Journal "Peremennye Zvezdy"

"Peremennye Zvezdy",
Prilozhenie,
vol. 21, N 3 (2021)

New Variable Stars in Lacerta: Area of 2°.3×2°.3, Center α=22h50m δ=54°00′ (2000.0). Part II

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: 10.24412/2221-0474-2021-3

Received: 3.12.2016; accepted: 31.08.2021
(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 22484859+5318405	22 48 48.599 +53 18 40.59	EW	15.86	16.26	0.50644	2456928.181	min	Comm. 1	lc12353.png	ch12353.png	out12353.dat
2		2MASS 22485138+5501209	22 48 51.381 +55 01 20.96	DSCT	13.39	13.43	0.0929717	2456929.171	max	Comm. 2	lc34651.png	ch34651.png	out34651.dat
3		2MASS 22485457+5405219	22 48 54.570 +54 05 21.97	SR:	14.33	14.44	27.7:	2456926.3	max	Comm. 3	lc31653.png	ch31653.png	out31653.dat
4	FR Lac	2MASS 22485788+5412354	22 48 57.884 +54 12 35.46	EA	14.58	15.51	0.831921	2456927.263	min		lc40513.png	ch40513.png	out40513.dat
5		2MASS 22485911+5421379	22 48 59.120 +54 21 37.99	EA	15.03	15.35	2.37077:	2456934.259	min		lc55093.png	ch55093.png	out55093.dat
6		2MASS 22490253+5315062	22 49 02.536 +53 15 06.21	EA	16.04	16.77	2.3795:	2456934.145	min		lc10853.png	ch10853.png	out10853.dat
7		2MASS 22490279+5345336	22 49 02.797 +53 45 33.61	EW	15	15.3	0.40529	2456928.087	min	Comm. 7	lc23315.png	ch23315.png	out23315.dat
8		2MASS 22490710+5330556	22 49 07.103 +53 30 55.66	EB	16.1	16.49	2.2387:	2456893.309	min		lc17416.png	ch17416.png	out17416.dat
9		2MASS 22490859+5325355	22 49 08.600 +53 25 35.54	EW	15.08	15.28	0.63468	2456892.253	min	Comm. 9	lc15069.png	ch15069.png	out15069.dat
10		2MASS 22490968+5356408	22 49 09.681 +53 56 40.86	EW	15.55	15.78	0.37778	2456929.136	min		lc28001.png	ch28001.png	out28001.dat
11		2MASS 22491471+5328085	22 49 14.715 +53 28 08.57	LB	12.87	13.05			other	Comm. 11	lc15391.png	ch15391.png	out15391.dat
12		2MASS 22491672+5442496	22 49 16.730 +54 42 49.68	LB	13.77	13.34			other	Comm. 12	lc46726.png	ch46726.png	out46726.dat
13		2MASS 22492261+5308355	22 49 22.610 +53 08 35.52	DSCT	15.69	15.83	0.15836	2456892.295	max	Comm. 13	lc08104.png	ch08104.png	out08104.dat
14		2MASS 22492581+5445020	22 49 25.814 +54 45 02.07	LB	14.42	14.54			other	Comm. 14	lc45569.png	ch45569.png	out45569.dat
15		2MASS 22494092+5419566	22 49 40.921 +54 19 56.66	LB	13.13	13.56			other	Comm. 15	lc55954.png	ch55954.png	out55954.dat
16		2MASS 22494380+5421295	22 49 43.805 +54 21 29.55	EA	15.14	15.6	0.87521	2456894.348	min		lc55167.png	ch55167.png	out55167.dat
17		2MASS 22500123+5447406	22 50 01.232 +54 47 40.65	LB	12.56	12.74			other	Comm. 17	lc44797.png	ch44797.png	out44797.dat
18		2MASS 22500557+5424273	22 50 05.571 +54 24 27.37	EW	16.42	17.24	0.97045	2456917.192	min		lc54221.png	ch54221.png	out54221.dat
19		2MASS 22501251+5415591	22 50 12.511 +54 15 59.18	L	14.32	14.69			other	Comm. 19	lc39266.png	ch39266.png	out39266.dat
20		2MASS 22501628+5501311	22 50 16.281 +55 01 31.14	BY	13.05	13.09	0.93198	2456928.198	max		lc34827.png	ch34827.png	out34827.dat
21		2MASS 22503120+5351341	22 50 31.209 +53 51 34.14	EA	13.7	13.81	1.8013:	2456894.289	min		lc25506.png	ch25506.png	out25506.dat
22		2MASS 22503213+5451020	22 50 32.140 +54 51 02.07	EA	14.05	14.52	4.60365:	2456928.041	min		lc43517.png	ch43517.png	out43517.dat
23		2MASS 22503320+5325490	22 50 33.201 +53 25 49.07	EW	15.03	15.42	0.82147	2456928.277	min	Comm. 23	lc14791.png	ch14791.png	out14791.dat
24		2MASS 22505128+5407477	22 50 51.282 +54 07 47.76	EA	13.75	13.93	1.0651	2456928.127	min		lc31633.png	ch31633.png	out31633.dat
25		2MASS 22510239+5400081	22 51 02.396 +54 00 08.19	EA	14.78	15.11	1.7491	2456928.332	min	Comm. 25	lc29067.png	ch29067.png	out29067.dat
26		2MASS 22510683+5326059	22 51 06.832 +53 26 05.94	SR:	12.65	12.74	43.9	2456933.2	max	Comm. 26	lc14746.png	ch14746.png	out14746.dat
27		2MASS 22511398+5426270	22 51 13.983 +54 26 27.07	EA	13.9	<14.44	2.0753:	2456927.129	min		lc53384.png	ch53384.png	out53384.dat
28		2MASS 22511431+5335287	22 51 14.318 +53 35 28.77	LB	14.17	16.29			other	Comm. 28	lc18645.png	ch18645.png	out18645.dat
29		2MASS 22511552+5455183	22 51 15.528 +54 55 18.39	LB	13.76	13.85			other	Comm. 29	lc37609.png	ch37609.png	out37609.dat
30		2MASS 22511969+5304303	22 51 19.696 +53 04 30.35	LB	11.93	12.14			other	Comm. 30	lc05840.png	ch05840.png	out05840.dat
31		2MASS 22513364+5456207	22 51 33.642 +54 56 20.74	EW	13.38	13.66	0.84019	2456928.335	min	Comm. 31	lc37254.png	ch37254.png	out37254.dat
32		2MASS 22514191+5405520	22 51 41.913 +54 05 52.08	LB	13.03	13.19			other	Comm. 32	lc31096.png	ch31096.png	out31096.dat
33		2MASS 22514326+5328205	22 51 43.269 +53 28 20.53	EA	15.81	16.9	0.74386	2456927.222	min	Comm. 33	lc15790.png	ch15790.png	out15790.dat
34		2MASS 22514494+5505441	22 51 44.949 +55 05 44.11	EA	15.08	<15.6	0.83307	2456927.717	min		lc33418.png	ch33418.png	out33418.dat
35		2MASS 22514555+5455417	22 51 45.558 +54 55 41.73	LB	13.39	13.59			other	Comm. 35	lc37536.png	ch37536.png	out37536.dat
36		2MASS 22515655+5303209	22 51 56.554 +53 03 20.95	DSCT	13.12	13.17	0.085427	2456928.241	max	Comm. 36	lc05358.png	ch05358.png	out05358.dat
37		2MASS 22515812+5426497	22 51 58.128 +54 26 49.77	DSCT	13.141	13.201	0.1908176	2456927.228	max	Comm. 37	lc53610.png	ch53610.png	out53610.dat
38		2MASS 22515854+5318505	22 51 58.540 +53 18 50.55	EA	14.85	15.03	0.727191	2456928.199	min		lc11656.png	ch11656.png	out11656.dat
39		2MASS 22522038+5335505	22 52 20.386 +53 35 50.59	EW	16.04	16.36	0.32626	2456928.272	min		lc18805.png	ch18805.png	out18805.dat
40		2MASS 22523182+5253496	22 52 31.824 +52 53 49.68	EA	15.24	15.55	1.4004	2456917.141	min		lc01612.png	ch01612.png	out01612.dat
41		2MASS 22523236+5329318	22 52 32.361 +53 29 31.85	EW	12.92	12.94	0.35313	2456894.207	min		lc15889.png	ch15889.png	out15889.dat
42		2MASS 22523396+5427303	22 52 33.964 +54 27 30.33	EA	13.82	13.96	1.22815	2456892.163	min	Comm. 42	lc53207.png	ch53207.png	out53207.dat
43		2MASS 22524069+5326228	22 52 40.690 +53 26 22.88	EW	16.3	16.71	0.26247	2456928.1	min		lc14721.png	ch14721.png	out14721.dat
44		2MASS 22524379+5355365	22 52 43.793 +53 55 36.51	EA	13.7	13.83	1.29230:	2456927.263	min		lc26282.png	ch26282.png	out26282.dat
45		2MASS 22524756+5431242	22 52 47.562 +54 31 24.21	RRAB:	14.67	14.76	0.77342	2456927.222	max		lc51885.png	ch51885.png	out51885.dat
46		2MASS 22530286+5453525	22 53 02.868 +54 53 52.52	LB	12.25	12.37			other	Comm. 46	lc42777.png	ch42777.png	out42777.dat
47		2MASS 22530429+5445300	22 53 04.299 +54 45 30.05	EA	15.09	15.33	1.03047	2456917.705	min		lc46299.png	ch46299.png	out46299.dat
48		2MASS 22530709+5435346	22 53 07.098 +54 35 34.66	LB	14.18	14.35			other	Comm. 48	lc50206.png	ch50206.png	out50206.dat
49		2MASS 22532119+5407369	22 53 21.194 +54 07 36.99	EW	15.58	15.85	0.30759	2456928.171	min		lc31794.png	ch31794.png	out31794.dat

Comments:

1. Min_II = 16^m.21.

2. Possible DSCT type with P = 0.08506 d and JD0 = 2456928.241.

3. J = 11^m.870, H = 11^m.199, K = 10^m.991 (2MASS).

7. Min_II = 15^m.26.

9. Min_II = 15^m.27.

11. J = 9^m.384, H = 8^m.392, K = 8^m.079 (2MASS).

12. J = 8^m.352, H = 7^m.613, K = 7^m.256 (2MASS).

13. EW type with twice longer period is possible (0.31671 d, JD0 = 2456934.179).

14. J = 12^m.425, H = 11^m.904, K = 11^m.762 (2MASS).

15. J = 8^m.256, H = 7^m.217, K = 6^m.809 (2MASS).
The object is in the NSVS database: ID 3468452.

17. J = 8^m.819, H = 7^m.774, K = 7^m.414 (2MASS).

19. J = 11^m.476, H = 11^m.770, K = 11^m.541 (2MASS).

23. Min_II = 15^m.36.

25. Min_II = 15^m.07.

26. J = 9^m.648, H = 8^m.659, K = 8^m.387 (2MASS).

28. J = 10^m.214, H = 8^m.472, K = 7^m.177 (2MASS).

29. J = 8^m.760, H = 7^m.695, K = 7^m.241 (2MASS).

30. J = 6^m.969, H = 5^m.924, K = 5^m.470 (2MASS).
The object is in the NSVS database: ID 3470780.

31. Min_II = 13^m.65.

32. J = 8^m.588, H = 7^m.616, K = 7^m.219 (2MASS).

33. Min_II = 16^m.03.

35. J = 9^m.788, H = 8^m.713, K = 8^m.385 (2MASS).

36. EW type with twice longer period (0.17079 d) is possible.

37. Twice longer period (0.572456 d) is possible.

42. Min_II = 13^m.90.

46. J = 8^m.812, H = 7^m.825, K = 7^m.439 (2MASS).

48. J = 10^m.510, H = 9^m.486, K = 9^m.074 (2MASS).

Remarks:
We present the second part of new discoveries of variable stars in Lacerta: area of 2°.3×2°.3, center α=22^h50^m δ=54°00′(2000.0). Some of the objects are newly discovered, some are already known from massive surveys like ZTF and ASAS-SN.

Our observations of an area in Lacerta were performed in 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.
We obtained all unfiltered CCD observations 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). We used VaST software (Sokolovsky & Lebedev 2018) to search for variable stars. To perform periodogram analysis, we applied WinEfk software provided by V.P. Goranskij.
This work was supported by Ministry of Education and Science of Russian Federation within the framework of state contract 3.6822.2017/7.8.

Acknowledgements: The authors are grateful to 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., Girard, T. M. et al., 2013, Astron. J., 145, 44, The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)