Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50692f&link_type=abstract
Spitzer Proposal ID #50692
Computer Science
Scientific paper
We propose to obtain Spitzer IRS spectra of 18 background stars toward two cores within the isolated dense filament L673. These stars were carefully selected to probe a wide range of extinctions in the starless core L673-SMM4 and the cluster-forming core L673-SMM1/2 in order to further investigate the silicate-extinction relationship in dense, isolated environments. With the primary goal of characterizing this relationship in different core environments, a previous program (PID 40928) included 63 background stars sampling a wide range of extinctions through four cores: a starless core, single-star-forming core, cluster-forming core, and a core apparently exhibiting an anomalous relationship. The additional observations proposed here would serve to (1) provide a more robust characterization of differences between the silicate-extinction relationship in starless and star-forming cores, and (2) enable us to address whether this relationship is similar for cores of similar star-formation rates. We have shown previously that the silicate-extinction relationship is a sensitive probe of grain evolution, providing constraints on the carbon-to-silicate composition and grain sizes, especially when combined with 1-1000 micron observations.
Allen Lori
Bary Jeff
Boogert Adwin
Fazio Giovanni
Huard Tracy
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