On the nature of objects detected as faint long-term variables

Details On the nature of objects detected as faint long-term variables On the nature of objects detected as faint long-term variables

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..417h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 15, 1986, p. 417-426.

Astronomy and Astrophysics

Astronomy

37

Quasars, Variability, Astronomical Photometry, Light Curve, Subdwarf Stars, Ultraviolet Radiation, White Dwarf Stars

Scientific paper

Two complete samples of objects in the range 17 < B < 18.5 are selected on the basis of optical variability and ultraviolet excess. Multicolour photometry, objective prism and slit spectra are used to ascertain the composition of the two samples. The sample of variables is found to be composed almost entirely of quasars. The sample of UVX objects appears to contain about 50 per cent white dwarfs or blue subdwarfs, and 50 per cent quasars. About 30 per cent of the quasars are included in the sample of variables and most of the remainder show significant variability.

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