Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 13, N 10 (2013)

New Variable Stars at the Borderline of Ophiuchus and Serpens

V. Solovyov#1, A. Samokhvalov#2, T. Kryachko#3, B. Satovskiy#3
#1. Kazan Federal University, Kazan, Russia;
#2. Surgut, Russia;
#3. Astrotel Observatory, Karachay-Cherkessia, Russia

Received:   24.03.2013;   accepted:   14.06.2013
(E-mail for contact: solo.vya@gmail.com, sav@surgut.ru, bredfild@mail.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 0900-1292799718 28 30.02, +02 51 56.1RRAB16.5317.76*0.408782455769.437Max Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 0900-1293259018 28 35.74, +02 59 26.9SR:14.8815.10*23.82456186.7Max Comm. 202_PC-R.png02_chart.jpg02_data.txt
3 USNO-A2.0 0900-1293384018 28 37.30, +03 18 04.9RRC15.6116.00*0.322602456200.2274Max Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 USNO-A2.0 0900-1294184618 28 47.46, +03 05 25.9EW15.8216.28*0.3851822455344.3523Min Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 USNO-A2.0 0900-1294708218 28 53.80, +02 48 48.5SR:13.6013.77*28.32455038.2Max Comm. 505_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 0900-1294737118 28 54.23, +03 31 05.5LB13.2914.40*  other Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 0900-1295248118 29 00.80, +03 12 52.5SR:14.5814.86*412456199.5Max Comm. 707_PC-R.png07_chart.jpg07_data.txt
8 2MASS 18290128+031958718 29 01.29, +03 19 58.8EA16.0517.80*2.198482455019.269Min  08_PC-R.png08_chart.jpg08_data.txt
9 2MASS 18290864+025416218 29 08.65, +02 54 16.3EA14.9015.19*1.96192455038.521Min Comm. 909_PC-R.png09_chart.jpg09_data.txt
10 USNO-A2.0 0900-1296186018 29 12.73, +03 13 40.8SR:13.7614.78*101:2455803Max Comm. 1010_PC-R.png10_chart.jpg10_data.txt
11 USNO-A2.0 0900-1296180818 29 12.73, +03 37 07.4SR:13.6013.88*30.62455773Max Comm. 1111_PC-R.png11_chart.jpg11_data.txt
12 USNO-A2.0 0900-1296206118 29 13.04, +03 05 01.9EW13.7913.97*0.3064292455344.3580Min Comm. 1212_PC-R.png12_chart.jpg12_data.txt
13 USNO-A2.0 0900-1296505418 29 16.68, +03 26 55.8SR:13.7214.12*48.72455773Max Comm. 1313_PC-R.png13_chart.jpg13_data.txt
14 USNO-A2.0 0900-1296624718 29 18.06, +03 40 56.5LB14.1914.63*  other Comm. 1414_PC-R.png14_chart.jpg14_data.txt
15 USNO-A2.0 0900-1297681618 29 30.66, +03 24 29.7SR:14.2815.12*1132455778Max Comm. 1515_PC-R.png15_chart.jpg15_data.txt
16 USNO-A2.0 0900-1297775518 29 31.82, +03 28 53.1SR:15.8016.44*41.7:2456242Max Comm. 1616_PC-R.png16_chart.jpg16_data.txt
17 USNO-A2.0 0900-1297920918 29 33.67, +03 30 49.1SR:12.7712.87*37.42456203Max Comm. 1717_PC-R.png17_chart.jpg17_data.txt
18 USNO-A2.0 0900-1298207218 29 37.32, +03 27 52.0SR:14.4915.45*124:2455757Max Comm. 1818_PC-R.png18_chart.jpg18_data.txt
19 2MASS 18293993+025154818 29 39.94, +02 51 54.8SR:13.4614.51*74:2455741Max Comm. 1919_PC-R.png19_chart.jpg19_data.txt
20 USNO-A2.0 0900-1298492618 29 40.89, +03 24 34.6RRAB15.0816.06*0.5642452455772.4814Max Comm. 2020_PC-R.png20_chart.jpg20_data.txt
21 USNO-A2.0 0900-1300433518 30 06.19, +03 27 22.5SR:13.8013.94*18.372455023Max Comm. 2121_PC-R.png21_chart.jpg21_data.txt
22 USNO-A2.0 0900-1300681418 30 09.56, +03 25 45.2SR:14.6914.84*18.92455770Max Comm. 2222_PC-R.png22_chart.jpg22_data.txt
23 USNO-A2.0 0900-1301003618 30 13.95, +03 10 49.7SR:14.2414.44*22.282455734.6Max Comm. 2323_PC-R.png23_chart.jpg23_data.txt
24 USNO-A2.0 0900-1301215718 30 16.85, +03 12 10.7SR:14.0814.30*20.6:2456219Max Comm. 2424_PC-R.png24_chart.jpg24_data.txt
25 USNO-A2.0 0900-1301848918 30 25.63, +03 40 56.4LB14.6715.85*  other Comm. 2525_PC-R.png25_chart.jpg25_data.txt
26 USNO-A2.0 0900-1301938318 30 26.79, +02 50 17.1SR:12.6412.82*20.382456185Max Comm. 2626_PC-R.png26_chart.jpg26_data.txt
27 USNO-A2.0 0900-1302213818 30 30.37, +03 31 47.8SR:15.2615.82*100:2455100Max Comm. 2727_PC-R.png27_chart.jpg27_data.txt
28 USNO-A2.0 0900-1303300018 30 45.07, +03 37 50.1SR:15.0315.48*42.6:2455048Max Comm. 2828_PC-R.png28_chart.jpg28_data.txt
29 USNO-A2.0 0900-1303389018 30 46.40, +03 14 57.3RRAB14.8316.24*0.4397172456173.3065Max Comm. 2929_PC-R.png29_chart.jpg29_data.txt
30 USNO-A2.0 0900-1303497118 30 47.83, +03 41 00.9M14.8518.50*2312455134Max Comm. 3030_PC-R.png30_chart.jpg30_data.txt
31 USNO-A2.0 0900-1304762918 31 05.70, +03 09 43.2BY:14.6914.83*6.25502455023.19Max Comm. 3131_PC-R.png31_chart.jpg31_data.txt
32 USNO-A2.0 0900-1305980718 31 24.24, +02 52 58.5SR:14.1114.38*21.82456193.4Max Comm. 3232_PC-R.png32_chart.jpg32_data.txt
33 USNO-A2.0 0900-1306362618 31 30.44, +03 12 55.6SR:14.7515.37*42.8:2456178.9Max Comm. 3333_PC-R.png33_chart.jpg33_data.txt
34 USNO-A2.0 0900-1307188418 31 42.91, +02 59 58.0SR:12.8713.20*38.7:2456207.Max Comm. 3434_PC-R.png34_chart.jpg34_data.txt
35 USNO-A2.0 0900-1307648618 31 49.92, +03 22 46.1SR:13.1713.70*1812455109Max Comm. 3535_PC-R.png35_chart.jpg35_data.txt
36 USNO-A2.0 0900-1307701718 31 50.72, +03 32 45.8EB14.3214.63*0.6542992456174.3115Min Comm. 3636_PC-R.png36_chart.jpg36_data.txt
37 USNO-A2.0 0900-1307960618 31 54.63, +03 28 50.3SR:15.3416.16*69.6:2455071Max Comm. 3737_PC-R.png37_chart.jpg37_data.txt

Comments:


1. Maxima:
HJD(TT)±
2455769.437 0.003
2456047.424 0.005
2456049.468 0.003
2456189.26510.0008


2. A close pair of two stars: USNO-A2.0 0900-12932590 and 2MASS 18283560+0259315. USNO-A2.0 0900-12932590 varies. Infrared colors J–H = 1.044, H–K = 0.344 and J–K = 1.388 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maximum: HJD(TT) 2456186.7±0.5.

3. A close triplet of stars USNO-A2.0 0900-12933840, 2MASS 18283742+0318015, and a faint star not contained in any catalogues. USNO-A2.0 0900-12933840 varies.
Maximum: HJD(TT) 2456200.2274±0.0009.

4. Primary minima:
HJD(TT)±
2455344.35230.0007
2456173.26610.0008
2456183.27700.0004
2456200.22750.0009
MinII = 16m.26.

5. Infrared colors J–H = 0.973, H–K = 0.340 and J–K = 1.313 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

6. Infrared source IRAS 18264+0329. Infrared colors J–H = 1.102, H–K = 0.400 and J–K = 1.502 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and LB classification.

7. Infrared colors J–H = 1.002, H–K = 0.345 and J–K = 1.347 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
2455747.0 0.9
2456199.5 0.6


9. Period 0d.9810 is also possible.

10. Infrared colors J–H = 1.026, H–K = 0.503 and J–K = 1.529 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
2455803 1
2456208 1


11. A close pair of two stars: USNO-A2.0 0900-12961808 and a faint star, not contained in any catalogues. USNO-A2.0 0900-12961808 varies. Infrared colors J–H = 1.036, H–K = 0.374 and J–K = 1.410 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

12. Primary minima:
HJD(TT)±
2455344.35800.0004
2455772.44320.0007
2455785.30630.0002
2455815.33730.0008
2456049.45150.0010
2456052.511 0.001
2456173.24690.0002
MinII = 13m.95.

13. Infrared colors J–H = 1.021, H–K = 0.333 and J–K = 1.354 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maximum: HJD(TT) 2455773±1.

14. Infrared colors J–H = 1.079, H–K = 0.488 and J–K = 1.567 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and LB classification.

15. Infrared colors J–H = 1.071, H–K = 0.431 and J–K = 1.502 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maximum: HJD(TT) 2455778.0±1.5.

16. Infrared colors J–H = 1.094, H–K = 0.383 and J–K = 1.477 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

17. Infrared colors J–H = 0.848, H–K = 0.305 and J–K = 1.153 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maximum: HJD(TT) 2456203±2.

18. Infrared colors J–H = 1.043, H–K = 0.501 and J–K = 1.544 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maximum: HJD(TT) 2455757±1.

19. Infrared colors J–H = 0.933, H–K = 0.337 and J–K = 1.270 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
24557412
24561881


20. Maxima:
HJD(TT)±
2455772.48140.0008
2455784.33590.0009
2456183.258 0.002
2456218.24140.0005


21. A close pair of two stars: USNO-A2.0 0900-13004335 and a faint star, not contained in any catalogues. USNO-A2.0 0900-13004335 varies. Infrared colors J–H = 1.000, H–K = 0.385 and J–K = 1.385 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

22. Infrared colors J–H = 1.066, H–K = 0.281 and J–K = 1.347 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

23. Infrared colors J–H = 1.037, H–K = 0.440 and J–K = 1.477 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
2455734.60.5
2456180.80.7


24. A close pair of two stars: USNO-A2.0 0900-13012157 and a faint star, not contained in any catalogues. USNO-A2.0 0900-13012157 varies. Infrared colors J–H = 1.080, H–K = 0.296 and J–K = 1.376 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

25. Infrared colors J–H = 1.131, H–K = 0.455 and J–K = 1.586 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and LB classification.

26. A close triplet of stars USNO-A2.0 0900-13019383 and two faint stars, not contained in any catalogues. USNO-A2.0 0900-13019383 varies. Infrared colors J–H = 1.101, H–K = 0.429 and J–K = 1.530 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
24557361
24561851


27. A close triplet of stars USNO-A2.0 0900-13022138, NOMAD1 0935-0383912 and NOMAD1 0935-0383907. USNO-A2.0 0900-13022138 varies. Infrared colors J–H = 1.160, H–K = 0.462 and J–K = 1.622 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

28. Infrared colors J–H = 1.103, H–K = 0.382 and J–K = 1.485 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

29. Blazhko effect with a period of 53d.4.
Maxima:
HJD(TT)±
2455344.41660.0006
2455432.366 0.001
2456173.30650.0004
2456195.29420.0008


30. USNO-A2.0-0900-13034971 is located near the position of a known variable star, NSVS 13891310, discovered by Benko and Csubry (2007) using NSVS data. The angular resolution of the ROTSE-I instrument is insufficient for a decision which star varies. Using our telescope, we confidently identified the variable star and determined its variability parameters. Infrared colors J–H = 1.059, H–K = 0.524 and J–K = 1.583 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and Mira classification.

31. Infrared colors J–H = 0.772, H–K = 0.295 and J–K = 1.067 (2MASS) are consistent with the K-M spectral type (Bessell and Brett 1988) and BY: classification.

32. Infrared colors J–H = 0.778, H–K = 0.245 and J–K = 1.023 (2MASS) are consistent with the K-M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
2455733.90.7
2455781.60.7
2456193.40.3


33. Infrared colors J–H = 1.122, H–K = 0.482 and J–K = 1.604 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.
Maxima:
HJD(TT)±
2455747.9 0.8
2456178.9 0.6


34. Infrared colors J–H = 1.105, H–K = 0.459 and J–K = 1.564 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

35. Infrared colors J–H = 1.125, H–K = 0.424 and J–K = 1.549 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

36. Primary minima:
HJD(TT)±
2456174.31150.0006
2456195.25100.0006
MinII = 14m.48.

37. Infrared colors J–H = 1.202, H–K = 0.438 and J–K = 1.640 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

Remarks:
During observations of a field at the borderline of Ophiuchus and Serpens, we discovered 37 new variable stars. Our observations were carried out at the Astrotel-Caucasus observatory, located at the Astronomical station of the Kazan Federal university, using the 300-mm Ritchey-Chretien telescope, equipped with an unfiltered Apogee Alta U9000 CCD camera. A total of 1327 images with 5-minute exposures were obtained on JD 2455018–2456218. For basic reductions for dark current, flat fields, bias and for removing cosmic-ray 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 0900-13006962 = USNO-B1.0 0936-0378151, α = 18h30m09s.78, δ = +03°36′ 55″.1 (J2000, 2MASS), R1 = 13m.73, R2 = 13m.72 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 13m.725. 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:
Benko, J.M., Csubry, Z., 2007, Acta Astron., 57, 73
Bessell, M.S., Brett, J.M., 1988, Publ. Astron. Soc. Pacific, 100, 1134
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, Astron. J., 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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