CC BY
0Study of Variable Stars in the Field of Open Cluster Stock 1
M. Parmanova#1, R. Gaysin#1. R. Karimov#1.0. Burkhanov#1'2. B. Satovskiy*4. B. Khafizov#1, S.A. Ehgamberdiev#1'3
#1. Astronomical Institute of the Uzbekistan Academy of Sciences, Tashkent, Uzbekistan; #2. Samarkand State University, Samarkand, Uzbekistan; #3. National University of Uzbekistan, Tashkent, Uzbekistan; #4. State Space Corporation "Roscosmos", Moscow, Russia.
ISSN 2221-0474 DOI: 10.24412/2221-0474-2024-24-2
Received: 4.12.2023; accepted: 4.03.2024
(E-mail for contact: parmanovamehriniso@pmail.com')
| # |Name|| Other Coord CJ20001 Type Max Min System Period Epoch ÎJD1 tj®e Sp. Comment L.Curve Find.Chart Data
|_11 |Gaia DR3 2021434299305459968 19 35 15.765+24 59 41.15 EB 16.23 16.74 R 0.4394 2459784.2454 Min Comm. 1 42749jh.png 42749_fchart.png 1c 42749.txt
| 21 |GaiaDR3 2021446978049705216 19 35 19.187+25 11 59.30 EB 16.12 16.46 R 0.539 2459784.4152 Min Comm. 2. 42686_ph.png 42686_fchart.png lc 42686.txt
| 3| |GaiaDR3 2021521538687523200 19 35 53.651 +25 26 17.20 DSCTC 14.578 14.605 R 0.07147 2459781.4300 Max 09983jh.png 09983 fchart.png lc 09983.txt
| 41 |GaiaDR3 2021521160730408960 19 36 07.670 +25 27 10.78 BY: 13.97 14.01 R 0.8492 Max 09376_ph.png 09376 fchart.png lc_09376.txt
| 5 | |GaiaDR3 2021428041491192960 19 36 18.142+24 59 10.62 EB 16.94 17.55 R 0.471 2459785.3252 Min Comm. 5 43778_ph.png 43778_fchart.png lc_43778.txt
| 6| |GaiaDR3 2021453575119944832 19 36 23.346+25 07 11.71 EA 15.98 16.64 R 0.784 2459785.4393 Min Comm. 6 04979_ph.png 04979_fchart.png lc 04979.txt
| 71 |GaiaDR3 2021468276749118208 19 36 53.515 +25 17 02.91 DSCTC 15.966 16.017 R 0.2069 2459785.3330 Max 18739_ph.png 18739_fchart.png lc_18739.txt
| 81 |GaiaDR3 2021452853565343104 19 36 59.882 +25 07 20.69 DSCTC 14.948 14.965 R 0.2484 2459782.3384 Max 05151_ph.png 05151 fchart.png lc 05151.txt
| 91 |Gaia DR3 2021456495697916928 19 37 03.364 +25 16 14.45 EA 15.60 15.97 R 1.347 2459788.4341 Min 19321 jh.png 1932 l_fchart.png lc_19321.txt
|101 |Gaia DR3 2021462405573585920 19 37 06.357 +25 17 29.37 EB 16.07 16.22 zr 11.5489 2458341.8267 Min Comm. 10 18512_ZTF_ph.png 18512 fchart.png lc 18512.txt
111 I iGaiaDR3 2021462336854101632 19 37 09.453 +25 16 40.96 EB 16.56 16.92 R 0.4272 2459781.42481 Min 1 Comm. 11 19093_ph.png 19093_fchart.png lc_19093.txt
1121 |GaiaDR3 2021462543012544128 19 37 12.750+25 18 21.41 EB 15.18 15.32 R 0.8360 2459781.27961 Min |_||Comm. 12 17905jh.png 17905_fchart.png lc_17905.txt
|13 | |Gaia DR3 2021455048249451264 19 37 18.958+25 12 01.45 EA 16.42 16.70 R 1.058 2459782.34881 Min M|Comm. 13 12110jh.png 1211 Ofchart.png lc 12110.txt
1141 IGaia DR3 2021450551462745344 19 37 31.203+25 05 24.47 15.77 15.94 R other Comm. 14 03857jh.png 03857_fchart.png lc 03857.txt
Comments:
1. Known variable star of EW type in the VSX. According to our data, variability type of the star is different. Minll - 16m.40.
2. Minll - 16m.26. According to the Gaia DR3 Fart 1 Main source catalog, the star is indicated as a possible variable star.
5. Known variable star of EW type in the VSX. According to our data, variability type of the star is different. Minll = 17m.15.
6. Known variable star of EA type in the VSX. Minll = 16m.33.
10. Our original observations were insufficient to determine periodicities. We used the available longer-term ZTF catalog data for this star via SNAP ZTF viewer (Malanchev et al., 2023).
11. Known variable star of EW type in the VSX. According to our data, variability type of the star is different. Minll = 16m.74.
12. Known variable star of EW-type in the VSX. According to our data, variability type of the star is different. Minll = 15m.25.
13. Twice longer period is also possible.
14. Unclassified variable star - insufficient data.
Remarks:
We present the results of searching for variable stars in the vicinity of the open cluster Stock 1 in Vulpecula with the center at a=l9h36m, 5=+25°.2(J2000.0). For 9 stars we did not find any references in the available star databases: GCVS (Samus et al., 2017), VSX. and ASAS-SN Variable Stars Database. 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 AltaU16M (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 was 30.9'x30.9'. We used Bessel R filter with exposure time 210 seconds. The temperature of the camera was set to 15°C. Calibration images: bias, dark and flat were also obtained for each observational date. Observations were carried out during the time interval fiom July 20 to July 28,2022 (JD 2459781.27 - 2459789.26). During 7 nights we obtained 466 images. All of them were processed with master bias, dark, and flat frames using standard IRAF packages. The VaST software package (Sokolovsky and Lebedev, 2018) was used to search for variable stars.
Acknowledgments: We are grateful to the staff of the Maidanak Astronomical Observatory for their efforts to support observations. We thank Dr. A. M. Zubareva for helpful discussion.
References:
Ehgamberdiev, Sh., 2018, Nature Astronomy, 2,349
Gaia Collaboration, Vallenari, A., Brown, A. G. A., et al., 2023, Astron. Astrophys., 674, Al
Malanchev, K., Kornilov, M. V., Pruzhinskaya, M. V., et al., 2023, Publ. Astron. Soc. Pacific, 135,1044
Samus, N. N., Kazarovets, E. V., Durlevich, O. V., Kireeva, N. N., Pastukhova, E. N., 2017, Astron. Rep., 61, No. 1, 80
Sokolovsky, K. V., Lebedev, A. A., 2018, Astron. Computing, 22,28
