Abstract
view Abstract Citations (24) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hydrogenated Amorphous Carbon Grains and the 2175 Angstrom Interstellar Hump Blanco, Armando ; Bussoletti, Ezio ; Colangelli, Luigi ; Fonti, Sergio ; Stephens, John R. Abstract The first extinction spectra of carbon grains condensed in a hydrogen atmosphere are presented to simulate the formation of dust particles in hydrogen-rich astrophysical environments. In order to assess the influence of hydrogen during grain formation unambiguously, experiments were performed in hydrogen-poor (Ar) and hydrogen-rich (H2) atmospheres allowing the carbon vapor to condense homogeneously into grains. The experimental data confirm the theoretical predictions on the lack of any feature in the UV spectra of fully hydrogenated amorphous carbon grains and clearly show the relevance of the different atmospheres during the condensation process. The results support the idea that grains observed in the interstellar medium, which show a strong 2175-A feature, have undergone some processing subsequent to their formation. Publication: The Astrophysical Journal Pub Date: December 1991 DOI: 10.1086/186221 Bibcode: 1991ApJ...382L..97B Keywords: Amorphous Materials; Interstellar Chemistry; Interstellar Extinction; Interstellar Matter; Ultraviolet Spectra; Carbon; Hydrogen; Optical Properties; Astrophysics; INTERSTELLAR: GRAINS; LABORATORY SPECTRA; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (6)
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