Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 11, N 16 (2011)

New Variable Stars in the Field of V651 Oph

T. Kryachko#1, A. Samokhvalov#2, B. Satovskiy#1
#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia

Received:   4.03.2011;   accepted:   22.04.2011
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 0975-1236197718 36 57.47, +09 34 17.6EW13.9014.31 0.441522455450.3047Min Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 0975-1236847818 37 03.55, +09 42 26.3RRAB16.3017.34 0.513112455358.8692Max  02_PC-R.png02_chart.jpg02_data.txt
3 2MASS 18370480+091447218 37 04.81, +09 14 47.3EW16.6217.15 0.278542455358.5714Min Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 2MASS 18370524+093038218 37 05.24, +09 30 38.3EW15.2015.46 0.435062455438.5643Min Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 2MASS 18371322+094513118 37 13.22, +09 45 13.2EW16.2216.45 0.300052455438.315Min Comm. 505_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 0975-1238087018 37 14.71, +10 02 54.2EW16.7017.10 0.448202455358.5154Min Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 0975-1239154118 37 23.95, +09 16 09.5EW16.0616.34 0.36312455358.7060Min Comm. 707_PC-R.png07_chart.jpg07_data.txt
8 USNO-A2.0 0975-1239273718 37 24.99, +09 29 06.0EB17.3517.82 0.52242455358.8680Min Comm. 808_PC-R.png08_chart.jpg08_data.txt
9 USNO-A2.0 0975-1239320418 37 25.40, +09 18 05.2EA15.5415.76 0.81912455358.8360Min Comm. 909_PC-R.png09_chart.jpg09_data.txt
10 USNO-A2.0 0975-1239619518 37 28.10, +09 44 16.7EW18.4719.27 0.365992455358.4701Min Comm. 1010_PC-R.png10_chart.jpg10_data.txt
11 USNO-A2.0 0975-1240626318 37 37.10, +09 59 21.2EW16.5117.03 0.415862455496.1676Min Comm. 1111_PC-R.png11_chart.jpg11_data.txt
12 USNO-A2.0 0975-1241221218 37 42.31, +10 00 13.3EW15.5415.91 0.421392455439.3367Min Comm. 1212_PC-R.png12_chart.jpg12_data.txt
13 USNO-A2.0 0975-1241475718 37 44.52, +09 55 59.1EB15.0115.23 1.11912455358.7908Min Comm. 1313_PC-R.png13_chart.jpg13_data.txt
14 USNO-A2.0 0975-1241809318 37 47.44, +09 34 30.4EW13.8314.12 0.54912455358.4261Min Comm. 1414_PC-R.png14_chart.jpg14_data.txt
15 USNO-A2.0 0975-1242425018 37 52.83, +09 13 06.8SR:13.8613.97 23.42455370.1Max Comm. 1515_PC-R.png15_chart.jpg15_data.txt
16 USNO-A2.0 0975-1242591318 37 54.25, +09 22 36.2SR:16.3816.61 65.6:2455382.0Max Comm. 1616_PC-R.png16_chart.jpg16_data.txt
17 USNO-A2.0 0975-1244681018 38 13.08, +09 49 08.4EW14.3814.49 0.486832455495.1669Min Comm. 1717_PC-R.png17_chart.jpg17_data.txt
18 USNO-A2.0 0975-1245016918 38 16.13, +09 31 13.0EW13.8514.18 0.588262455358.5618Min  18_PC-R.png18_chart.jpg18_data.txt
19 USNO-A2.0 0975-1245449418 38 20.04, +09 23 51.3SXPHE14.1214.23 0.167812455358.6490Max Comm. 1919_PC-R.png19_chart.jpg19_data.txt
20 USNO-A2.0 0975-1246679618 38 30.67, +09 42 04.4EW17.0517.35 0.314752455358.6435Min Comm. 2020_PC-R.png20_chart.jpg20_data.txt
21 2MASS 18383967+093156118 38 39.67, +09 31 56.1EB13.9214.35 0.611632455358.4792Min Comm. 2121_PC-R.png21_chart.jpg21_data.txt
22 2MASS 18384578+094154318 38 45.79, +09 41 54.4EW16.1416.56 0.342902455439.321Min Comm. 2222_PC-R.png22_chart.jpg22_data.txt
23 USNO-A2.0 0975-1249426518 38 54.63, +10 03 37.0EW16.4216.67 0.356382455496.1764Min Comm. 2323_PC-R.png23_chart.jpg23_data.txt
24 USNO-A2.0 0975-1249734818 38 57.19, +09 13 27.2RRAB15.2816.14 0.725082455359.6493Max  24_PC-R.png24_chart.jpg24_data.txt
25 USNO-A2.0 0975-1249815418 38 57.98, +10 02 48.4EW13.5413.63 0.373332455440.3650Min Comm. 2525_PC-R.png25_chart.jpg25_data.txt
26 USNO-A2.0 0975-1249898518 38 58.69, +09 24 17.5RRAB16.4317.43 0.526962455360.627Max  26_PC-R.png26_chart.jpg26_data.txt
27 USNO-A2.0 0975-1250076918 39 00.23, +09 57 32.5EW16.5416.92 0.368042455358.7175Min Comm. 2727_PC-R.png27_chart.jpg27_data.txt
28 USNO-A2.0 0975-1250748518 39 05.85, +09 34 30.3EW17.7818.34 0.369962455358.4812Min Comm. 2828_PC-R.png28_chart.jpg28_data.txt
29 USNO-A2.0 0975-1251621618 39 13.63, +09 45 07.5EB15.9916.47 0.57042455358.4390Min Comm. 2929_PC-R.png29_chart.jpg29_data.txt
30 USNO-A2.0 0975-1251836118 39 15.57, +09 46 49.0EW15.2415.78: 0.397752455358.4672Min  30_PC-R.png30_chart.jpg30_data.txt
31 2MASS 18391835+095628218 39 18.36, +09 56 28.2EB15.6915.87 0.563652455358.8273Min Comm. 3131_PC-R.png31_chart.jpg31_data.txt
32 USNO-A2.0 0975-1252392918 39 20.59, +09 44 01.2BY:15.2215.34 5.332455362.9718Max Comm. 3232_PC-R.png32_chart.jpg32_data.txt
33 USNO-A2.0 0975-1253467818 39 30.90, +10 03 50.3EB15.6016.08 0.514092455358.8265Min Comm. 3333_PC-R.png33_chart.jpg33_data.txt
34 2MASS 18393235+093303118 39 32.36, +09 33 03.2RRAB17.3018.48 0.613532455495.1908Max Comm. 3434_PC-R.png34_chart.jpg34_data.txt
35 USNO-A2.0 0975-1254189418 39 38.07, +10 02 09.2SXPHE15.5915.79 0.1165312455438.3228Max Comm. 3535_PC-R.png35_chart.jpg35_data.txt
36 USNO-A2.0 0975-1254469518 39 40.65, +09 48 18.3RRC14.3614.77 0.328652455358.5947Max  36_PC-R.png36_chart.jpg36_data.txt
37 USNO-A2.0 0975-1254929118 39 44.95, +09 54 19.9EW15.0515.35 0.271502455358.7514Min Comm. 3737_PC-R.png37_chart.jpg37_data.txt
38 USNO-A2.0 0975-1254945618 39 45.03, +09 51 24.0EW18.2919.33 0.258942455358.5663Min Comm. 3838_PC-R.png38_chart.jpg38_data.txt
39 2MASS 18394918+100315418 39 49.19, +10 03 15.4EW16.7817.05 0.463542455358.6147Min Comm. 3939_PC-R.png39_chart.jpg39_data.txt
40 2MASS 18395488+091338618 39 54.88, +09 13 38.6SXPHE13.4013.59 0.1153252455439.3290Max Comm. 4040_PC-R.png40_chart.jpg40_data.txt
41 USNO-A2.0 0975-1256170218 39 56.66, +09 22 13.6EW14.9115.28 0.325532455439.3525Min Comm. 4141_PC-R.png41_chart.jpg41_data.txt
42 USNO-A2.0 0975-1257381318 40 07.86, +09 36 58.0EW16.2616.52 0.290852455439.3205Min Comm. 4242_PC-R.png42_chart.jpg42_data.txt
43 USNO-A2.0 0975-1257652218 40 10.24, +09 59 45.1EB15.9816.37 0.509962455358.5865Min Comm. 4343_PC-R.png43_chart.jpg43_data.txt
44 2MASS 18401586+091946618 40 15.86, +09 19 46.6EW15.4115.75 0.354512455439.3408Min Comm. 4444_PC-R.png44_chart.jpg44_data.txt
45 USNO-A2.0 0975-1259065418 40 23.22, +10 02 46.1HADS14.8115.47 0.0741422455439.3188Max Comm. 4545_PC-R.png45_chart.jpg45_data.txt
46 USNO-A2.0 0975-1259881018 40 30.79, +09 12 39.4EW16.9517.31 0.376882455358.7080Min Comm. 4646_PC-R.png46_chart.jpg46_data.txt

Comments:


1. Primary minimum: HJD(TT) 2455450.3047 ± 0.0001. MinII = 14m.29.

3. A close pair of stars: 2MASS 18370480+0914472 and 2MASS 18370454+0914489; 2MASS 18370480+0914472 varies. MinII = 17m.15.

4. A close pair of stars: 2MASS 18370536+0930434 and 2MASS 18370524+0930382; 2MASS 18370524+0930382 varies. Type RRC and period 0d.21753 are also possible. MinII = 15m.46.

5. A close pair of stars: 2MASS 18371343+0945095 and 2MASS 18371322+0945131; 2MASS 18371322+0945131 varies. Primary minimum: HJD(TT) 2455438.315 ± 0.001. MinII = 16m.41.

6. MinII is fainter than 17m.03.

7. MinII = 16m.34:.

8. MinII = 17m.54.

9. A close triplet of stars: USNO-A2.0 0975-12393204 and two faint stars, not present in any catalogues separately; USNO-A2.0 0975-12393204 varies. MinII = 15m.74.

10. MinII = 19m.09:.

11. Primary minimum: HJD(TT) 2455496.1676 ± 0.0008. MinII = 16m.98.

12. O'Connell effect. Primary minima:
HJD(TT)±
2455439.33670.0005
2455450.29280.0007
MinII = 15m.90.

13. MinII = 15m.09.

14. A close pair of stars with equal brightness not found in any catalogues separately. The light curve shape varies, presumably because of spot activity. Type RRC and period 0d.2746 are also possible. MinII = 14m.09.

15. Infrared colors J–H = 0.960, H–K = 0.269 and J–K = 1.229 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

16. Infrared colors J–H = 0.990, H–K = 0.315 and J–K = 1.305 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

17. Primary minimum: HJD(TT) 2455495.1669 ± 0.0004. MinII = 14m.49.

19. A close pair of stars with equal brightness not found in any catalogues separately.

20. MinII = 17m.35.

21. MinII = 14m.14.

22. Primary minimum: HJD(TT) 2455439.321 ± 0.001. MinII = 16m.41.

23. Primary minimum: HJD(TT) 2455496.1764 ± 0.0006. MinII = 16m.63.

25. O'Connell effect. Primary minimum: HJD(TT) 2455440.3649 ± 0.0008. MinII = 13m.62.

27. A close triplet of stars: USNO-A2.0 0975-12500769, 2MASS 18390008+0957365 and a faint star, not found in any catalogues. MinII = 16m.80.

28. MinII = 18m.27.

29. O'Connell effect. MinII = 16m.23.

31. A close pair of stars: 2MASS 18391835+0956282 and 2MASS 18391860+0956266; 2MASS 18391835+0956282 varies.

32. Infrared colors J–H = 0.627, H–K = 0.262 and J–K = 0.889 (2MASS) are consistent with the K spectral type (Bessell and Brett 1988) and BY: classification.

33. MinII is fainter than 16m.01.

34. Maxima:
HJD(TT)±
2455439.356 0.001
2455495.19080.0002


35. Maxima:
HJD(TT)±
2455438.32280.0006
2455495.18860.0006


37. A close pair of stars with equal brightness not found in any catalogues separately. MinII = 15m.28.

38. MinII = 19m.05.

39. A close pair of stars: 2MASS 18394906+1003199 and 2MASS 18394918+1003154; 2MASS 18394918+1003154 varies. MinII = 17m.00:.

40. A close pair of stars: 2MASS 18395488+0913386 and 2MASS 18395504+0913431; 2MASS 18395488+0913386 varies.

41. A close pair of stars: USNO-A2.0-0975-12561702 and a faint star, not found in any catalogues. Primary minimum: HJD(TT) 2455439.3525 ± 0.0006. MinII = 15m.27.

42. O'Connell effect. Primary minimum: HJD(TT) 2455439.317 ± 0.001. MinII = 16m.51.

43. O'Connell effect. MinII = 16m.20.

44. A close pair of stars: 2MASS-18401586+0919466 and 2MASS 18401591+0919409; 2MASS 18401586+0919466 varies. Primary minimum: HJD(TT) 2455439.3408 ± 0.0008. MinII = 15m.70.

45. Maxima:
HJD(TT)±
2455439.31880.0008
2455450.29290.0006


46. MinII = 17m.28.

Remarks:
During observations of the field of variable star V651 Oph, we discovered 46 new variable stars. Our observations were carried out at the Astrotel-Caucasus observatory using the 300-mm Ritchey-Chretien telescope, equipped with an unfiltered Apogee Alta U9000 CCD camera. A total of 191 images with 5-minute exposures were obtained on JD 2455360–2455496. For basic reductions for dark current, flat fields, bias, and for removing cosmic rays hits we used IRAF routines. For search and photometry of new variable stars, we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star was USNO-A2.0 0975-12485272 = USNO-B1.0 0995-0376789 (α=18h38m46s.81, δ=+09°34′ 38″.8, J2000; 2MASS), R1 = 14m.26, R2 = 13m.74 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 14m.00. The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Skrutskie et al. 2006). For search for periods and epochs of extrema, we use Peranso software.

Acknowledgements: We would like to thank S.V. Antipin and N.N. Samus for helpful discussion.

References:
Bessell, M.S., Brett, J.M., 1988, PASP, 100, 1134
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, AJ, 131, 1163
Sokolovsky, K., Lebedev, A., 2005, in 12th Young Scientists' Conference on Astronomy and Space Physics, Kyiv, Ukraine, April 19–23, 2005, eds.: Simon, A.; Golovin, A., p.79



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