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J/other/RAA/18.92 New variable stars in 104 Her field (Antipin+, 2018)
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Beginning of ReadMe :J/other/RAA/18.92 New variable stars in 104 Her field (Antipin+, 2018)
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New variable stars from the photographic archive: semi-automated discoveries,
attempts at automatic classification and the new field 104 Her.
Antipin S.V., Becker I., Belinsky A.A., Kolesnikova D.M., Pichara K.,
Samus N.N., Sokolovsky K., Zharova A.V., Zubareva A.M.
<Res. Astron. Astrophys., 18, 92 (2018)>
=2018RAA....18...92A (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, variable ; Photometry
Keywords: techniques: photometric
Abstract:
Using 172 plates taken with the 40-cm astrograph of the Sternberg
Astronomical Institute (Lomonosov Moscow University) in 1976-1994
and digitized with a resolution of 2400 dpi, we discovered and studied
275 new variable stars. We present the list of our new variables with
all necessary information concerning their brightness variations. As
in our earlier studies, the new discoveries show a rather large number
of high-amplitude Delta Scuti variables, predicting that many stars of
this type remain not detected in the whole sky. We also performed
automated classification of the newly discovered variable stars based
on the Random Forest algorithm. The results of the automated
classification were compared to traditional classification and showed
that automated classification was possible even with noisy
photographic data. However, further improvement of automated
techniques is needed, which is especially important when considering
the very large numbers of new discoveries expected from all-sky
surveys.
Description:
Scanning of the plates in the Moscow collection was started in 2006
using two CREO EverSmart Supreme scanners, with resolution of about
2500 dpi. Unfortunately, electronic components in these scanners
malfunctioned several years later and could not be repaired. In 2013,
following advice from M.K. Tsvetkov, we purchased an Epson Expression
11000XL scanner and continued digitizing our collection using a
resolution of 2400 dpi. Due to requirements for funding in Russian
science, we decided to arrange the work so that scientific results
would not be delayed till the scanning of the whole collection was
completed. After finishing digitizing a field, we search for variable
stars using the scans and study the discovered variables.
The plate stacks of the SAI contain 172 plates centered at the star
104 Her (l=58deg, b = 22deg; 1976 March 31 - 1994 October 8). The
light curves of the variables can be found at our web site
(http://www.sai.msu.su/gcvs/digit/digit.html).