Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..402..507m&link_type=abstract
Astrophysical implications of the laboratory study of presolar materials. AIP Conference Proceedings, Volume 402, pp. 507-521 (
Astronomy and Astrophysics
Astrophysics
1
Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Ultraviolet
Scientific paper
Ultraviolet absorption-line studies of the atomic gas in diffuse interstellar clouds with the Goddard High Resolution Spectrograph onboard the Hubble Space Telescope are providing important new information on the elemental composition of interstellar dust grains. A key development based on observations of interstellar oxygen and krypton is that the overall (gas plus dust) metallicity of the local ISM appears to be about 2/3 of the solar system value. The invocation of this standard along with the measured gas-phase abundance of carbon implies a C dust abundance (per 106 H atoms) of 106 C/H~100. This amount of solid carbon is appreciably lower than that required by current interstellar extinction models. Further constraints on the dust grain composition are being obtained by comparing elemental depletions in different interstellar environments.
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