Far-Uv Extinction for Deeply Embedded Stars in Interstellar Clouds

Details Far-Uv Extinction for Deeply Embedded Stars in Interstellar Clouds Far-Uv Extinction for Deeply Embedded Stars in Interstellar Clouds

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5890s&link_type=abstract

HST Proposal ID #5890

Physics

Hst Proposal Id #5890 Interstellar Medium

Scientific paper

Optical and UV absorption observations of interstellar clouds are inherently limited to studies of only the outer edges of the clouds because of grain extinction. A deeper penetration of the clouds is important to the overall understanding of these objects because the grain properties are expected to change with depth in the clouds by either the coagulation of grains or the accretion of fresh material from the gas phase (ices and/or refractory material). The far-UV grain properties in particular will affect the penetration of UV photons into the cloud cores, with a consequent effect on the cloud chemistry and physical state. In order to elucidate the changes in grain properties and UV fields in dark clouds, an extinction study of targets deep in interstellar clouds is proposed for the FOS instrument of the HST. This instrument can penetrate deeper into the cloud than has been done before.

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