SMC Extinction Curve Towards a Quiescent Molecular Cloud

Details SMC Extinction Curve Towards a Quiescent Molecular Cloud SMC Extinction Curve Towards a Quiescent Molecular Cloud

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9718b&link_type=abstract

HST Proposal ID #9718

Computer Science

Hst Proposal Id #9718 Ism And Circumstellar Matter

Scientific paper

The lack of 2175 A bump in the SMC extinction curve is interpreted as an absence of small carbon grains. ISO mid-IR observations support this interpretation by showing that PAH features are absent in the spectra of SMC and LMC massive star forming regions. However, the only ISO observation of an SMC quiescent molecular cloud shows all PAH features, indicating a PAH abundance relative to large dust grains similar to that of Milky Way clouds. We identified a reddened B2III star associated with this cloud. We propose to observe it with STIS to derive the xetinction curve of SMC dust away from HII regions. This observation will provide the first measure of the extinction properties of SMC dust away from star forming regions. It will allow us to disentangle the effects of metallicity and star formation on the SMC extinction curve and dust composition and to assess the relevance of the SMC bump-free extinction curve to low metallicity and/or starburst galaxies in general.

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