Study of Long-Term Variability of ON 231

Details Study of Long-Term Variability of ON 231 Study of Long-Term Variability of ON 231

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..43e&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 43-43"

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Scientific paper

ON 231 (W Com, m=16.5, z=0.102) has been studied by a number of authors for its short and long term variability (e.g. Erastova 2004, AATr 23, 209). However, more observations are needed for understanding and explanation of its possible multiple variations, including the quasi-periodic and non-periodic ones reaching up to 0.3 magnitudes. During 1969-1976, one of the authors (LKE) had carried out observations in the Coma field with R.A.=12h26m, DEC=+25d55m for study of the variations of the flare stars. 187 plates with “chain” images (by a slight shifting of the plate for multiple images) were obtained using the Byurakan 0.5m and 1m Schmidt telescopes giving 5x5 deg and 4x4 deg fields, respectively. It appeared that ON 231 was present in 141 of these plates with some 1200 total exposures, and an idea was put forward to scan and measure these images for further variability studies. All available plates were scanned: out of 141 plates with ON 231, useful measurements were done in about 80 ones (in others, the object was too faint or the images were not good). A script was written under MIDAS for reduction of the plates and measurements. The study of the variability was done by a comparison with the neighbouring standard stars, and the equivalent widths (EW) of the measured images (each point in the chains) were the main criteria for the comparison. There are also two other AGN in the field: FBQS J122424.3+243623 (z=0.218, a 87GB and ROSAT source) and FBQS J123014.1+251804 (z=0.135, a ROSAT source). These objects will be studied later for a possible variability as well, as they are also blazar candidates.

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