yisheng Qiu, Xinke He, Ming-Shuo Ma, Minglei Qu   +12 more
doaj   +1 more source

Analysis of ultraviolet spectrophotometric data from Copernicus [PDF]

Ultraviolet spectral data from the OAO 3 satellite are being used to study interstellar absorption lines and stellar and circumstellar lines in hot stars.
Snow, T. P., Jr.
core   +1 more source

Gas-grain models for interstellar anion chemistry

, 2012
Long-chain hydrocarbon anions CnH- (n=4, 6, 8) have recently been found to be abundant in a variety of interstellar clouds. In order to explain their large abundances in the denser (prestellar/protostellar) environments, new chemical models are ...
Brown, Brown, Brünken, Caselli, Cernicharo, Charnley, Cordiner, Cordiner, Cordiner, Crapsi, Eichelberger, Gupta, Harada, Hasegawa, Hassel, Herbst, Lee, Lee, Leger, M. A. Cordiner, McCarthy, Millar, Peeters, Remijan, Roberts, S. B. Charnley, Sakai, Sakai, Sakai, Thaddeus, Umebayashi, Wakelam, Walsh, Öberg   +33 more
core   +1 more source

Effect of Supernovae on the Local Interstellar Material

, 2017
A range of astronomical data indicates that ancient supernovae created the galactic environment of the Sun and sculpted the physical properties of the interstellar medium near the heliosphere.
Dwarkadas, Vikram V., Frisch, Priscilla
core   +1 more source

Photochemistry in the inner layers of clumpy circumstellar envelopes: formation of water in C-rich objects and of C-bearing molecules in O-rich objects

, 2010
A mechanism based on the penetration of interstellar ultraviolet photons into the inner layers of clumpy circumstellar envelopes around AGB stars is proposed to explain the non-equilibrium chemistry observed in such objects.
Agúndez, Agúndez, Bieging, Bujarrabal, Cernicharo, Chapman, Charnley, Chase, Dinh-V-Trung, Duari, Duari, Fonfría, Fong, Guélin, Guélin, Hasegawa, Milam, Tejero, Tenenbaum, Tsuji, Tsuji, Weigelt, Willacy, Willacy   +23 more
core   +2 more sources

Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

The Astrophysical Journal Letters
We interpret the peculiar supersolar nitrogen abundance recently reported by the James Webb Space Telescope observations for GN-z11 ( z = 10.6) using our state-of-the-art chemical evolution models.
Chiaki Kobayashi, Andrea Ferrara
doaj   +1 more source

The 4He1H ratios in the chemical compositions of solar flare particles and the primordial solar nebula [PDF]

The chemical abundances of solar flare particles are similar to those of galactic cosmic rays at their sources. In order to infer the 4He/1H ratio in the solar atmosphere, this ratio as observed in the interstellar gases was considered in addition to ...
Sakurai, K.
core   +1 more source