44 Result(s)
within
L. Colangeli
English
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Chapter and Conference Paper
Physical Properties of Submicronic Carbonaceous Particles Candidate as Cosmic Dust
We present here a compendium of our laboratory measurements of the physical properties of submicronic particles made by some carbonaceous materials candidate as cosmic dust: amorphous carbon, silicon carbide. ...
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Article
Laboratory measurements of physical properties on submicronic particles candidate as cosmic dust
We present here a compendium of our laboratory measurements of the physical properties of submicronic particles of materials candidate as cosmic dust: amorphous carbon, silicon carbide and graphite. Comparison...
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Chapter
Vuv to Fir Laboratory Observations on Submicron Amorphous Carbon Particles
We present here a general overview of our experimental results obtained on submicron amorphous carbon particles. Morphological and spectroscopic analysis represent a useful tool to test the particles produced ...
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Article
Amorphous carbon around carbon stars
In this paper we present the results of a simplified model to determine the flux emerging from dust envelopes around cool stars. The model proposed holds under the hypotheses of negligible scattering effects a...
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Chapter and Conference Paper
Experimental Evidences for HAC and PAHs Soup in Space
Since its discovery in the spectrum of NGC 7027, the family of weak IR bands, the so called unidentified IR bands (hereinafter UIR), has been found in emission in a wide variety of galactic and extragalactic s...
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Chapter and Conference Paper
Amorphous Carbon and Silicon Carbide Grains Around Carbon Stars
It is well known that a large amount of dust (~ 40%) is produced in the envelopes of late-type stars (Jura, 1985). Moreover, according to Knapp and Morris (1985) a very important contribution to this amount (a...
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Chapter and Conference Paper
Silicate Grains in Space: Laboratory Results
Since their discovery in the spectra of some strong IR sources (Stein et al., 1969; Woolf and Ney, 1969; Forrest et al., 1979), the bands at around 10 µm and 20 µm have been respectively attributed to typical Si-...
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Chapter and Conference Paper
Solid Carbon in Space
Interstellar grains represent an important constituent of matter in space. They are necessary to the cooling and heating mechanisms and play an important role in the gas phase composition of molecular clouds. ...
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Chapter and Conference Paper
Optical Properties of Carbonaceous Materials
We discuss the optical properties of carbonaceous materials from the VUV to the FIR. Updated laboratory data on amorphous carbon (HAC) and some PAH mixtures are analysed and compared with relevant literature. ...
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Article
Amorphous carbon and carbonaceous materials in space
We present here a fitting of the spectrum of the carbon star GL799, obtained using a mixture of amorphous carbon (AC) and silicon carbide (SiC) grains. We have also interpreted the 3.4 μm band of Comet Halley,...
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Chapter and Conference Paper
Carbonaceous Solid Materials: From Laboratory to Space
We present here an updated review of laboratory results obtained from different carbonaceous materials in grain and molecular forms. Temperature behaviour of bands falling between 3 µm and 13 µm is reported for s...
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Article
Comet composition: Models and new observations
We discuss structure and composition of comets as they are inferred on the basis of new theoretical models and very recent observations. Many questions are still open, but the efforts performed in coincidence ...
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Article
Amorphous carbon and carbonaceous materials in space
We present here the most recent measurements (UV and Raman spectroscopy) carried out on carbonaceous materials candidates as cosmic dust.
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Article
Cosmic dust: From space to laboratory
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Chapter and Conference Paper
Laboratory Spectra of Amorphous and Crystalline Olivine: An Application to Comet Halley IR Spectrum
Among the various silicates proposed as components of cosmic dust grains, olivine is considered one of the most likely materials. In this work we present the infrared spectra of three different types of olivin...
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Chapter and Conference Paper
Simulation in Laboratory of Solid Grains Present in Space
Laboratory data on cosmic dust analogue materials are compared with recent results obtained by means of spectroscopy and mass spectrometry on cometary dust, meteorites and interplanetary dust. Their actual che...
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Article
Laboratory measurements on molecules of astrophysical interest
The infra-red absorption bands of a representative polycyclic aromatic hydrocarbon (PAH) molecule, coronene, have been examined in the laboratory at various temperatures up to 240 °C. This paper is devoted to ...
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Article
Condensation of cosmic analog material in microgravity conditions: Preliminary analysis of a first set of flights
In this paper we give a brief summary of the first results obtained in the frame of the STARDUST project. The aim of the experiment is to simulate the condensation of cosmic-dust analog materials under microgr...
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Article
Thermoluminescence of Cosmic matter
A simplified model of thermoluminescence in silicates is presented and the astronomical applications of the phenomenon are shown. Finally our experimental apparatus and preliminary tests are presented and comp...
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Article
Dust particle impacts during the Giotto encounter with comet Grigg–Skjellerup
IN the European Space Agency's 1992 Giotto Extended Mission, the Dust Impact Detection System operated successfully during a fly-by that took the spacecraft within about 200 km of the nucleus of comet Grigg–Sk...
