I review the basic processes that may be used to develop a chemical evolutionary sequence for low-mass starless cores. I highlight observational results from the Arizona Radio Observatory-Green Bank Survey. Observations were performed with the SMT 10-m, ARO 12-m, and GBT 100-m toward a sample of 25 nearby (D < 400 pc) low-mass starless cores which have radiative transfer models of the 850 μm emission and observed SED (160 - 1300 um). The cores were observed in the lines of NH3 (1,1) and (2,2), o-NH2D 1_{11} - 1_{01}, C2S 1_2 - 2_1, C3S 4 - 3, HCN 1 - 0, HC5N 9 - 8, HC7N 21 - 20, C18O and C17O 2 - 1, and p-H2CO 1_{01} - 0_{00}.
@article{arxiv.0709.2927,
title = {Developing A Chemical Evolutionary Sequence for Low-mass Starless Cores},
author = {Yancy L. Shirley},
journal= {arXiv preprint arXiv:0709.2927},
year = {2007}
}
Comments
To appear in "Molecules in Space & Laboratory", Paris 2007, eds. J.L. Lemaire & F. Combes. Corrected typo, otherwise "more or less" the same