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Variability Analysis based on POSS1/POSS2 Photometry

Published online by Cambridge University Press:  20 April 2012

Areg M. Mickaelian
Affiliation:
Byurakan Astrophysical Observatory (BAO), Byurakan 0213, Aragatzotn Province, Armenia email: aregmick@aras.am, spk7711@gmail.com
Alain Sarkissian
Affiliation:
Laboratoire Atmosphères, Milieux et Observations Spatiales, 78280 Guyancourt, France email: alain.sarkissian@latmos.ipsl.fr
Parandzem K. Sinamyan
Affiliation:
Byurakan Astrophysical Observatory (BAO), Byurakan 0213, Aragatzotn Province, Armenia email: aregmick@aras.am, spk7711@gmail.com
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Abstract

We introduce accurate magnitudes as combined calculations from catalogues based on accurate measurements of POSS1- and POSS2-epoch plates. The photometric accuracy of various catalogues was established, and statistical weights for each of them have been calculated. To achieve the best possible magnitudes, we used weighted averaging of data from APM, MAPS, USNO-A2.0, USNO-B1.0 (for POSS1-epoch), and USNO-B1.0 and GSC 2.3.2 (for POSS2-epoch) catalogues. The r.m.s. accuracy of magnitudes achieved for POSS1 is 0.184 in B and 0.173 mag in R, or 0.138 in B and 0.128 in R for POSS2. By adopting those new magnitudes we examined the First Byurakan Survey (FBS) of blue stellar objects for variability, and uncovered 336 probable and possible variables among 1103 objects with POSS2–POSS1 ≥ 3σ of the errors, including 161 highly probable variables. We have developed methods to control and exclude accidental errors for any survey. We compared and combined our results with those given in Northern Sky Variability Survey (NSVS) database, and obtained firm candidates for variability. By such an approach it will be possible to conduct investigations of variability for large numbers of objects.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

References

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