Classification algorithms applied to 10 588 low-resolution slitless spectra - A search for unusual and interesting objects

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view Abstract Citations (4) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Classification Algorithms Applied to 10588 Low-Resolution Slitless Spectra: A Search for Unusual and Interesting Objects Beauchemin, M. ; Borra, E. F. Abstract We have performed a search for unusual objects among nearly 11000 low- resolution spectra taken from 23 grens plates of the CFHT-Laval survey (14.5 deg^2^;14 < V < 18). The classification method used is based on a hierarchical clustering analysis technique. In a first step, we exploit the highly effective and objective power of the method at isolating uncommon energy distributions. The clustering analysis also provides us with a tool to determine synoptic groups for common stars in the sample. This permits us to identify peculiar objects using a template matching technique. We furnish positions, magnitudes, grens energy distributions and finding charts for 4 objects having energy distribution significantly different from the rest of the population. We identify 32 other objects of interest, among them: 14 strong emission line objects, 8 suspected degenerate stars and 3 very blue spectra without a Balmer discontinuity. Publication: The Astronomical Journal Pub Date: April 1993 DOI: 10.1086/116539 Bibcode: 1993AJ....105.1587B Keywords: Algorithms; Peculiar Stars; Spectral Energy Distribution; Spectrum Analysis; Stellar Magnitude; Stellar Spectra; Cluster Analysis; Position (Location); Sky Surveys (Astronomy); Astronomy; SURVEYS; METHODS: ANALYTICAL full text sources ADS | data products SIMBAD (37) NED (25)