Comments:
1. Type EB with period 0d.749593 is not excluded.
2. Primary minimum: HJD(TT) 2455342.5086 ±0.0005.
MinII = 15m.69.
3. Primary minima:HJD(TT) | ± |
2455284.559 |
0.002 |
2455398.314 | 0.001 |
2455713.3760 | 0.0003 |
MinII = 14m.52.
4. A close pair of two stars, not separated in major catalogues.
Maxima:HJD(TT) | ± |
2455342.4444 | 0.0005 |
2455351.4345 | 0.0004 |
2455378.4291 | 0.0008 |
2455713.4591 | 0.0006 |
2455769.306 | 0.001 |
5. The star shows Blazhko effect with the period 36d,
resulting from beating of two oscillations: with the tabulated period and
with a close
period, 0d.470509.
Maxima:HJD(TT) | ± |
2455302.490 | 0.002 |
2455352.367 |
0.003 |
2455367.463 | 0.003 |
2455760.293 |
0.004 |
6. Maxima:HJD(TT) | ± |
2454969.457 | 0.005 |
2455284.516 | 0.004 |
2455342.448 | 0.008 |
2455711.474 | 0.004 |
2455713.431 | 0.005 |
7. Infrared colors J–H = 1.041, H–K = 0.340, J–K = 1.381 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maximum: HJD(TT) 2455308.8.
8. Infrared colors J–H = 0.891, H–K = 0.314, J–K = 1.205 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maximum: HJD(TT) 2455356.5.
9. A close pair of two stars: 2MASS 17354166-1750151 and 2MASS
17354195-1750175. 2MASS 17354166-1750151 varies.
Maxima:HJD(TT) | ± |
2455279.5889 | 0.0010 |
2455351.4341 | 0.0008 |
10. A close pair of two stars: 2MASS 17354422-1807140 and 2MASS
17354406-1807193. 2MASS 17354422-1807140 varies.
Maximum: HJD(TT)
2455279.535±0.004.
12. Primary minima:HJD(TT) | ± |
2455351.457 | 0.004 |
2455769.294 | 0.001 |
MinII = 16m.47.
13. Maxima:HJD(TT) | ± |
2455023.3909 | 0.0001 |
2455342.4033 | 0.0009 |
2455398.3579 | 0.0009 |
2455713.3971 | 0.0007 |
14. Maximum: HJD(TT) 2455769.3212±0.0006.
15. Primary minimum: HJD(TT) 2455398.3820±0.0003.
MinII = 14m.96.
16. Infrared colors J–H = 1.000, H–K = 0.384, J–K = 1.384 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR
classification.
Maximum: HJD(TT) 2455735.5.
17. A close pair of two stars, not separated in major catalogues.
Infrared colors J–H = 0.950, H–K = 0.392, J–K = 1.342
(2MASS)
are consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maximum: HJD(TT) 2455363.6.
18. Maxima:HJD(TT) | ± |
2454968.514 | 0.003 |
2455352.349 | 0.003 |
2455398.346 | 0.004 |
19. Infrared colors J–H = 0.946, H–K = 0.402, J–K = 1.348 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maxima: HJD(TT) 2455019.0; 2455398.4.
20. Primary minima:HJD(TT) | ± |
2455352.3550 | 0.0008 |
2455378.427 | 0.002 |
MinII = 15m.93.
21. Primary minima:HJD(TT) | ± |
2455712.480 | 0.004 |
2455713.4672 | 0.0006 |
MinII = 14m.44.
23. Maxima:HJD(TT) | ± |
2454969.4772 | 0.0009 |
2455023.3698 | 0.0009 |
2455378.4368 | 0.0006 |
24. Infrared colors J–H = 0.717, H–K = 0.237, J–K = 0.954 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR
classification.
Maxima: HJD(TT) 2455349.7; 2455761.0.
25. Infrared colors J–H = 0.988, H–K = 0.506, J–K = 1.494 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maxima: HJD(TT) 2455374.8, 2455002.0, 2455744.0.
26. Primary minima:HJD(TT) | ± |
2455283.5590 | 0.0007 |
2455342.403 | 0.001 |
2455699.4369 | 0.0007 |
2455713.3894 | 0.0005 |
MinII = 16m.70.
27. Maxima:HJD(TT) | ± |
2454969.455 | 0.001 |
2455342.4026 | 0.0007 |
2455769.313 | 0.002 |
28. The star shows Blazhko effect with the period 28d.58, resulting
from beating of two oscillation: with the tabulated period and with a close
period, 0d.455761.
Maxima:HJD(TT) | ± |
2455302.5150 | 0.0006 |
2455351.4348 | 0.0007 |
2455713.463 | 0.001 |
29. Type EB with period 0d.713648 is not excluded.
30. Maxima:HJD(TT) | ± |
2455279.5689 | 0.0009 |
2455342.472 | 0.005 |
31. Infrared colors J–H = 0.814, H–K = 0.359, J–K = 1.173 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maxima: HJD(TT) 2455333; 2455756.
32. Maxima:HJD(TT) | ± |
2455699.455 | 0.001 |
2455713.454 | 0.004 |
34. Maxima:HJD(TT) | ± |
2455367.4638 | 0.0008 |
2455713.3778 | 0.0005 |
2455772.3096 | 0.0008 |
35. Infrared colors J–H = 1.025, H–K = 0.383, J–K = 1.408 (2MASS)
are
consistent with the M spectral type (Bessell and Brett 1988) and SR:
classification.
Maximum: HJD(TT) 2455745.9.
36. MinII = 16m.19.
37. Maximum: HJD(TT) 2455279.521± 0.001.
38. A close triplet of stars 2MASS 17374620-1752201, 2MASS
17374599-1752169 and 2MASS 17374592-1752206. 2MASS 17374620-1752201
varies.
40. A close pair of two stars: USNO-A2.0 0675-20908064 and 2MASS
17380400-1750036. USNO-A2.0 0675-20908064 varies. Blazhko effect,
available observations are insufficient to determine the Blazhko period.
Maxima:HJD(TT) | ± |
2455367.493 | 0.002 |
2455713.4253 | 0.0008 |
41. Maximum HJD(TT) 2455378.419±0.002.
42. Maxima:HJD(TT) | ± |
2455699.498 | 0.002 |
2455713.495 | 0.001 |
43. Maxima:HJD(TT) | ± |
2455351.441 | 0.007 |
2455713.382 | 0.008 |
44. A close pair of two stars, not separated in major catalogues.
Infrared colors J–H = 0.924, H–K = 0.394, J–K = 1.318
(2MASS)
are consistent with the M spectral type (Bessell and Brett 1988) and M
classification.
Maxima: HJD(TT) 2454999.0; 2455334.0.
45. Maxima:HJD(TT) | ± |
2455342.407 | 0.009 |
2455378.414 | 0.001 |
46. Maxima:HJD(TT) | ± |
2455283.539 | 0.005 |
2455352.3857 | 0.0004 |
47. Maximum: HJD(TT) 2455342.4095±0.0050.
48. Maxima:HJD(TT) | ± |
2455279.5690 | 0.0009 |
2455342.441 | 0.002 |
2455367.4850 | 0.0009 |
49. Blazhko effect, available observations are insufficient to
determine the Blazhko period.
Maximum: HJD(TT)
2455713.3739±0.0008.
50. Maximum: HJD(TT) 2455713.4329±0.0020.
Remarks:
During observations of a field in Ophiuchus, we discovered 50 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 648 images with 5-minute exposures were obtained on JD 2454968–2455772.
For basic reductions for dark current, flat fields and bias, 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 0675-20424709 = USNO-B1.0 0719-0588525
(α=17h35m13s.23,
δ= – 18°03′
24″.0
(J2000, 2MASS)),
R1=12m.93, R2=13m.72
(USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming
Rcomp=13m.325.
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 (www.peranso.com);
in order to find Blazhko-effect periods for USNO-A2.0 0675-20455670 and USNO-A2.0
0675-20702192,
we used WinEfk software, developed by Dr. V. P. Goranskij.
Acknowledgements: We would like to thank S. V. Antipin for helpful
discussion.
References:
Bessell, M.S., Brett, J.M., 1988, Publ. of Astron. Society of 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