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Ultraviolet stellar spectral classification using a multilevel tree neural network
Gupta, R.; Gulati, R. K.; Gothoskar, P. +1 more
Here we present a pattern classification technique based on an Artificial Neural Network (ANN) in a multi-level tree configuration to classify ultraviolet stellar spectra from the IUE Low-Dispersion Spectra Reference Atlas. Preliminary results of this technique show that 94% of the spectra have been classified correctly with an accuracy of one sub…
How tracer objects can improve competitive learning algorithms in astronomy
Murtagh, F.; Hernandez-Pajares, M.; Floris, J.
The main objective of this paper is to discuss how the use of tracer objects in competitive learning can improve results in stellar classification. To do this, we work with a Kohonen network applied to a reduced sample of the Hipparcos Input Catalogue, which contains missing values. The use of synthetic stars as tracer objects allows us to determi…