A spectroscopic survey of faint ultraviolet excess stellar objects

Details A spectroscopic survey of faint ultraviolet excess stellar objects A spectroscopic survey of faint ultraviolet excess stellar objects

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..623b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 1, 1985, p. 623-639.

Astronomy and Astrophysics

Astronomy

25

Astronomical Catalogs, Blue Stars, Quasars, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Density Distribution, Subdwarf Stars, White Dwarf Stars

Scientific paper

The results of a complete spectroscopic survey of faint (B = 17.5-19.0) ultraviolet excess (UVX) stellar images in three high galactic latitude fields are reported. A catalogue of the surveyed objects, containing both their slit and objective prism spectra is presented. The catalogue contains 26 QSOs, 20 of which are new identifications. From a comparison with QSO catalogues produced in the same areas of sky using other search techniques, good evidence for the completeness of the survey is found. In the range B = 17.5-19.0 it is found that QSOs typically make up 40 percent of UVX (U-B less than -0.5) selected samples of stellar images. The other objects are metal-poor halo subdwarfs and white dwarfs making up 50 and 10 percent of the sample respectively. In a further complete sample the surface density of UVX (U-B less than -0.35) QSOs between B magnitudes of 17.5 and 19.0 is found to be 3.3 + or - 1.7 per square degree, in good agreement with previously determined values.

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