Far-UV Extinction and the Size Distribution of Interstellar Grains

Details Far-UV Extinction and the Size Distribution of Interstellar Grains Far-UV Extinction and the Size Distribution of Interstellar Grains

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1911w&link_type=abstract

IUE Proposal ID #IEGAW

Physics

Scientific paper

We are proposing to determine the UV extinction curves for early-type stars embedded in dense interstellar clouds, which appear as bright reflection nebulae as a result of their association with the respective stars. The purpose of this program is to derive information concerning the size distributions of grains prevailing in these individual clouds. The data obtained from this program will be related to results derived from a parallel groundbased observing program directed at measuring the relative intensity of extended red/near-IR emission (ERE) emission (Sellgren, Werner, and Dinerstein 1983) in the same nebulae. The recently discovered ERE has been interpreted as being due to thermal radiation produced in temperature fluctuations of micrograins (10^-7 cm size), a hypothesized grain population intermediate in size between interstellar molecules and ordinary grains. It is our aim to determine whether relationships exist between the relative intensity of ERE and the steepness of the far-UV extinction rise in these nebulae, which would strengthen the interpretation of both phenomena in terms of a wide, continuous size distribution of very small grains in the 10^-610^-7 cm range. An additional benefit of our study would be new information on the range of variation of extinction curves attributable to individual clouds.

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