Journal "Peremennye Zvezdy"

"Peremennye Zvezdy",
Prilozhenie,
vol. 14, N 7 (2014)

New Variable Stars in Lacerta: Area of 2°.3×2°.3, Centered at α=22h50m, δ=50°00′ (2000.0). Part I

E. G. Lapukhin^#1, S. A. Veselkov^#1, A. M. Zubareva^#2,3, E. D. Starovoit^#1, I. V. Kolbasina^#1
#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

Received: 5.06.2013; accepted: 24.04.2014
(E-mail for contact: slovoktk@mail.ru)

#	Other	Coord (J2000)	Type	Max	Min	Period	Epoch (JD)	type	Comment	L.Curve	Find.Chart	Data
1	USNO-A2.0 1350-17188705	22 42 42.16, +50 11 11.2	EW	14.27	< 15	0.31981	2455833.401	Min		lc24723.png	ch_24723.png	out24723.txt
2	USNO-A2.0 1350-17196881	22 42 57.90, +50 04 59.0	EW	13.47	14.01	0.38601	2455831.237	Min		lc16487.png	ch_16487.png	out16487.txt
3	USNO-A2.0 1350-17197447	22 42 59.02, +50 04 24.7	ELL:	12.87	12.94	0.7984	2455802.468	Min		lc16322.png	ch_16322.png	out16322.txt
4	USNO-A2.0 1350-17199494	22 43 03.04, +50 26 33.4	EA	12.54	12.63:	1.08916	2455790.025	Min		lc31446.png	ch_31446.png	out31446.txt
5	USNO-A2.0 1350-17203448	22 43 10.61, +50 32 56.4	EW	15.96	16.35	0.4514	2455825.251	Min		lc29979.png	ch_29979.png	out29979.txt
6	USNO-A2.0 1350-17204990	22 43 13.60, +50 30 51.5	EA	14.81	15.19	3.526	2455796.39	Min		lc30446.png	ch_30446.png	out30446.txt
7	2MASS J22431499+5028244	22 43 14.999, +50 28 24.43	BY:	13.41	13.47	1.5733	2455789.883	Max	Comm. 7	lc30950.png	ch_30950.png	out30950.txt
8	USNO-A2.0 1350-17211981	22 43 27.04, +50 19 36.4	LB:	12.18	12.39			other	Comm. 8	lc22923.png	ch_22923.png	out22923.txt
9	USNO-A2.0 1350-17213786	22 43 30.48, +49 59 59.1	EW	15.35	15.48	0.35027	2455823.193	Min	Comm. 9	lc15312.png	ch_15312.png	out15312.txt
10	USNO-A2.0 1350-17214555	22 43 31.98, +49 38 29.5	EW	13.70	13.93	0.410807	2455819.243	Min		lc10366.png	ch_10366.png	out10366.txt
11	USNO-A2.0 1350-17214997	22 43 32.80, +49 26 01.1	EW	16.89	17.60	0.36329	2455824.067	Min		lc1111.png	ch_1111.png	out01111.txt
12	USNO-A2.0 1350-17215450	22 43 33.66, +49 03 49.2	EW	15.55	15.76	0.3836	2455821.401	Min	Comm. 12	lc02819.png	ch_02819.png	out02819.txt
13	USNO-A2.0 1350-17215928	22 43 34.62, +50 02 40.8	EW	16.40	16.78	0.27245	2455823.242	Min		lc15969.png	ch_15969.png	out15969.txt
14	USNO-A2.0 1350-17216219	22 43 35.15, +50 21 01.0	EW	16.26	17.00:	0.35523	2455825.084	Min		lc22745.png	ch_22745.png	out22745.txt
15	USNO-A2.0 1350-17224773	22 43 51.72, +50 15 16.5	EW	16.66	17.30	0.38427	2455824.090	Min		lc2113.png	ch_2113.png	out02113.txt
16	USNO-A2.0 1350-17224894	22 43 51.95, +49 04 05.4	LB:	13.30	13.40			other	Comm. 16	lc02652.png	ch_02652.png	out02652.txt
17	USNO-A2.0 1350-17229561	22 44 01.20, +49 03 02.8	EW	15.50	16.12	0.42546	2455834.040	Min	Comm. 17	lc02551.png	ch_02551.png	out02551.txt
18	USNO-A2.0 1350-17233266	22 44 08.36, +49 58 58.8	BY:	14.55	14.67	0.81681	2455829.336	Max		lc14939.png	ch_14939.png	out14939.txt
19	USNO-A2.0 1350-17237214	22 44 16.18, +49 21 35.0	EW	13.92	14.15	0.35319	2455823.123	Min		lc06496.png	ch_06496.png	out06496.txt
20	USNO-A2.0 1350-17240547	22 44 22.76, +50 39 18.2	EA	15.17	15.51	5.920	2455817.251	Min	Comm. 20	lc21559.png	ch_21559.png	out21559.txt
21	USNO-A2.0 1350-17241811	22 44 25.21, +50 45 34.6	EW	16.29	16.55	0.38370	2455823.238	Min		lc3132.png	ch_3132.png	out03132.txt
22	USNO-A2.0 1350-17243174	22 44 27.97, +49 45 08.2	EW	15.08	15.35	0.41399	2455823.177	Min		lc11702.png	ch_11702.png	out11702.txt
23	USNO-A2.0 1350-17244488	22 44 30.55, +48 51 35.8	EW	14.54	14.68	0.38771	2455820.147	Min		lc49347.png	ch_49347.png	out49347.txt
24	USNO-A2.0 1350-17244906	22 44 31.34, +49 08 02.5	EA	15.71	16.45	2.917	2455820.26	Min		lc03584.png	ch_03584.png	out03584.txt
25	USNO-A2.0 1350-17244918	22 44 31.38, +50 45 24.5	DSCTC	13.12	13.14	0.097798	2455790.308	Max		lc27479.png	ch_27479.png	out27479.txt
26	USNO-A2.0 1350-17245566	22 44 32.66, +49 43 55.6	EA	14.93	15.86	4.754	2455823.763	Min	Comm. 26	lc11440.png	ch_11440.png	out11440.txt
27	USNO-A2.0 1350-17245893	22 44 33.30, +50 06 59.9	EW	13.40	13.53	0.29450	2455790.228	Min		lc16748.png	ch_16748.png	out16748.txt
28	USNO-A2.0 1350-17247376	22 44 36.27, +49 33 07.2	EB	14.21	14.54:	5.308	2455829.76	Min		lc08702.png	ch_08702.png	out08702.txt
29	USNO-A2.0 1350-17248166	22 44 37.92, +50 04 34.4	BY:	13.58	13.61	0.46900	2455790.533	Max		lc16134.png	ch_16134.png	out16134.txt
30	USNO-A2.0 1350-17248275	22 44 38.12, +49 57 11.8	EW	16.07	16.39	0.3331	2455802.281	Min		lc14593.png	ch_14593.png	out14593.txt
31	USNO-A2.0 1350-17248400	22 44 38.38, +50 34 27.0	EA	13.92	14.58	2.637	2455790.014	Min		lc29770.png	ch_29770.png	out29770.txt
32	USNO-A2.0 1350-17250667	22 44 42.83, +49 03 09.8	BY	15.35	15.49	6.15	2455825.1	Max	Comm. 32	lc02484.png	ch_02484.png	out02484.txt
33	USNO-A2.0 1350-17252302	22 44 46.29, +48 57 18.5	EA	15.14	15.85	1.165	2455795.877	Min	Comm. 33	lc1121.png	ch_1121.png	out01121.txt
34	USNO-A2.0 1350-17257358	22 44 56.36, +50 12 13.9	EA	12.92	12.96	2.651:	2455790.945	Min		lc24752.png	ch_24752.png	out24752.txt
35	USNO-A2.0 1350-17258939	22 44 59.54, +49 49 45.2	LB:	11.79:	11.94:			other	Comm. 35	lc50226.png	ch_50226.png	out50226.txt
36	USNO-A2.0 1350-17259488	22 45 00.61, +49 37 43.5	BY:	15.20	15.33	1.344	2455821.419	Max		lc10061.png	ch_10061.png	out10061.txt
37	USNO-A2.0 1350-17259815	22 45 01.25, +49 56 57.5	LB:	12.82	12.99			other	Comm. 37	lc14329.png	ch_14329.png	out14329.txt
38	USNO-A2.0 1350-17260048	22 45 01.71, +50 22 17.3	EW	17.09	17.90	0.33241	2455825.206	Min		lc3113.png	ch_3113.png	out03113.txt
39	USNO-A2.0 1350-17262414	22 45 06.40, +48 55 59.3	EW	14.66	14.88	0.4816	2455819.206	Min		lc00838.png	ch_00838.png	out00838.txt
40	USNO-A2.0 1350-17262597	22 45 06.75, +50 53 14.8	LB:	13.09	13.36			other	Comm. 40	lc42398.png	ch_42398.png	out42398.txt
41	USNO-A2.0 1350-17263064	22 45 07.59, +49 37 58.9	DSCTC	13.28	13.30	0.047526	2455790.286	Max		lc10018.png	ch_10018.png	out10018.txt
42	USNO-A2.0 1350-17264794	22 45 11.03, +49 06 43.8	EW	16.26	16.63	0.33091	2455819.250	Min		lc44098.png	ch_44098.png	out44098.txt
43	2MASS J22451517+4904573	22 45 15.173, +49 04 57.33	EW	13.03	13.10	0.40138	2455800.103	Min	Comm. 43	lc02577.png	ch_02577.png	out02577.txt
44	USNO-A2.0 1350-17271530	22 45 24.04, +49 44 29.8	EA	14.16	14.58	0.75661	2455800.443	Min		lc43673.png	ch_43673.png	out43673.txt
45	USNO-A2.0 1350-17271622	22 45 24.23, +49 35 30.7	EW	13.79	13.84	0.35401	2455790.408	Min	Comm. 45	lc09431.png	ch_09431.png	out09431.txt
46	USNO-A2.0 1350-17272895	22 45 26.72, +50 37 51.8	EW	15.04	15.32	0.29994	2455825.075	Min		lc29135.png	ch_29135.png	out29135.txt
47	USNO-A2.0 1350-17274441	22 45 29.64, +50 45 27.6	EA	17.03	17.91	0.24862	2455819.371	Min		lc3121.png	ch_3121.png	out03121.txt
48	USNO-A2.0 1350-17274829	22 45 30.43, +49 18 20.0	EW	16.16	16.44	0.36348	2455821.482	Min		lc05677.png	ch_05677.png	out05677.txt
49	USNO-A2.0 1350-17275322	22 45 31.38, +49 07 57.8	DSCT:	16.52	16.77	0.17934	2455823.215	Max		lc45322.png	ch_45322.png	out45322.txt
50	USNO-A2.0 1350-17276142	22 45 33.00, +49 35 27.3	EW	13.40	13.79	0.64007	2455831.999	Min	Comm. 50	lc09326.png	ch_09326.png	out09326.txt
51	2MASS J22453398+4906590	22 45 33.983, +49 06 59.07	EW	14.02	14.09	0.34845	2455822.504	Min	Comm. 51	lc03167.png	ch_03167.png	out03167.txt
52	USNO-A2.0 1350-17281771	22 45 44.28, +49 04 14.0	LB:	13.61	13.76			other	Comm. 52	lc1131.png	ch_1131.png	out01131.txt
53	2MASS J22454859+4916322	22 45 48.596, +49 16 32.29	EW	13.71	13.79	0.6259	2455833.419	Min	Comm. 53	lc05196.png	ch_05196.png	out05196.txt
54	USNO-A2.0 1350-17287839	22 45 56.45, +50 53 16.3	BY:	12.33	12.45	15	2455824.2	Max		lc25850.png	ch_25850.png	out25850.txt
55	USNO-A2.0 1350-17289062	22 45 58.86, +49 52 44.3	EW	15.32	15.50	0.35925	2455823.367	Min		lc13336.png	ch_13336.png	out13336.txt
56	USNO-A2.0 1350-17294911	22 46 10.83, +50 43 45.4	EW	16.47	16.67	0.37158	2455823.267	Min		lc3114.png	ch_3114.png	out03114.txt
57	USNO-A2.0 1350-17296584	22 46 14.36, +50 48 28.9	EW	15.95	16.63	0.29723	2455820.246	Min		lc3123.png	ch_3123.png	out03123.txt
58	USNO-A2.0 1350-17303918	22 46 29.36, +48 59 55.3	LB:	12.43	12.65			other	Comm. 58	lc1141.png	ch_1141.png	out01141.txt
59	USNO-A2.0 1350-17305872	22 46 33.39, +49 10 00.3	EA/RS	13.56	13.63	5.17:	2455822.928	Min		lc03718.png	ch_03718.png	out03718.txt
60	USNO-A2.0 1350-17307384	22 46 36.42, +49 53 55.9	EW	16.93	17.41	0.2668	2455822.489	Min		lc2116.png	ch_2116.png	out02116.txt
61	USNO-A2.0 1350-17309600	22 46 41.09, +50 12 49.6	BY:	13.42	13.47	18.5	2455824.0	Max		lc17760.png	ch_17760.png	out17760.txt
62	USNO-A2.0 1350-17309889	22 46 41.65, +50 46 48.8	EA	13.83	14.06	1.371:	2455820.263	Min	Comm. 62	lc27325.png	ch_27325.png	out27325.txt

Comments:

7. Combined brightness of two close stars, 2MASS J22431530+5028249 (J = 13.413, H = 13.470, K = 13.470) and 2MASS J22431499+5028244 (J = 13.907, H = 13.582, K = 13.487), was measured. The second one probably varies.

8. J = 8.182, H = 7.206, K = 6.851 (2MASS).

9. Combined brightness of two close stars, 2MASS J22433052+5000002 (J = 14.922, H = 14.580, K = 14.514) and 2MASS J22433029+4959576 (J = 14.906, H = 14.551, K = 14.323), was measured.

12. P = 0^d.19176 is also possible with DSCT type.

16. J = 10.550, H = 9.639, K = 9.390 (2MASS).

17. Min_II = 15^m.88.

20. Twice shorter period is also possible.

26. O'Connell effect.

32. J = 13.408, H = 12.793, K = 12.616 (2MASS).

33. O'Connell effect.

35. J = 9.655, H = 9.081, K = 8.900 (2MASS).

37. J = 9.613, H = 8.622, K = 8.358 (2MASS).

40. J = 9.189, H = 8.198, K = 7.897 (2MASS).

43. Combined brightness of two close stars, 2MASS J22451536+4904507 (J = 11.902, H = 11.554, K = 11.459) and 2MASS J22451517+4904573 (J = 13.525, H = 13.325, K = 13.276), was measured. The first one probably varies.

45. Combined brightness of two close stars, 2MASS J22452406+4935318 (J = 13.393, H = 13.038, K = 13.028) and 2MASS J22451517+4904573 (J = 13.525, H = 13.325, K = 13.276), was measured.

50. Min_II = 13^m.74.

51. Min_II = 14^m.07.
Combined brightness of two close stars, 2MASS J22453398+4906590 (J = 14.300, H = 13.834, K = 13.785) and 2MASS J22453405+4907033 (J = 13.100, H = 12.910, K = 12.819), was measured. The first one probably varies.

52. J = 10.539, H = 9.570, K = 9.166 (2MASS).

53. Min_II = 13^m.77.
Combined brightness of two close stars, 2MASS J22454829+4916265 (J = 12.929, H = 12.761, K = 12.716) and 2MASS J22454858+4916322 (J = 14.979, H = 14.552, K = 14.433), was measured. The second one probably varies.

58. J = 9.417, H = 8.478, K = 8.213 (2MASS).

62. Only one minimum was observed.

Remarks:
On August 16 – October 30, 2011, we obtained about 1600 images with 30-second exposures of a field in Lacerta for discovery and investigation of new variables stars.
The field center has the coordinates α = 22^h50^m, δ = +50°00′, and the size of our frames is 2°.3 × 2°.3. In this paper, we present the first part of our results.
Our observations were performed in the city of Krasnoyarsk with a Hamilton telescope (D = 400 mm, F = 915 mm) equipped with an unfiltered FLI ML-9000 CCD camera (3056 × 3056 pixels, pixel size 12 μm).
For basic reductions for dark current, flat fields, bias, and for removing cosmic-ray hits, we used MaxImDL software.
The magnitudes were referred to red magnitudes of comparison stars from the USNO-A2.0 catalog (Monet et al. 1998).
For search and photometry of the majority of the new variable stars, we applied VaST software (developed by K. Sokolovsky and A. Lebedev, described by Kolesnikova et al. 2008). Several variable stars were found with the C-Munipack package.
To search for periods, we applied WinEfk software provided by Dr. V.P. Goranskij.

Acknowledgements: The authors wish to thank Dr. V.P. Goranskij for providing his efficient period-search software, Dr. K. Sokolovsky and A. Lebedev for their fine VaST software.

References:
Monet, D., Bird, A., Canzian, B., et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards (U.S. Naval Observatory, Washington, DC), Centre de Données Astronomiques de Strasbourg, I/252
Kolesnikova, D.M., Sat, L.A., Sokolovsky, K.V., et al., 2008, Acta Astron., 58, 279