Light Elements and Other Photometric Parameters for Twenty Two Variable Stars

E. V. Kazarovets
Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia

Received:   18.11.2025;   accepted:   8.12.2025
(E-mail for contact: helene@inasan.ru)

Comments:


1. = GSC 04026-00677. zg = 14.27–15.30, D = 0.015 P. Twice longer period is possible. Combined photometry in ZTF r-band and R-band near minimum published by Popov and Zubareva (2022) was used for period determination. Magnitudes in R-band were adjusted by -0.3 mag. The variability of EA type was discovered by Popov and Zubareva (2022), but only one minimum was detected.

2. = USNO-A2.0 1500-01640775. MinII = 17.22 zr, D = 0.06 P. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and incorrect P = 2.10795 d.

3. = GSC 08181-02326. M–m = 0.48 P. V = 13.64–13.68. Additional period P = 0.092813 d is clearly present at the power spectrum. This mode is probably nonradial. The variability was discovered by Csizmadia et al. (2016) as DSCT type with P ~ 0.1 d.

4. = USNO-A2.0 0825-12358286. MinII = 16.72 zr, D = 0.08 P. zg = 17.73–18.50, MinII = 17.89 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 0.78236 d.

5. = USNO-A2.0 0825-13350978. MinII = 15.92 g. The variability was reported by Henden and Stone (1998) without any type or period. The star is included in the ASAS-SN Variable Stars Database (Jayasinghe et al., 2018) with the type VAR but no period.

6. = USNO-A2.0 1425-12389311. MinII = 17.29 zr, D = 0.07 P. Eccentric orbit: MinII–MinI = 0.286 P. zg = 17.47–18.14, MinII = 17.76 zg. The variable is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 0.270836 d. The star was also independently discovered by Khamrakulov et al. (2023) with the type EA and twice longer P = 9.975 d.

7. = USNO-A2.0 1425-12392639. MinII = 15.81 zr, D = 0.02 P. Eccentric orbit: MinII–MinI = 0.156 P. zg = 16.52–16.77, MinII = 16.65 zg. The variability was discovered by Khamrakulov et al. (2023) with uncertain type EA:, because only one minimum was observed.

8. = USNO-A2.0 1425-12405340. MinII = 17.79 zr, D = 0.03 P. zg = 18.49–19.01, MinII = 18.94 zg. The variability was discovered by Khamrakulov et al. (2023) with the type EA and twice shorter P = 3.833 d.

9. = USNO-A2.0 1425-12415313. MinII = 15.81 zr, D = 0.05 P. Eccentric orbit: MinII–MinI = 0.470 P. zg = 16.89–17.28, MinII = 17.27 zg. The variability was discovered by Khamrakulov et al. (2023) with uncertain type EA:, because only one minimum was observed.

10. = USNO-A2.0 1425-12434698. MinII = 16.58 zr, D = 0.05 P. Apsidal motion, P = 3.00671 d for MinII. zg = 16.88–17.46, MinII = 17.11 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 4.47253 d. Was also independently discovered by Khamrakulov et al. (2023) with the type EA and twice longer P = 6.012 d.

11. = USNO-A2.0 1425-12472259. MinII = 16.34 zr, D = 0.015 P. Eccentric orbit: MinII–MinI = 0.283 P. zg = 17.46 - 17.98, MinII = 17.96 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 11.8937 d. Was also independently discovered by Khamrakulov et al. (2023) with uncertain type EA:, because only one minimum was observed.

12. = USNO-A2.0 1575-05047588. MinII = 19.09 zr, D = 0.02 P. Eccentric orbit: MinII–MinI = 0.518 P. zg = 19.73 - 20.38, MinII = 19.98 zg. The variability was reported by Liakos and Nanouris (2014) with the type EA without period and magnitude range; only one MinI was observed.

13. = USNO-A2.0 1425-14245136. MinII = 15.03 zr, D = 0.05 P. zg = 15.36 - 16.33, MinII = 15.81 zg. The variable is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 1.31903 d.

14. = USNO-A2.0 1425-14276566. MinII = 16.35 zr, D = 0.05 P. zg = 16.65–17.08, MinII = 16.97 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and incorrect P = 3.40397 d. Was also independently discovered by Lapukhin et al. (2022) with the type EA and erroneous P = 1.3475: d.

15. = GSC 03985-00207. EA type light elements are given in the table, photometric parameters are zg = 12.89–13.28, Min II = 13.14 zg, D = 0.04 P. Eccentric orbit: MinII–MinI = 0.627 P. DSCTC type light elements: HJD Max = 2460194.789 + 0.0836790 x E, zg = 12.87–12.91. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 47.76 d. Variability was independently discovered by Lapukhin et al. (2022) with the type DSCT and incorrect P = 0.0844756 d.

16. = GSC 03985-01182. MinII = 12.67 g, D = 0.03 P. V = 12.22–12.32, MinII = 12.31 V. Variability was discovered by Lapukhin et al. (2022) with the type EA and erroneous P = 6.55: d.

17. = USNO-A2.0 1425-14324096. MinII = 16.24 zg, D = 0.05 P. Eccentric orbit: MinII–MinI = 0.664 P. zr = 15.20–15.61, MinII = 15.59 zr. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 5.018 d. Variability was independently discovered by Lapukhin et al. (2022) with the type EA and P = 1.5789: d or twice longer.

18. = USNO-A2.0 1500-10078285. MinII = 18.54 zr, D = 0.12 P. zg = 19.31–19.80, MinII = 19.70 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and 1.5 times longer P = 1.47929 d. Variability was independently discovered by Gaysin et al. (2023) with the type EA and 1.5 times shorter P = 0.6577 d.

19. = USNO-A2.0 1500-10194107. MinII = 17.18 zr, D = 0.06 P. Eccentric orbit: MinII–MinI = 0.306 P. zg = 17.46–18.07, MinII = 17.82 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and P = 5.1942 d. Variability was independently discovered by Burkhonov et al. (2022) with the type EA and incorrect P = 5.183 d.

20. = USNO-A2.0 1500-10209643. MinII = 17.78 zr, D = 0.02 P. Eccentric orbit: MinII–MinI = 0.368 P. zg = 18.09–18.63, MinII = 18.63 zg. The object is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 1.02323 d. Variability was independently discovered by Burkhonov et al. (2022) with the type EA but only one minimum was detected.

21. = USNO-A2.0 1500-10242922. MinII = 16.46 zr, D = 0.06 P. zg = 16.83–17.03, MinII = 17.01 zg. The variable is included in the Gaia DR3 catalogue of variable stars (Gaia Collaboration, 2022) with the type E and erroneous P = 0.65337 d. Variability was independently discovered by Burkhonov et al. (2022) with the type EA and a twice shorter P = 1.5154 d.

22. = USNO-A2.0 1500-10244847. MinII = 16.70 zr, D = 0.005 P. Eccentric orbit: MinII–MinI = 0.480 P. Combined photometry in ZTF r-band, ZTF g-band (near minimum) and R-band from Burkhonov et al. (2022) was used for period determination. Magnitudes in R-band were adjusted by +0.25 mag, in zg-band - by -0.79 mag. Variability was discovered by Burkhonov et al. (2022) with the type EA but only one minimum was detected.

Remarks:
While working on compiling of the next Name-List for Version 5.1 of the General Catalogue of Variable Stars (GSVS, Samus et al. 2017), I determined types, light elements and improved coordinates for new variable stars, discovered and published by other authors to transfer them to the GCVS. The study of the presented 22 variables was made using the publicly available electronic archives of CCD observations of the Sky Patrol All-Sky Automated Survey for Supernovae (ASAS-SN) project (Shappee et al., 2014; Kochanek et al., 2017) and the Zwicky Transient Facility (ZTF) photometric data (Bellm et al., 2019; Masci et al., 2019) via the SNAD ZTF viewer (Malanchev et al., 2023). To find periods, I applied the WinEfk software provided by Dr. V.P. Goranskij and the online light curve analysis tool developed by Dr. K.V. Sokolovsky. The coordinates of the stars were drawn from the Gaia DR3 catalogue (Gaia Collaboration, 2023).

References:
Bellm, E.C., Kulkarni, S.R., Graham, M.J., et al., 2019, Publ. Astron. Soc. Pacific, 131, No. 995, id. 018002
Burkhonov, O., Egamberdiev, S., Satovskiy, B., et al., 2022, Perem. Zvezdy Prilozh. (Var. Stars Suppl.), 22, No. 3
Csizmadia, Sz., Sedaghati, E., and Boffin, H.M.J., 2016, Inform. Bull. Var. Stars, No. 6200, 12
Gaia Collaboration, 2022, Gaia DR3 Part 4. Variability, CDS I/358
Gaia Collaboration, Vallenari, A., Brown, A.G.A., et al., 2023, Astron. Astrophys., 674, A1
Gaysin, R., Burkhonov, O., Karimov, R., et al., 2023, Perem. Zvezdy Prilozh. (Var. Stars Suppl.), 23, No. 3
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Liakos, A. & Nanouris, N., 2014, Inform. Bull. Var. Stars, No. 6200, 4
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