Poster abstract details
Distance determination of PNe using the extinction-distance method
Abstract
We present individual distances to some PNe determined by the extinction-distance method.
In order to apply this method, and to obtain distances with enough accuracy, we need to determine the spectral type of 40 to 60 stars in the line of sight of each PNe. This imply the necessity of classify few thousands of stellar spectra with S:N ratio between 10 and 60. To solve such need we developed an ANN system to perform automatic spectral classification which could classify spectra with S:N ratio as low as 20 with an accuracy better than 2 spectral subtypes.
In order to apply this method, and to obtain distances with enough accuracy, we need to determine the spectral type of 40 to 60 stars in the line of sight of each PNe. This imply the necessity of classify few thousands of stellar spectra with S:N ratio between 10 and 60. To solve such need we developed an ANN system to perform automatic spectral classification which could classify spectra with S:N ratio as low as 20 with an accuracy better than 2 spectral subtypes.