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A search for new variable stars using digitized Moscow collection platesKirill Sokolovsky, Sergei Antipin, Daria Kolesnikova, Alexandr Lebedev, Nikolai Samus, Lyudmila Sat, Alexandra Zubareva By digitizing astronomical photographic plates one may extract full information stored on them, something that could not be practically achieved with classical analogue methods. We are developing algorithms for variable objects search using digitized photographic images and apply them to 30cm (10x10 deg. field of view) plates obtained with the 40cm astrograph in 1940-90s and digitized with a flatbed scanner. Having more than 100 such plates per field, we conduct a census of high-amplitude (>0.3m) variable stars changing their brightness in the range 13<m<17 on timescales from hours to years in selected sky regions. This effort led to discovery of ~1000 new variable stars. We estimate that 1.2 +/- 0.1% of all stars show easily-detectable light variations; 0.7 +/- 0.1% of the stars are eclipsing binaries (64 +/- 4% of them are EA type, 22 +/- 2% are EW type and 14 +/- 2% are EB type); 0.3 +/- 0.1% of the stars are red variable giants and supergiants of M, SR and L types.
New Variable Stars Discovered by the NMW SurveyK. V. Sokolovsky, S. A. KorotkiyTwo 7.8° × 5.9° fields in Cassiopeia (136 images centered at α = 00:59:05, δ = +63:31:01, J2000) and Puppis (92 images centered at α = 08:14:06, δ = –24:00:00, J2000) are investigated using the New Milky Way (NMW) survey archive (Sokolovsky, Korotkiy & Lebedev 2013). The images are obtained with an unfiltered wide-field camera (F=135mm f/2.0 lens + ST8300M CCD) operated by the Ka-Dar Observatory in Karachay-Cherkessia, Russia. VaST software (Sokolovsky & Lebedev 2005) is used for image processing. The magnitude scale is calibrated using V magnitudes of Tycho-2 (Hog et al., 2000) stars in the field of view. The NSVS (Woźniak et al. 2004) and ASAS-3 (Pojmanski 2002) data are used to supplement the NMW survey photometry. Coordinates of the newly identified variable stars are drawn from the Tycho-2 catalog with the exception of 2MASS J00465096+6017454, 2MASS J01115454+6304596, and 2MASS J08160470-2307275 for which the positions are taken from the 2MASS catalog (Skrutskie et al. 2006). The suggested spectral classification is based on 2MASS infrared colors (Bessell & Brett 1988). The online lightcurve analysis tool developed by one of the authors (KVS) was used for period analysis.
ПЗП вышла заметка с описанием 9 новых переменок открытых по данным нашего со Стасом скромного обзора Млечного Пути
В результате поисковых работ в созвездии Малой Медведицы в ночь со 2 на 3 декабря открыта , новая переменная, предположительно звезда типа RR Лиры
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Тема: Новые переменные звезды (Прочитано 182348 раз)
