Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-11-05
Astronomy and Astrophysics
Astrophysics
16 pages plus 6 figures available in hardcopy from ggcpalumbo@alma02.cineca.it LaTEX ver. 2.09, BAP 11-1993-036-DDA
Scientific paper
10.1086/174137
This paper is intended as part of a more extensive molecular line survey in star forming regions along the evolutionary track of a collapsing cloud toward a young stellar object. We have studied a sample of seven small dark clouds (Bok globules) and eight Herbig Ae/Be stars in the J=1->0 transition of HCO$^{+}$, H$^{13}$CO$^{+}$, HCN and H$^{13}$CN. The choice of these molecules is determined by the simple chemistry and the predicted high abundance of the reactants leading to their formation. The isotopically substituted species (isotopomers), H$^{13}$CO$^{+}$ and H$^{13}$CN, were observed in order to determine, whenever possible, the optical thickness of the main species. The most abundant isotopomers were found in almost all the sources (detection rate 70-90\%). Those sources which exhibited the strongest signals were also searched for the $^{13}$C isotopomers. H$^{13}$CO$^{+}$ was found in one dark cloud and around three Herbig Ae/Be stars, while H$^{13}$CN around only one star. The column densities for each species and the physical conditions of the objects were derived whenever the observational data allowed it.
Bergman Per
Bruni Gabriele
Palumbo Giorgio G. C.
Scappini Flavio
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