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Journal "Peremennye Zvezdy"
Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie,
vol. 13, N 2 (2013)

New Variable Stars in Auriga III

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

Received:   20.12.2012;   accepted:   21.02.2013
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)

#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1275-0455985605 14 39.03, +39 14 48.5EA16.7517.05*1.93372455512.4298Min Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 1275-0456263805 14 44.18, +39 22 41.6EW16.3616.84*0.400112455502.3248Min Comm. 202_PC-R.png02_chart.jpg02_data.txt
3 USNO-A2.0 1275-0456625505 14 51.12, +39 13 09.0EW14.3814.78*0.334132455496.2931Min Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 USNO-A2.0 1275-0457128605 15 00.71, +38 58 57.8EW18.5019.00*0.292212455502.456Min Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 USNO-A2.0 1275-0457295305 15 03.90, +39 18 46.5EA16.7017.05*1.12692455571.2139Min Comm. 505_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 1275-0458144705 15 20.21, +39 29 44.2RS:14.1114.22*0.73192455502.410Max Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 1275-0458245605 15 22.12, +39 20 31.8EW17.9018.52*0.285602455538.2660Min Comm. 707_PC-R.png07_chart.jpg07_data.txt
8 USNO-A2.0 1275-0460135705 15 58.52, +39 10 57.7EB16.3916.70*1.54092455573.232Min Comm. 808_PC-R.png08_chart.jpg08_data.txt
9 USNO-A2.0 1275-0460691205 16 09.22, +38 40 56.1EW15.9116.03*0.318352455512.434Max Comm. 909_PC-R.png09_chart.jpg09_data.txt
10 USNO-A2.0 1275-0460834405 16 11.90, +39 03 51.8EA16.6017.04*2.30152455540.2057Min Comm. 1010_PC-R.png10_chart.jpg10_data.txt
11 USNO-A2.0 1275-0461183805 16 18.65, +38 55 11.2DSCT14.0614.12*0.0904652455521.3565Max Comm. 1111_PC-R.png11_chart.jpg11_data.txt
12 USNO-A2.0 1275-0461375105 16 22.20, +38 50 54.9BY:14.3014.49*6.822455496.54Max Comm. 1212_PC-R.png12_chart.jpg12_data.txt
13 USNO-A2.0 1275-0461443505 16 23.61, +39 04 45.6BY:14.6814.76*0.92382455496.621Max Comm. 1313_PC-R.png13_chart.jpg13_data.txt
14 USNO-A2.0 1275-0461757905 16 29.76, +38 41 25.1EW16.8116.98*0.394812455497.273Min Comm. 1414_PC-R.png14_chart.jpg14_data.txt
15 USNO-A2.0 1275-0462579805 16 45.66, +39 16 25.0EW17.9118.68*0.331072455571.2574Min Comm. 1515_PC-R.png15_chart.jpg15_data.txt
16 USNO-A2.0 1275-0463550905 17 04.80, +39 04 20.7EA16.4516.98*2.530:2455538.2000Min Comm. 1616_PC-R.png16_chart.jpg16_data.txt
17 USNO-A2.0 1275-0464154305 17 16.70, +38 49 05.5EW17.8818.31*0.436072455571.221Min Comm. 1717_PC-R.png17_chart.jpg17_data.txt
18 USNO-A2.0 1275-0464181805 17 17.22, +39 08 42.4EA17.2417.76*0.793732455520.4077Min Comm. 1818_PC-R.png18_chart.jpg18_data.txt
19 USNO-A2.0 1275-0464221105 17 17.91, +39 14 53.4BY:14.5314.59*4.842455511.2Max Comm. 1919_PC-R.png19_chart.jpg19_data.txt
20 USNO-A2.0 1275-0465418105 17 42.00, +39 06 34.5EA14.9715.71*2.52932455521.3620Min Comm. 2020_PC-R.png20_chart.jpg20_data.txt
21 USNO-A2.0 1275-0465870905 17 51.27, +38 46 28.7BY:14.9114.98*11.62455497.3Max Comm. 2121_PC-R.png21_chart.jpg21_data.txt
22 USNO-A2.0 1275-0466049105 17 55.04, +38 44 06.7SR:14.0014.18*552455483.5Max Comm. 2222_PC-R.png22_chart.jpg22_data.txt
23 USNO-A2.0 1275-0466196305 17 57.90, +39 15 12.9EB14.1714.25*0.737262455574.622Min Comm. 2323_PC-R.png23_chart.jpg23_data.txt
24 USNO-A2.0 1275-0468168705 18 38.01, +38 41 50.7EB14.1014.81*1.35872455496.605Min Comm. 2424_PC-R.png24_chart.jpg24_data.txt

Comments:


1. Primary minimum: HJD(TT) 2455512.4298 ± 0.0006. MinII = 16m.93.

2. Primary minimum: HJD(TT) 2455502.3248 ± 0.0003. MinII = 16m.80.

3. Primary minima:
HJD(TT)±
2455496.29310.0002
2455502.30910.0003
2455503.31000.0004
2455521.35650.0002
2455529.37300.0004
MinII = 14m.76.

4. MinII = 19m.00.

5. Primary minimum: HJD(TT) 2455571.2139 ± 0.0009. MinII = 17m.03.

6. Despite its infrared colors (J–H = 0.122, H–K = 0.027 and J–K = 0.149, 2MASS), we tentatively suggest the RS: classification.

7. Primary minimum: HJD(TT) 2455538.2660 ± 0.0008. MinII = 18m.32.

8. O'Connell effect. Primary minimum: HJD(TT) 2455573.232 ± 0.002. MinII = 16m.60.

9. Primary minima:
HJD(TT)±
2455512.4340.001
2455538.2210.001
2455573.2360.001
2455574.1950.001
MinII = 16m.03.

10. Primary minimum: HJD(TT) 2455540.2057 ± 0.0003. MinII = 17m.04.

11. Maxima:
HJD(TT)±
2455496.29500.0005
2455521.35650.0005
2455537.18760.0005
2455538.18740.0006
2455538.27420.0003
2455540.26420.0005
2455571.20420.0004
2455572.19900.0004
2455573.19540.0005
2455574.18770.0005
2455596.17460.0002


12. Infrared colors J–H = 0.659, H–K = 0.207 and J–K = 0.866 (2MASS) are consistent with the K spectral type (Bessell and Brett 1988) and BY: classification.

13. Infrared colors J–H = 0.329, H–K = 0.178 and J–K = 0.507 (2MASS) are consistent with the G or K spectral type (Bessell and Brett 1988) and BY: classification.

14. MinII = 16m.97.

15. Primary minima:
HJD(TT)±
2455571.25740.0007
2455572.24890.0006
2455573.24530.0004
MinII = 18m.68.

16. Primary minimum: HJD(TT)2455538.2000 ± 0.0008. MinII = 16m.84. If the tabulated period is correct, then the orbit is eccentric, with the secondary minimum at phase 0.47.

17. Primary minimum: HJD(TT) 2455571.221 ± 0.001. MinII = 18m.28.

18. Depth of primary minimum varies. Primary minima:
HJD(TT)±
2455520.40770.0007
2455540.24860.0006
2455571.20150.0001
MinII = 17m.56.

19. Infrared colors J–H = 0.460, H–K = 0.073 and J–K = 0.533 (2MASS) are consistent with the K spectral type (Bessell and Brett 1988) and BY: classification.

20. Primary minimum: HJD(TT) 2455521.3620 ± 0.0003. MinII = 15m.39.

21. Infrared colors J–H = 0.233, H–K = 0.173 and J–K = 0.406 (2MASS) are consistent with the K: spectral type (Bessell and Brett 1988) and BY: classification.

22. Infrared colors J–H = 1.214, H–K = 0.404 and J–K = 1.618 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification.

23. MinII = 14m.25.

24. MinII = 14m.42:.

Remarks:
During observations of the field in Auriga, we discovered 24 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 571 images with 5-minute exposures were obtained on JD 2455503–2455601. 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 1275-04592684 = USNO-B1.0 1287-0109706 (α = 05h15m41s.84, δ = +38°42′ 02″.3 (J2000, 2MASS)), R1 = 13m.97, R2 = 13m.85 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 13m.91. The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Skrutskie et al. 2006). We searched for periods and epochs of extrema using 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, 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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