Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1294g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 693, p. 1294-1307
Astronomy and Astrophysics
Astronomy
7
Astronomical Catalogs, Cosmic X Rays, Quasars, Sky Surveys (Astronomy), Charge Coupled Devices, Color-Color Diagram, Color-Magnitude Diagram, Data Reduction, Spectrophotometers, Stellar Color
Scientific paper
Twenty-five QSO candidates with B less than or equal to 22.0 have been selected from a 0.33 sq deg BVRI CCD survey of the North Ecliptic Pole. Those stellarlike objects which departed significantly from the locus defined by stars in a multicolor space were identified as candidates. We looked unsuccessfully for objects which might have been anomalously fainter than the limiting magnitude in one or more bands. Two of the candidates near the red end of the stellar locus may be M or K dwarf stars, and two candidates with V-I greater than 1.0 may be unresolved galaxies. The completeness of the survey, estimated from the fraction of QSOs with colors indistinguishable from stars, is about 50% to B = 21.60. Contamination by main-sequence stars, white-dwarf stars, blue-subdwarf stars, and galaxies is about 20%.
Gaidos Eric J.
Magnier Eugene Allen
Schechter Paul L.
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