Cyanopolyynes as indicators of late-time chemistry and depletion in star-forming regions

Details Cyanopolyynes as indicators of late-time chemistry and depletion in star-forming regions Cyanopolyynes as indicators of late-time chemistry and depletion in star-forming regions

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291..235r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 291, Issue 1, pp. 235-240.

Astronomy and Astrophysics

Astronomy

46

Stars: Formation, Ism: Molecules

Scientific paper

Quantitative results for the time-dependent behaviour of the fractional abundance of HC_3N in dense cores are given. In addition to the standard `early-time' HC_3N maximum found for many situations in which elements other than hydrogen are initially in atomic form, a secondary maximum occurs for a variety of conditions after depletion has become significant. The secondary maximum can be sufficiently large and occur for a sufficiently wide range of physical conditions that the assertion that the presence of high fractional abundances of cyanopolyynes implies chemical and dynamical youth for the cyanopolyyne emission peak in TMC-1 and other star-forming regions may not be secure.

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