A survey for faint variable objects in SA 57

Details A survey for faint variable objects in SA 57 A survey for faint variable objects in SA 57

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..108t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, July 1989, p. 108-116. Research supported by CNR.

Astronomy and Astrophysics

Astronomy

57

Faint Objects, Milky Way Galaxy, Quasars, Red Shift, Sky Surveys (Astronomy), Astronomical Catalogs, Variability

Scientific paper

Nine Mayall 4 m prime-focus Kodak IIIa-J plates spanning an 11-yr baseline are analyzed in a uniform manner for the detection of variable objects to B = 22.6 at the level of Sigma of about 0.1 mag. Techniques are developed that succeed in independently finding objects already known to be variable, namely a sample of QSOs. Few additional objects were identified as variables with high certainty. The principal result, therefore, is an upper limit both to variable QSOs not previously identified by other techniques, and an upper limit at faint magnitudes on other classes of variable objects.

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