Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 12, N 17 (2012)

New Variable Stars in Ophiuchus III

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

Received:   20.08.2012;   accepted:   22.11.2012
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 0975-0868529916 56 39.55, +11 26 32.9EW16.0316.27 0.282522455720.3404Min Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 0975-0869208216 57 09.87, +11 25 35.7BY:15.2715.54 4.6462455635.30Max Comm. 202_PC-R.png02_chart.jpg02_data.txt
3 USNO-A2.0 0975-0869347116 57 16.18, +11 47 53.4EW15.1015.36 0.338312455649.5475Min Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 USNO-A2.0 0975-0869541216 57 24.72, +12 00 41.1BY:15.1715.29 4.4032455633.9Max Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 USNO-A2.0 0975-0870579916 58 09.90, +11 31 53.2EW14.9515.10 0.403902455632.621Min Comm. 505_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 0975-0870742116 58 16.76, +11 23 14.5BY:13.3813.49 362455732.7Max Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 0975-0871168916 58 36.02, +12 03 46.0EW17.6818.37 0.271952455676.432Min Comm. 707_PC-R.png07_chart.jpg07_data.txt
8 USNO-A2.0 0975-0871624216 58 54.55, +11 46 19.5EW13.5413.63 0.300422455633.101Min Comm. 808_PC-R.png08_chart.jpg08_data.txt

Comments:


1. Minimum: HJD(TT) 2455720.3404±0.0009.

2. Infrared colors J–H = 0.591, H–K = 0.159, J–K = 0.750 (2MASS) are consistent with the K spectral type (Bessell and Brett 1988) and BY: classification.

3. O'Connell effect. Primary minima:
HJD(TT)±
2455649.54750.0004
2455723.29950.0006
MinII=15m.33.

4. Infrared colors J–H = 0.544, H–K = 0.272, J–K = 0.816 (2MASS) are consistent with the K or M spectral type (Bessell and Brett 1988) and BY: classification.

5. O'Connell effect. MinII=15m.06.

6. Infrared colors J–H = 0.676, H–K = 0.108, J–K = 0.784 (2MASS) are consistent with the K spectral type (Bessell and Brett 1988) and BY: classification.

7. Primary minima:
HJD(TT)±
2455676.432 0.001
2455679.424 0.001
MinII=18m.37.

8. MinII=13m.61.

Remarks:
During observations of a field in Ophiuchus, we discovered eight 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 326 images with 5-minute exposures were obtained on JD 2455632–2455749. 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 0975-08679115 = USNO-B1.0 1020-0315967 (α=16h56m12s.11, δ=+12°04′ 04″.5 (J2000, 2MASS)), R1=14m.63, R2=14m.78 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp=14m.705. 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).

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



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