Peremennye Zvezdy

Article in PDF
"Peremennye Zvezdy",
Prilozhenie
,
vol. 24, N 2 (2024)

Study of Variable Stars in the Field of Open Cluster Stock 1

M. Parmanova#1, R. Gaysin#1, R. Karimov#1, O. 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@gmail.com)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 Gaia DR3 202143429930545996819 35 15.765 +24 59 41.15EB16.2316.74R0.43942459784.2454Min Comm. 142749_ph.png42749_fchart.pnglc_42749.txt
2 Gaia DR3 202144697804970521619 35 19.187 +25 11 59.30EB16.1216.46R0.5392459784.4152Min Comm. 242686_ph.png42686_fchart.pnglc_42686.txt
3 Gaia DR3 202152153868752320019 35 53.651 +25 26 17.20DSCTC14.57814.605R0.071472459781.4300Max  09983_ph.png09983_fchart.pnglc_09983.txt
4 Gaia DR3 202152116073040896019 36 07.670 +25 27 10.78BY:13.9714.01R0.8492 Max  09376_ph.png09376_fchart.pnglc_09376.txt
5 Gaia DR3 202142804149119296019 36 18.142 +24 59 10.62EB16.9417.55R0.4712459785.3252Min Comm. 543778_ph.png43778_fchart.pnglc_43778.txt
6 Gaia DR3 202145357511994483219 36 23.346 +25 07 11.71EA15.9816.64R0.7842459785.4393Min Comm. 604979_ph.png04979_fchart.pnglc_04979.txt
7 Gaia DR3 202146827674911820819 36 53.515 +25 17 02.91DSCTC15.96616.017R0.20692459785.3330Max  18739_ph.png18739_fchart.pnglc_18739.txt
8 Gaia DR3 202145285356534310419 36 59.882 +25 07 20.69DSCTC14.94814.965R0.24842459782.3384Max  05151_ph.png05151_fchart.pnglc_05151.txt
9 Gaia DR3 202145649569791692819 37 03.364 +25 16 14.45EA15.6015.97R1.3472459788.4341Min  19321_ph.png19321_fchart.pnglc_19321.txt
10 Gaia DR3 202146240557358592019 37 06.357 +25 17 29.37EB16.0716.22zr11.54892458341.8267Min Comm. 1018512_ZTF_ph.png18512_fchart.pnglc_18512.txt
11 Gaia DR3 202146233685410163219 37 09.453 +25 16 40.96EB16.5616.92R0.42722459781.4248Min Comm. 1119093_ph.png19093_fchart.pnglc_19093.txt
12 Gaia DR3 202146254301254412819 37 12.750 +25 18 21.41EB15.1815.32R0.83602459781.2796Min Comm. 1217905_ph.png17905_fchart.pnglc_17905.txt
13 Gaia DR3 202145504824945126419 37 18.958 +25 12 01.45EA16.4216.70R1.0582459782.3488Min Comm. 1312110_ph.png12110_fchart.pnglc_12110.txt
14 Gaia DR3 202145055146274534419 37 31.203 +25 05 24.47 15.7715.94R  other Comm. 1403857_ph.png03857_fchart.pnglc_03857.txt

Comments:


1. Known variable star of EW type in the VSX. According to our data, variability type of the star is different. MinII = 16m.40.

2. MinII = 16m.26. According to the Gaia DR3 Part 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. MinII = 17m.15.

6. Known variable star of EA type in the VSX. MinII = 16m.33.

10. Our original observations were insufficient to determine periodicities. We used the available longer-term ZTF catalog data for this star via SNAD 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. MinII = 16m.74.

12. Known variable star of EW-type in the VSX. According to our data, variability type of the star is different. MinII = 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 α=19h36m, δ=+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 Alta U16M (2K×2K) CCD camera. The physical size of a CCD pixel is 9 microns. We used 2×2 binning, which corresponds to 0.907′′/pixel, and the field of view was 30.9′×30.9′. 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 from 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, A1
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



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