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Ethynyl Around the HII Regions S255 and S257

Kirsanova, M. S.; Punanova, A. F.; Buslaeva, A. I.

We present the results of the ethynyl (C₂H) emission line observations towards the S255 and S257 HII regions and the molecular cloud between them. Radial profiles of line brightness, column density, and abundance of C₂H are obtained. We show that the radial profile of the ethynyl abundance is almost flat towards the HII regio…

Principal Component Analysis for Estimating Parameters of the L1287 Dense Core by Fitting Model Spectral Maps into Observed Ones

Pirogov, L. E.; Zemlyanukha, P. M.

An algorithm has been developed for finding the global minimum of a multidimensional error function by fitting model spectral maps into observed ones. Principal component analysis is applied to reduce the dimensionality of the model and the coupling degree between the parameters, and to determine the region of the minimum. The k-nearest neighbors …