CC BY
1Peremennye Zvezdy", Prilozhenie,
vol. 24, N 3 (2024)
New Variable Stars Discovered at Moscow Palace of Pioneers. Part 1. Eclipsing Binaries
D. Nasonov, D. Denisenko, A. Minkovsky, A. Gusev
State-Funded Professional Educational Institution "Vorobyevy Gory", Moscow, Russia
ISSN 2221-0474 DOI: 10.24412/2221-0474-2024-24-3
Received: 22.12.2023; accepted: 23.04.2024
(E-mail for contact: dmitry.sergevich@gmail.com)
# Name Other Coord (J2000) Ty.P-e Max Min System Period Epoch (JD) .type Sp Comment L.Curve Find.Chart Data
1 USN0-B1.0 0955-0346725 18 15 39.546 +05 34 22.02 EA 16.38 18.20 r 1.87526 2459017.8410 Min Comm. 1 m8ph.png m8brir.png m8zg.txt m8zr.txt m8ac.txt m8ao.txt
2 18 16 27.991 +03 19 29.55 EA/WD 17.41 17.73 r 0.2428935 2458509.0900 Min Comm. 2 m6ph.png m6brir.jpg m6zg.txt m6zr.txt
3 USN0-B1.0 0967-0400894 18 33 52.476 +06 44 49.35 EA 17.42 18.81 r 1.68741 2458667.1660 Min Comm. 3 m5ph.png m5brir.png m5zg.txt m5zr.txt m5zi.txt
4 USN0-B1.0 1030-0398784 18 42 09.980 +13 05 21.71 EA 17.42 18.23 r 1.3870743 2458773.7527 Min Comm. 4 m15ph.png m15brir.png m15zg.txt m15zr.txt
5 USN0-B1.0 1028-0439526 18 42 18.992 +12 53 09.21 EA 17.06 19.4: r 3.2214 2459818.7100 Min Comm. 5 m21ph.png m21brir.png m21zg.txt m21zr.txt m21ac.txt m21ao.txt
6 USN0-B1.0 1178-0517790 19 38 13.322 +27 53 03.81 EA 18.80 20.37 r 2.00372 2458247.9540 Min Comm. 6 m4ph.png m4brir.jpg m4zg.txt m4zr.txt m4zi.txt
7 USN0-B1.0 1231-0433523 19 43 18.625 +33 10 08.00 EA 17.52 19.90 g 2.71291 2458342.4000 Min Comm. 7 m23ph.png m23brir.png m23zg.txt m23zr.txt m23zi.txt
8 USN0-B1.0 1043-0516571 19 43 52.351 +14 21 33.58 EA 18.05 20.30 g 2.08702 2458645.9253 Min Comm. 8 m19ph.png m19brir.png m19zg.txt m19zr.txt
9 USN0-B1.0 1234-0390122 19 45 14.053 +33 29 28.19 EA 18.31 20.73 g 2.64324 2458619.4120 Min Comm. 9 m11ph.png m11brir.jpg m11zg.txt m11zr.txt m11zi.txt
10 USN0-B1.0 1299-0358589 19 50 10.140 +39 57 51.16 EA 19.62 21.5: g 2.251375 2459174.2700 Min Comm. 10 m20ph.png m20brir.png m20zg.txt m20zr.txt
11 USN0-B1.0 1286-0369685 19 53 44.553 +38 38 43.45 EA 17.51 18.77 r 5.18383 2458734.7050 Min Comm. 11 m16ph.png m16brir.png m16zg.txt m16zr.txt m16ac.txt m16ao.txt
12 USN0-B1.0 1252-0417511 20 40 16.471 +35 12 45.62 EA 17.08 18.70 r 6.25293 2456520.0200 Min Comm. 12 m17ph.png m17brir.png m17zg.txt m17zr.txt m17ac.txt m17ao.txt
13 USN0-B1.0 1221-0585747 20 43 52.872 +32 08 02.65 EA 18.17 20.7: g 2.99299 2458618.6250 Min Comm. 13 m18ph.png m18brir.png m18zg.txt m18zr.txt m18zi.txt
14 USN0-B1.0 1395-0396648 21 22 40.211 +49 35 39.19 EA 17.30 <21.0 r 43.102 2455433.600 Min Comm. 14 g4ph.png g4brir.jpg g4zg.txt g4zr.txt g4ac.txt g4ao.txt
Comments:
1. = Minkovskiy 8. Eclipse on 1993-05-27 POSS-II red plate. Min II = 16m5 r. D = 0.18 P.
2. = Minkovskiy 6. Min II = 17m56 r. FUV-NUV = - 0.22 (GALEX).
3. = Minkovskiy 5. Min II = 17m59 r. D = 0.15 P.
4. = Minkovskiy 15. Min II = 17m.88 r. D = 0.06 P.
5. = Minkovskiy 21. Min II = 17m19 r. D = 0.14 P.
6. = Minkovskiy 4. Eclipse on 1988-07-14 POSS-II blue plate. Min II = 18m91 r. D = 0.12 P.
7. = Minkovskiy 23. Min II = 17m60 g. D = 0.12 P.
8. = Minkovskiy 19. Min II = 18m36 g. D = 0.17 P.
9. = Minkovskiy 11. Min II = 18m42 r. D = 0.10 P. The variable Minkovskiy 12 from the chart will be discussed in a subsequent paper.
10. = Minkovskiy 20. D = 0.10 P.
11. = Minkovskiy 16. Min II = 17m63 r. D = 0.08 P.
12. = Minkovskiy 17. Min II = 17m19 r. D = 0.09 P.
13. = Minkovskiy 18. Min II = 18m26 g. D = 0.11 P.
14. = Gusev 4. ATLAS magnitudes partially contaminated by 2MASS J21224058+4935454 (V = 17m4; sep. 7"). D = 0.23 P. The differences of the eclipse's depth and width in different bands could not be explained so far. The variable Gusev3 from the chart will be discussed in a subsequent paper.
Remarks:
We report the discovery of the new variable stars by the students of after-school astronomy classes of the Moscow Palace of Pioneers at Vorobyovy Gory. The new variable objects were identified during 2021-2023 in the course of the PALEO project on the digitized Palomar Sky Survey plates (PALEO stands for PALomar Extinct Objects). This paper summarizes data on 14 eclipsing variable stars. Newly found cataclysmic and pulsating variables will be reported in parts 2 and 3, respectively.
The variability of the stars was suspected from visual inspection of the DSS colored maps using SIMBAD web interface. The stars displaying either unusually blue or extremely red color on the combined POSS-II blue+red plates were suspected to be variable. Then we checked in the VSX if the objects were already known as variable stars. We inspected the Catalina Real-Time Transient Survey (Drake et al., 2009), Zwicky Transient Facility Data Release 19 (Masci et al., 2019), Pan-STARRS1 Data Release 2 (Flewelling et al., 2020) and ATLAS Forced Photometry server (Heinze et al., 2018) to find light curves of the candidates, if available. The photometric time series from those surveys were then combined using the script written by D.N. and analysed with the period search software by K. Sokolovsky. The light elements were determined using Heliocentric Julian Days (HJD) of observations. Pan-STARRS1 data for the objects will be provided upon request, the data from other surveys are given in the table. Note that abbreviations zg, zr and zi are for ZTF g-, r- and i-bands, and ac and ao are for ATLAS cyan and orange bands respectively. We provide the finder charts with the variables being near the minimal brightness.
Stars' designations in table are from USNO-B1.0 catalogue (Monet et al., 2003). The coordinates of the stars were drawn from the Gaia DR3 catalogue (Gaia Collaboration, 2023). The authors thank Sebastián Otero for his valuable recommendations.
References:
Drake, A. J., Djorgovski, S. G., Mahabal, A., et al., 2009, Astrophys. J., 696, No. 1, 870
Flewelling, H. A., Magnier, E. A., Chambers, K. C. et al., 2020, Astrophys. J. Supp. Ser., 251, 7
Gaia Collaboration, Vallenari, A., Brown, A. G. A., et al., 2023, Astron. Astrophys., 674, A1
Heinze, A. N., Tonry, J. L., Denneau, L., et al., 2018, Astron. J., 156, id. 241
Masci, F. J., Laher, R. R., Rusholme, B., 2019, Publ. Astron. Soc. Pacific, 131, 018003
Monet, D. G., Levine, S. E., Canzian, B., et al., 2003, Astron. J., 125, 984
Skrutskie, M. F., Cutri, R. M., Stiening, R., et al., 2006, Astron. J., 131, 1163
