Chemical Evolution of Dust Grains in Prestellar Cores

Details Chemical Evolution of Dust Grains in Prestellar Cores Chemical Evolution of Dust Grains in Prestellar Cores

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3290l&link_type=abstract

Spitzer Proposal ID #3290

Computer Science

Scientific paper

The primary goal of this proposal is to trace the ice and gas evolution in evolving prestellar cores and thereby understand their dust and chemical evolution. In these cold (10K) cores we see evidence for severe depletion of gas molecules in the highest density regions, in agreement with models that predict a steady accumulation of grain mantles in dense cores. We propose to obtain absorption spectral data of molecular ices in a few prestellar and protostellar cores using 2MASS stars as background targets. We will compare the ice column densities along representative lines of sight for which we have dust column density measurements through the cores from the extinction data. For one source, B68, there are a sufficient number of background stars to determine the radial distribution of ice material. We will use these Spitzer Space Telescope observations to validate and refine our protostellar chemical models, which in turn will enable us to understand more about the pathways to the gas, gas-grain processes that lead to the formation of simple molecules and complex biogenic species in the interstellar medium. We seek twenty hours of Spitzer IRS time to collect spectral data in six representative prestellar cores, at varying evolutionary status, which are currently subjected to intense observing at all wavelengths and theoretical modeling.

Affiliated with

Also associated with

No associations

Rating

Chemical Evolution of Dust Grains in Prestellar Cores does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chemical Evolution of Dust Grains in Prestellar Cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical Evolution of Dust Grains in Prestellar Cores will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1823835