Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 11, N 4 (2011)

New Variable Stars in Auriga II

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

Received:   3.11.2010;   accepted:   28.01.2011
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1200-0412499405 58 11.90, +34 53 11.7EB18.0618.51 0.623862455191.296Min Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 1200-0412808505 58 18.46, +34 54 07.7EW17.6817.93 0.399482455275.254Min Comm. 202_PC-R.png02_chart.jpg02_data.txt
3 USNO-A2.0 1200-0414262905 58 48.65, +35 07 28.4EW17.6617.92 0.292952455191.4183Min Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 USNO-A2.0 1200-0415139305 59 06.36, +35 20 28.5EA15.9316.35 0.861982455275.2015Min Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 USNO-A2.0 1200-0415694305 59 17.66, +34 37 15.8EW17.5917.94 0.305692455189.2551Min Comm. 505_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 1200-0415794505 59 19.76, +34 48 10.9EA18.1118.93 1.11122455191.255Min Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 1200-0416203705 59 28.60, +35 09 45.3EA14.0414.37 1.85582455189.6074Min  07_PC-R.png07_chart.jpg07_data.txt
8 USNO-A2.0 1200-0418185706 00 12.56, +34 37 31.0BY:16.4616.59 1.66132455191.408Max Comm. 808_PC-R.png08_chart.jpg08_data.txt
9 USNO-A2.0 1200-0419834406 00 50.57, +34 58 19.3EW15.0915.26 0.396802455205.285Min Comm. 909_PC-R.png09_chart.jpg09_data.txt
10 USNO-A2.0 1200-0420426206 01 03.75, +34 34 35.5EW16.2516.63 0.358212455191.2245Min Comm. 1010_PC-R.png10_chart.jpg10_data.txt
11 USNO-A2.0 1200-0420519606 01 05.86, +35 20 07.1EB14.3114.51: 1.2512455189.419:Min Comm. 1111_PC-R.png11_chart.jpg11_data.txt
12 USNO-A2.0 1200-0421775706 01 34.46, +34 37 38.7SR:15.1515.40 22.42455227.96Max Comm. 1212_PC-R.png12_chart.jpg12_data.txt
13 USNO-B1.0 1251-011984106 01 54.26, +35 06 52.3SR:17.9419.88 168:2455280.3Max Comm. 1313_PC-R.png13_chart.jpg13_data.txt

Comments:


1. Primary minimum:HJD(TT) 2455191.296 ± 0.002. MinII=18m.36.

2. Primary minimum:HJD(TT) 2455275.254 ± 0.002. MinII=17m.93. P = 0.33285 d is also possible.

3. MinII=17m.85.

4. Primary minima:
HJD(TT)±
2455275.20150.0007
2455306.232 0.003
MinII=16m.01.

5. Primary minima:
HJD(TT)±
2455189.25510.0002
2455234.18840.0004
MinII=17m.93.

6. Primary minimum:HJD(TT) 2455191.255 ± 0.002. MinII=18m.77.

8. Infrared colors J–H = 0.350, H–K = 0.153 and J–K = 0.503 (2MASS) are consistent with the dK spectral type (Bessell and Brett 1988) and BY: classification.

9. A close pair of two stars, 2MASS 06005035+3458191 and 2MASS 06005069+3458190. The angular resulution of our telescope is insufissient to determine which of the two stars varies. Primary minimum: HJD(TT) 2455205.285 ± 0.001. MinII=15m.21.

10. Primary minimum: HJD(TT) 2455191.2245 ± 0.0009. MinII=16m.60.

11. MinII=14m.42.

12. Infrared colors J–H = 0.871, H–K = 0.285 and J–K = 1.156 (2MASS) are consistent with the gM spectral type (Bessell and Brett 1988) and SR classification.

13. Infrared colors J–H = 1.021, H–K = 0.300 and J–K = 1.321 (2MASS) are consistent with the gM spectral type (Bessell and Brett 1988) and SR: classification. The tabulated period is uncertain, it is longer than the time span of our observations.

Remarks:
During observations of a field in Auriga, we discovered 13 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 316 images with 5-minute exposures were obtained on JD 2455189–2455326. 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 1200-04190505 = USNO-B1.0 1251-0119138 (α = 06h00m32s.51, δ = +35°11′ 08″.4, J2000, 2MASS), R1 = 14m.55, R2 = 14m.30 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 14m.425. 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, 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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