HAC contribution to PDR chemistry

Here is the results of calculations obtained with the models SHIVA and MONACO concerning chemical compositions of PDRs the Orion Bar and the Horsehead nebula. Using the SHIVA model one can calculate the evolution of dust grains from hydrogenated amorphous carbon (HAC), while the MONACO model is the chemical gas-grain model based on the network of gas phase and gas-grain chemical reactions. The files "n_CxHy_Av_time_ksi_[XX]_[Object].dat" contain data with abundances of small hydrocarbons at different A_V and for different ages of PDRs. XX means the value of ksi, and an object is either Orion Bar or Horsehead. The columns are following: A_V, time [yr], n_C2H2, n_C2H, n_C3H, n_C3H2, n_C4H, n_C3H+ [cm^-3]. The files "rates_[cXhY]_hac_monaco1.0_[Object].dat" contain data with the rates of production of hydrocarbons CXHY (C2H2 or CH4) due to the HAC destruction and in gas phase chemical reactions at different A_V and for different ages of PDRs. An object is either Orion Bar or Horsehead. The columns are following: A_V, time [yr], the rate of CXHY production due to the HAC destruction when the parameter ksi is 0 obtained with the SHIVA code, the rate of CXHY production due to the HAC destruction when the parameter ksi is 1 obtained with the SHIVA code, rate of CXHY production in gas phase chemical reaction obtained with the MONACO code. The rates are given in units of s^-1 per 1H.