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J/AZh/91/382 New variable stars in field SA9 (Sokolovsky+, 2014)
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Beginning of ReadMe :J/AZh/91/382 New variable stars in field SA9 (Sokolovsky+, 2014)
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New variable stars on digitized plates of the Moscow collection. Field SA9.
Sokolovsky K.V., Antipin S.V., Zubareva A.M., Kolesnikova D.M.,
Lebedev A.A., Samus N.N., Sat L.A.
<Astron. Zh. 91, 382 (2014)>
=2014AZh....91..382S
=2014ARep...58..319S
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ADC_Keywords: Stars, variable ; Photometry
Abstract:
The new stage of work on digitizing the astronomical plates of the
Sternberg Astronomical Institute's collection and searching for new
variable stars using the digitized photographic plates includes a
considerable improvement of the automated search techniques for
objects with variable brightnesses. In particular, the technique for
taking into account the non-linear response of the photographic light
detector has been improved. Applying the improved techniques to 182
digitized images of a 10degx10deg field centered at SA9, obtained
from scanning photographic plates taken with the Sternberg
Astronomical Institute 40-cm astrograph, has enabled the discover and
study of 77 new variable stars (MDV 519-595). These include 3
Cepheids, 2 probableBY Draconis stars, 65 eclipsing binaries, 3RR
Lyrae stars, 1 high-amplitude delta Scuti star (HADS), and 3
irregular variables. Special CCD observations have confirmed the
presence of brightness variations in 7 of the 77 variables that were
initially considered uncertain.
Description:
This new paper presents the results of a search for and study of new
variables using scans of plates from the 40-cm astrograph in a field
centred on Kapteyn's area SA9. According to Kapteyn's scheme, this
area is located around the star BD +60 636 = HIP 14833 (03:11:31.7,
+60 38 06, J2000.0). This star is close to, but not always coincident
with, the centers of the studied plates. The exposure time of this
area was most often 45-min, so that the limiting magnitude of
good-quality plates is about 17.5^m^B.
Individual light curves are available at
http://www.sai.msu.su/groups/cluster/gcvs/digit/mdv/data/mdvNNN.dat