Journal "Peremennye Zvezdy"

"Peremennye Zvezdy",
Prilozhenie,
vol. 22, N 2 (2022)

New variable stars in Lacerta: area of 2°.3×2°.3, center α=22h50m δ=54°00′. Part III

E. G. Lapukhin^#1, A. M. Zubareva^#2,3, E. Kryukova^#1, F. Khamrakulov^#4
#1. Siberian State Aerospace University, Krasnoyarsk, Russia;
#2. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia;
#3. Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia;
#4. Samarkand State University, Samarkand, Republic of Uzbekistan.

ISSN 2221–0474

DOI: 10.24412/2221-0474-2022-2

Received: 3.12.2016; accepted: 1.11.2022
(E-mail for contact: slovoktk@mail.ru)

#	Name	Other	Coord (J2000)	Type	Max	Min	Period	Epoch (JD)	type	Comment	L.Curve	Find.Chart	Data
1		2MASS 22532408+5423289	22 53 24.088 +54 23 28.97	EA	15.03	15.3	0.509428:	2456934.137	min	Comm. 1	lc54533.png	ch54533.png	out54533.dat
2		2MASS 22532409+5324222	22 53 24.090 +53 24 22.21	EW	12.33	12.4	0.60083	2456927.281	min	Comm. 2	lc13629.png	ch13629.png	out13629.dat
3		2MASS 22532818+5334536	22 53 28.181 +53 34 53.64	LB	12.67	12.87			other	Comm. 3	lc17980.png	ch17980.png	out17980.dat
4		2MASS 22533548+5346092	22 53 35.490 +53 46 09.27	EW	16.3	17.0	0.46748	2456917.177	min	Comm. 4	lc22816.png	ch22816.png	out22816.dat
5		2MASS 22533678+5441190	22 53 36.788 +54 41 19.01	SR	12.44	12.71	96:		other	Comm. 5	lc46812.png	ch46812.png	out46812.dat
6		2MASS 22534821+5423484	22 53 48.220 +54 23 48.45	SR:	13.07	13.14	46.3	2456929.5	max	Comm. 6	lc54935.png	ch54935.png	out54935.dat
7		2MASS 22541998+5430327	22 54 19.980 +54 30 32.77	EB	14.59	14.98	0.58539	2456928.184	min	Comm. 7	lc52457.png	ch52457.png	out52457.dat
8		2MASS 22542352+5349027	22 54 23.526 +53 49 02.76	EA	15.6	16.01	1.89908:	2456892.323	min		lc23790.png	ch23790.png	out23790.dat
9		2MASS 22542544+5336021	22 54 25.442 +53 36 02.14	EB	14.46	14.63	0.56104	2456892.299	min	Comm. 9	lc18401.png	ch18401.png	out18401.dat
10		2MASS 22542579+5416414	22 54 25.791 +54 16 41.43	EA	14.68	14.98	0.85572	2456928.286	min	Comm. 10	lc39926.png	ch39926.png	out39926.dat
11		2MASS 22542644+5421034	22 54 26.441 +54 21 03.50	EW	15.66	15.83	0.53399	2456928.371	min	Comm. 11	lc44669.png	ch44669.png	out44669.dat
12		2MASS 22543337+5417584	22 54 33.379 +54 17 58.50	EW	14.37	14.61	0.37325	2456928.235	min	Comm. 12	lc39105.png	ch39105.png	out39105.dat
13		2MASS 22544133+5329122	22 54 41.331 +53 29 12.24	EA	12.49	13.2	1.30335	2456928.239	min	Comm. 13	lc15236.png	ch15236.png	out15236.dat
14		2MASS 22544408+5337353	22 54 44.086 +53 37 35.36	EA	16.2	16.8	1.3475:	2456928.301	min	Comm. 14	lc19173.png	ch19173.png	out19173.dat
15		2MASS 22544638+5427196	22 54 46.381 +54 27 19.61	BY:	13.004	13.041	0.6278	2456928.267	min	Comm. 15	lc53459.png	ch53459.png	out53459.dat
16		2MASS 22545028+5414168	22 54 50.288 +54 14 16.83	EA	15.19	15.75	1.6098	2456918.153	min	Comm. 16	lc40845.png	ch40845.png	out40845.dat
17		2MASS 22545244+5304362	22 54 52.446 +53 04 36.25	SR:	12.89	13.04	59.60:	2456201.268	max	Comm. 17	lc05372.png	ch05372.png	out05372.dat
18		2MASS 22545361+5340179	22 54 53.618 +53 40 17.99	BY:	12.87	12.89	0.4434	2456894.339	max	Comm. 18	lc20068.png	ch20068.png	out20068.dat
19		2MASS 22545464+5428044	22 54 54.646 +54 28 04.41	CEP:	13.15	13.27	2.1934:	2456928.351	max		lc53075.png	ch53075.png	out53075.dat
20		2MASS 22551126+5400176	22 55 11.266 +54 00 17.62	LB	12.81	13.01			other	Comm. 20	lc28206.png	ch28206.png	out28206.dat
21		2MASS 22551430+5312512	22 55 14.304 +53 12 51.21	EW	12.82	12.95	0.597248	2456929.138	min	Comm. 21	lc08520.png	ch08520.png	out08520.dat
22		2MASS 22551533+5322539	22 55 15.331 +53 22 53.97	EA	15.37	16.43	1.17671	2456929.159	min	Comm. 22	lc12868.png	ch12868.png	out12868.dat
23		2MASS 22551856+5413496	22 55 18.564 +54 13 49.67	DSCT	12.545	12.561	0.0844756	2456917.255	max		lc41125.png	ch41125.png	out41125.dat
24		2MASS 22552642+5403542	22 55 26.425 +54 03 54.27	EB	14.65	15.03	0.76863	2456917.123	min	Comm. 24	lc29859.png	ch29859.png	out29859.dat
25		2MASS 22552898+5400596	22 55 28.982 +54 00 59.64	EW	13.86	13.95	0.278628	2456928.225	min	Comm. 25	lc28532.png	ch28532.png	out28532.dat
26		2MASS 22553041+5322029	22 55 30.416 +53 22 02.91	EW	15.31	15.68	0.39123	2456928.067	min	Comm. 26	lc12364.png	ch12364.png	out12364.dat
27		2MASS 22553084+5437189	22 55 30.843 +54 37 18.97	LB	12.62	13.44			other	Comm. 27	lc49447.png	ch49447.png	out49447.dat
28		2MASS 22553162+5344346	22 55 31.627 +53 44 34.63	BY	12.86	12.9	1.4243:	2456927.193	max		lc21553.png	ch21553.png	out21553.dat
29		2MASS 22554011+5424335	22 55 40.119 +54 24 33.53	LB	13.58	13.95			other	Comm. 29	lc47153.png	ch47153.png	out47153.dat
30		2MASS 22554204+5410475	22 55 42.042 +54 10 47.58	EA	16.16	16.9	2.4678	2456927.282	min	Comm. 30	lc42331.png	ch42331.png	out42331.dat
31		2MASS 22555437+5459127	22 55 54.375 +54 59 12.75	EA	13.62	14.01	2.57461	2456894.304	min	Comm. 31	lc36753.png	ch36753.png	out36753.dat
32		2MASS 22555603+5341393	22 55 56.034 +53 41 39.36	EA	14.82	15.32	0.79954	2456927.219	min	Comm. 32	lc20581.png	ch20581.png	out20581.dat
33		2MASS 22555732+5406531	22 55 57.321 +54 06 53.18	EA	15.48	15.7	1.7663	2456927.241	min	Comm. 33	lc31040.png	ch31040.png	out31040.dat
34		2MASS 22555929+5435258	22 55 59.298 +54 35 25.81	EA	14.24	14.5	2.6315	2456918.073	min	Comm. 34	lc50543.png	ch50543.png	out50543.dat
35		2MASS 22560506+5308282	22 56 05.070 +53 08 28.22	EA	12.12	12.22	6.55:	2456928.139	min		lc06684.png	ch06684.png	out06684.dat
36		2MASS 22560613+5313389	22 56 06.131 +53 13 38.91	EW	16.24	16.9:	0.6653	2456906.765	min	Comm. 36	lc08977.png	ch08977.png	out08977.dat
37		2MASS 22563076+5256094	22 56 30.760 +52 56 09.44	EA	15.31	15.81	1.5789:	2456892.196	min	Comm. 37	lc01931.png	ch01931.png	out01931.dat
38		2MASS 22563547+5334378	22 56 35.475 +53 34 37.86	EW	15.7	15.95	0.67926	2456918.512	min	Comm. 38	lc17564.png	ch17564.png	out17564.dat
39	GZ Lac	2MASS 22563921+5348264	22 56 39.219 +53 48 26.47	EA	15.22	16.59	1.8392	2456917.307	min	Comm. 39	lc23049.png	ch23049.png	out23049.dat
40		2MASS 22564126+5423467	22 56 41.266 +54 23 46.71	EA	14.75	15.19	1.31587	2456927.199	min	Comm. 40	lc55278.png	ch55278.png	out55278.dat
41	HI Lac	2MASS 22564866+5347476	22 56 48.665 +53 47 47.67	EA	14.73	<16.7	1.04243	2456892.323	min	Comm. 41	lc22929.png	ch22929.png	out22929.dat
42		2MASS 22565543+5426470	22 56 55.436 +54 26 47.04	HADS	15.59	15.76	0.048344	2456927.217	max		lc53116.png	ch53116.png	out53116.dat
43		2MASS 22565839+5356393	22 56 58.398 +53 56 39.38	BY	14.47	14.55	4.2734:	2456227.316	min		lc26640.png	ch26640.png	out26640.dat
44		2MASS 22570008+5349082	22 57 00.084 +53 49 08.29	DSCT	13.92	13.98	0.12813	2456928.159	max		lc23412.png	ch23412.png	out23412.dat
45		2MASS 22570086+5449295	22 57 00.866 +54 49 29.51	DSCT	12.68	12.71	0.1587278	2456934.197	max		lc38572.png	ch38572.png	out38572.dat
46		2MASS 22571126+5353287	22 57 11.264 +53 53 28.76	BY:	13.31	13.46	0.51897	2456928.284	max	Comm. 46	lc25151.png	ch25151.png	out25151.dat
47		2MASS 22571252+5421509	22 57 12.530 +54 21 50.97	EW	15.32	15.55	0.40252	2456892.402	min	Comm. 47	lc45181.png	ch45181.png	out45181.dat
48		2MASS 22571868+5413015	22 57 18.684 +54 13 01.55	EW	14.54	15.23	0.33864	2456928.163	min	Comm. 48	lc41328.png	ch41328.png	out41328.dat
49		2MASS 22574040+5329269	22 57 40.410 +53 29 27.00	HADS	15.28	15.39	0.150905	2456892.176	max		lc15128.png	ch15128.png	out15128.dat

Comments:

1. Min_II = 15^m.05. D = 0.1 P.

2. Min_II = 12^m.37.

3. J = 8^m.425, H = 7^m.401, K = 7^m.055 (2MASS). NSVS catalog entry: Object ID 3472469.

4. Min_II = 16^m.7.

5. J = 8^m.328, H = 7^m.257, K = 6^m.849 (2MASS). NSVS catalog entry: Object ID 3471820.

6. J = 9^m.743, H = 8^m.733, K = 8^m.433 (2MASS).

7. Min_II = 14^m.82. O'Connell effect.

9. Min_II = 14^m.55.

10. Min_II = 14^m.8. D = 0.16 P.

11. Min_II = 15^m.75.

12. Min_II = 14^m.61.

13. Min_II = 13^m.14. D = 0.12 P.

14. Min_II = 16^m.8.

15. J = 11^m.655, H = 11^m.341, K = 11^m.258 (2MASS).

16. Min_II = 15^m.55:. D = 0.18 P.

17. J = 10^m.889, H = 10^m.256, K = 10^m.108 (2MASS).

18. J = 11^m.772, H = 11^m.502, K = 11^m.438 (2MASS).

20. J = 8^m.587, H = 8^m.588, K = 7^m.125 (2MASS). NSVS catalog entry: Object ID 3473769.

21. Min_II = 12^m.92. O'Connell effect.

22. Min_II = 15^m.46. D = 0.16 P.

24. Min_II = 14^m.80.

25. Min_II = 13^m.94.

26. Min_II = 15^m.63.

27. J = 9^m.232, H = 8^m.059, K = 7^m.667 (2MASS).

29. J = 9^m.671, H = 5^m.549, K = 8^m.167 (2MASS).

30. Twice shorter period (1.2339 d) is possible.

31. D = 0.16: P. Twice longer period is possible.

32. Min_II = 15^m.2. D = 0.16 P.

33. Min_II = 15^m.68. D = 0.10: P.

34. D = 0.16: P. Twice longer period is possible.

36. Min_II = 16^m.8:.

37. Twice longer period is possible.

38. Min_II = 15^m.93.

39. Min_II = 15^m.44.

40. Min_II = 15^m.04. D = 0.17 P.

41. Min_II = 14^m.88. D = 0.18 P.

46. The star became brighter by 0^m.06 between 2012 and 2014. The magnitude ranges within the observational seasons are: 13^m.31–13^m.36 in 2012, 13^m.36–13^m.46 in 2014.

47. Min_II = 15^m.53.

48. Min_II = 15^m.04.

Remarks:
We present the third part of our discoveries of variable stars in Lacerta: area of 2°.3×2°.3, centered at α=22h50m δ=54°00′. Some of the objects are newly discoveries, some are already known from large scale surveys like ZTF and ASAS-SN.

Our observations of an area in Lacerta were performed at the observatory of the Reshetnev Siberian State University of Science and Technology with a Hamilton telescope (D = 400 mm, F = 915 mm), equipped with an FLI ML9000 CCD chip (3056×3056 pixels, pixel size 12 μm). Exposures of all frames were 30 seconds. A CCD image covers 2°.3×2°.3 of the sky.
All unfiltered CCD observations were obtained during two time intervals: August–October 2012 and September–October 2014.
The magnitudes were referred to those of comparison stars (in unfiltered red band) from the UCAC4 catalog (Zacharias et al. 2013) using VaST software(Sokolovsky and Lebedev 2018). We also used VaST to search for new variable stars. To define periods, we applied WinEfk software provided by Dr. V. P. Goranskij.
This work was supported by Ministry of Education and Science of Russian Federation within limits of state contract 3.6822.2017/7.8.

Acknowledgements: The authors wish to thanks Dr. V. P. Goranskij for providing his efficient period-search software and Dr. K. V. Sokolovsky for providing VaST (a software package for detection of variable objects on a series of astronomical images).

References:
Sokolovsky, K. V., Lebedev, A. A., 2018, Astron. and Computing, 22, 28
Zacharias, N., Finch, C. T., et al., 2013, The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)