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J/MNRAS/415/1061 Variability of FBS blue stellar objects (Mickaelian+ 2011)
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Beginning of ReadMe :J/MNRAS/415/1061 Variability of FBS blue stellar objects (Mickaelian+ 2011)
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Accurate photometry and variability of the FBS blue stellar objects
Mickaelian A.M., Mikayelyan G.A., Sinamyan P.K.
<Mon. Not. R. Astron. Soc. 415, 1061 (2011)>
=2011MNRAS.415.1061M
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ADC_Keywords: Blue objects ; Photometry, photographic ; Binaries, cataclysmic ;
Stars, white dwarf
Keywords: surveys - catalogues - photometry - methods: statistical - active
galactic nuclei - cataclysmic variables - white dwarfs
Abstract:
A new method for combined calculations of magnitudes based on accurate
measurements of POSS1 and POSS2 epoch plates is given. The photometric
accuracy of various surveys and catalogs has been estimated and
established and statistical weights for each of them have been
calculated. To achieve the best possible magnitudes, weighted
averaging of data from USNO-A2.0, APM, MAPS, USNO-B1.0, and GSC 2.3.2
catalogs have been used. The rms accuracy of magnitudes achieved for
POSS1 is 0.184 mag for B and 0.173 mag for R and for POSS2 is 0.138
mag for B and 0.128 mag for R. We have derived the best POSS1 and
POSS2 magnitudes for the FBS blue stellar objects. We have refined the
transformation formulae between the POSS1 and POSS2 magnitudes and
SDSS ones and standard UBV system. Using these accurate magnitudes, we
have estimated the variability of the FBS blue stellar objects and
revealed probable and possible variables. We have worked out methods
to control and exclude accidental errors that appear in any survey.
We have compared and combined our results with those given in NSVS
database and obtained better candidates for variability. Having
excluded variables, we have combined POSS1 and POSS2 data for the rest
of objects to achieve even better magnitudes and colors; the rms being
smaller than 0.1 mag both in B and R and for the B-R colors. This
approach has been applied to the First Byurakan Survey blue stellar
objects containing significant number of white dwarfs, cataclysmic
variables, as well as extragalactic objects (quasars, Seyferts, BL Lac
objects). Altogether 336 variable objects have been revealed with
POSS2-POSS1 >= 3sigma of the errors. An electronic table of these
objects is given.
Candidate variables are divided into 4 classes: extreme, strong,
probable and possible variables. For a more reliable sample of
variable objects we excluded possible ones from the list and were left
with 161 objects. Analyzing radio and X-ray properties of these
objects, we have revealed their nature and re-discovered or revealed
candidate AGN, CVs, WDs and other objects.