CC BY
3"Peremennye Zvezdy", Prilozhenle,
vol. 23, N 3 (2023)
Discovery of 19 new variable stars in the vicinity of the young star cluster King 12. Part I
R. Gaysin#1. O. Burkhonov#12. R. Karimov*1. B. Satovskiy#3. B. Khafizov#1. S. A. Ehgamherdiev#14. M. Parmanova#1
#1. Astronomical Institute of the Uzbekistan Academy of Sciences, Tashkent, Uzbekistan; #2. Samarkand State University, Samarkand, Uzbekistan; #3. State Space Corporation "Roscosmos", Moscow, Russia; #4. National University of Uzbekistan, Tashkent, Uzbekistan.
ISSN 2221-0474 DOI: 10.24412/2221 -0474-2023-3-1
Received: 7.09.2023; accepted: 1.12.2023
(E-mail for contact: renat@astrin.uz')
# Name Other Coord (J2000) Type Max Min System Period Epoch (JD) type Sp Comment L.Curve Find.Chart Data
1 Gaia DR3 2012891162643165696 23 48 51.614 +62 05 53.84 EA 16.27 16.46 R 2.051 2459458.2318 min Comm. 1 07824_ph.png 07824 fchart.png 07824 lc.dat
2 Gaia DR3 2012896041725952512 23 49 28.664 +62 10 51.68 EW 15.45 15.56 R 0.26320 2459456.5001 min Comm. 2 06521_ph.png 06521 fchart.png 06521 lc.dat
3 Gaia DR3 2012944317160593408 23 49 32.645 +62 16 04.23 EW 16.08 16.51 R 0.35012 2459462.2760 min Comm. 3 03749_ph.png 03749 fchart.png 03749 lc.dat
4 Gaia DR3 2012896969438861440 23 49 34.180 +62 12 44.30 EA 15.50 15.92 R 1.313 2459457.2367 min Comm. 4 05936_ph.png 05936 fchart.png 05936 lc.dat
5 Gaia DR3 2012875013566366848 23 49 55.408 +61 56 46.59 EA 15.61 15.73 R 0.6946 2459458.2993 min Comm. 5 03081_ph.png 03081 fchart.png 03081 lc.dat
6 Gaia DR3 2012879789569893120 23 49 56.524 +62 02 33.29 EW: 16.71 16.95 R 0.3240 2459454.2549 min Comm. 6 08768_ph.png 08768 fchart.png 08768 lc.dat
7 Gaia DR3 2012878964936200064 23 49 56.605 +62 01 05.72 BY 16.71 16.93 R 1.82 max 04978_ph.png 04978 fchart.png 04978 lc.dat
8 Gaia DR3 2012879853981875968 23 49 57.201 +62 03 19.81 EA 17.74 18.64 R 1.1072 2459457.3312 min Comm. 8 08674_ph.png 08674 fchart.png 08674 lc.dat
9 Gaia DR3 2012879063707896960 23 50 09.305 +62 03 28.57 EA 17.85 18.55 R 0.6577 2459456.3651 min Comm. 9 04884_ph.png 04884 fchart.png 04884 lc.dat
10 Gaia DR3 2012875799532611328 23 50 19.315 +62 00 19.22 EW 15.88 16.44 R 0.40250 2459459.1630 min Comm. 10 05160_ph.png 05160 fchart.png 05160 lc.dat
11 Gaia DR3 2012969399772254080 23 50 34.070 +62 00 04.02 EW 16.75 17.25 R 0.3088 2459453.2336 min Comm. 11 05257_ph.png 05257 fchart.png 05257 lc.dat
12 Gaia DR3 2012985995521172736 23 50 43.386 +62 09 57.06 EW 15.75 16.25 R 0.25938 2459453.2587 min Comm. 12 06850_ph.png 06850 fchart.png 06850 lc.dat
13 Gaia DR3 2012969910861070592 23 50 57.367 +62 04 09.22 BY 16.92 17.13 R 1.58 max 08396_ph.png 08396 fchart.png 08396 lc.dat
14 Gaia DR3 2012987640484769280 23 51 12.986 +62 15 38.74 EA 17.20 18.80 R 2459460.3493 min Comm. 14 48405_ph.png 48405 fchart.png 48405 lc.dat
15 Gaia DR3 2012976271715231872 23 51 40.115 +62 12 20.25 BY: 16.48 16.63 R 0.711 2459457.147 max 06189_ph.png 06189 fchart.png 06189 lc.dat
16 Gaia DR3 2012974897325849984 23 51 41.104 +62 08 21.27 DSCT 16.20 16.29 R 0.17203 2459453.2790 max 07321_ph.png 07321 fchart.png 07321 lc.dat
17 Gaia DR3 2012971014675504384 23 52 10.202 +62 07 09.35 EW 16.65 16.86 R 0.62381 2459460.3673 min Comm. 17 07634_ph.png 07634 fchart.png 07634 lc.dat
18 Gaia DR3 2012972075524373248 23 52 02.850 +62 09 14.42 EW 16.83 17.02 R 0.7575 2459453.2835 min Comm. 18 07071_ph.png 07071 fchart.png 07071 lc.dat
19 Gaia DR3 2012789419152099968 23 52 56.689 +62 08 18.14 EA 15.42 16.19 R 0.6394 2459460.1761 min Comm. 19 28604_ph.png 28604 fchart.png 28604 lc.dat
Comments:
1. MinlI = 16m41.
2. MinlI = 15m55.
3. Minll = 16m.46.
4. Minll = 15m85.
5. Minll = 15m64.
6. Minll = 16m90.
8. Minll = 18m4.
9. Minll = 18m40.
10. MinII = 16m.39.
11. Minll = 17m15.
12. Minll = 16m15.
14. Our dataset is not long enough to derive light elements for this Algol variable.
17. Minll = 16m77.
18. MinII = 16m.96.
19. Minll = 15m71. Remarks:
We present the results of searching for variable stars in a field in Cassiopea with the center at a= 23h50m, S=+61°56' (J2000.0) near the young open star cluster King12. The field of view is 30'. We inspected the available databases containing information on variable stars: GCVS (Samus et al., 2017), VSX, ZTF (Chen et al., 2020) and ASAS-SN Variable Stars Database and found no records for the objects listed in the table. The coordinates were extracted from Gaia DR3 (Gaia Collaboration et al., 2023).
Our observations were carried out at the Maidanak Astronomical Observatory of the Astronomical Institute of the Academy of Sciences of the Republic of Uzbekistan (Ehgamberdiev, 2018) using the 0.5-meter AMT-1 telescope with Mathis Instruments MI-750/1000 equatorial fork mount equipped with an Apogee Alta U16M (2Kx2K) CCD camera. The physical size of a CCD pixel is 9 microns. We used 2x2 binning, which corresponds to 0.907''/pixel, and the field of view of 30.9'x30.9'. The exposure times were 180 seconds in the Bessel R filter. The temperature of the camera was set to 15°C. Calibration images as bias, dark and flat were also obtained for each observational date. The photometric dataset was obtained during the time interval from August 26 to September 4, 2021 (JD 2459453.222459462.50). During 10 nights 512 frames were taken. All images were processed with master bias, dark, and flat frames using standard IRAF packages. We rejected low-quality images, and the final sample contained 503 images. The VaST (Variability Search Toolkit) software package (Sokolovsky and Lebedev, 2018) was used to search for variable stars. To derive periods, we used the period search tool by Dr. K.V. Sokolovsky who incorporated it in his VaST package.
Acknowledgments: We are grateful to the staff of the Maidanak Astronomical Observatory for their efforts to support observations. References:
Chen, X., Wang, S., Deng, L., et al., 2020, Astrophys. J. Suppl. Ser., 249, 18. Ehgamberdiev, Sh., 2018, Nature Astronomy, 2, 349.
Gaia Collaboration, Creevey, O. L., Sarro, L. M., et al., 2023, Astron. Astrophys., 674, id. A39.
Samus, N. N., Kazarovets, E. V., Durlevich, O. V., Kireeva, N. N., and Pastukhova, E. N., 2017, Astron. Rep., 61, No. 1, 80. Sokolovsky, K. V. and Lebedev, A. A., 2018, Astron. Computing, 22, 28.
