Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 10, N 3 (2010)

New Variable Stars in Auriga

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

Received:   28.01.2010;   accepted:   2.02.2010
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1200-0276175705 02 42.37, +35 57 44.8EA15.0115.26 0.91782455153.3618Min Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 1200-0276723905 02 57.20, +35 33 40.5EA14.9115.15 3.60852455167.397Min Comm. 202_PC-R.png02_chart.jpg02_data.txt
3 USNO-A2.0 1200-0276835205 03 00.14, +35 55 55.8EW18.5718.98 0.31252455154.358Min Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 USNO-A2.0 1200-0277187605 03 09.71, +36 19 30.7BY15.5815.65 15.22455132.32Max Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 USNO-A2.0 1200-0277428005 03 15.94, +35 56 27.2EA17.1917.95 2.7752455120.4788Min  05_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 1200-0277465505 03 16.87, +35 48 13.4EW16.6217.17 0.33222455125.4514Min Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 1200-0278169705 03 34.94, +36 17 40.9EW17.7718.23 0.39582455125.4413Min Comm. 707_PC-R.png07_chart.jpg07_data.txt
8 USNO-A2.0 1200-0278304805 03 38.31, +35 34 04.2EA17.6918.01 1.0252455124.4326Min Comm. 808_PC-R.png08_chart.jpg08_data.txt
9 USNO-A2.0 1200-0280052305 04 23.77, +35 39 59.5EW17.8218.50 0.23502455146.3293Min Comm. 909_PC-R.png09_chart.jpg09_data.txt
10 USNO-A2.0 1200-0280093105 04 24.74, +35 54 01.9BY:15.5715.63 4.992455122.07Max Comm. 1010_PC-R.png10_chart.jpg10_data.txt
11 USNO-A2.0 1200-0280117905 04 25.37, +36 06 03.3EB18.1318.78 0.41192455132.3680Min Comm. 1111_PC-R.png11_chart.jpg11_data.txt
12 USNO-A2.0 1200-0280280905 04 29.36, +36 21 37.3EA/RS15.8916.06 0.93412455154.3153Min Comm. 1212_PC-R.png12_chart.jpg12_data.txt
13 USNO-A2.0 1200-0280342605 04 30.92, +36 00 29.8EA16.4216.85 1.72832455131.428Min Comm. 1313_PC-R.png13_chart.jpg13_data.txt
14 USNO-A2.0 1200-0280517905 04 35.32, +36 13 14.8EW15.7915.88 0.48262455125.4372Min Comm. 1414_PC-R.png14_chart.jpg14_data.txt
15 USNO-A2.0 1200-0281159205 04 51.34, +35 51 17.0RRAB17.0018.26 0.54362455146.3429Max Comm. 1515_PC-R.png15_chart.jpg15_data.txt
16 USNO-A2.0 1200-0281593805 05 02.56, +35 41 06.2DSCT15.6615.71 0.13302455153.3696Max Comm. 1616_PC-R.png16_chart.jpg16_data.txt
17 USNO-A2.0 1200-0282302705 05 20.59, +35 36 01.1EB17.8618.63 0.70242455146.3327Min Comm. 1717_PC-R.png17_chart.jpg17_data.txt
18 USNO-A2.0 1200-0282690605 05 30.46, +36 15 56.4EW17.0417.32 0.33842455146.3292Min Comm. 1818_PC-R.png18_chart.jpg18_data.txt
19 USNO-A2.0 1200-0283474805 05 50.63, +36 11 44.7EW17.6317.98 0.28062455154.3137Min Comm. 1919_PC-R.png19_chart.jpg19_data.txt
20 USNO-A2.0 1200-0283522405 05 51.86, +36 17 53.5 15.1015.17 4.452455122.139Max Comm. 2020_PC-R.png20_chart.jpg20_data.txt
21 USNO-A2.0 1200-0283638705 05 54.87, +35 43 31.0EB16.4116.50 0.81762455119.8451Min Comm. 2121_PC-R.png21_chart.jpg21_data.txt
22 USNO-A2.0 1200-0283971605 06 03.57, +36 20 05.1BY:14.8014.93 12.82455141.06Max Comm. 2222_PC-R.png22_chart.jpg22_data.txt
23 USNO-A2.0 1200-0284402405 06 14.85, +36 10 26.4RRC16.5016.60 0.35332455154.3424Max Comm. 2323_PC-R.png23_chart.jpg23_data.txt
24 USNO-A2.0 1200-0284878305 06 26.78, +35 31 04.8EW16.4517.00 0.36682455124.4435Min Comm. 2424_PC-R.png24_chart.jpg24_data.txt
25 USNO-A2.0 1200-0284973905 06 29.37, +35 51 06.5BY14.6214.69 5.352455123.98Max Comm. 2525_PC-R.png25_chart.jpg25_data.txt
26 USNO-A2.0 1200-0285786805 06 49.05, +35 42 27.6BY14.5014.57 2.92455119.86Max Comm. 2626_PC-R.png26_chart.jpg26_data.txt
27 USNO-A2.0 1200-0285884005 06 51.42, +35 46 34.8EW17.6017.88 0.57812455159.2500Min Comm. 2727_PC-R.png27_chart.jpg27_data.txt

Comments:


1. Primary minima:
HJD(TT)+/-
2455131.33400.0006
2455153.36180.0002
MinII=15m.19.

2. Primary minimum: HJD(TT) 2455167.397 +/- 0.001. MinII=14m.97.

3. Primary minimum: HJD(TT) 2455154.358 +/- 0.001. MinII=18m.93.

4. Infrared colors J-H=0.543, H-K=0.133, J-K=0.676 (2MASS) are consistent with dK spectral type (Bessell and Brett 1988) and BY classification.

6. Primary minima:
HJD(TT)+/-
2455119.47140.0005
2455124.45740.0004
2455125.45140.0003
2455126.44730.0005
2455148.36970.0006
2455154.35240.0004
2455167.30800.0007
MinII=17m.10.

7. Primary minima:
HJD(TT)+/-
2455125.44130.0007
2455148.39710.0009
2455154.331 0.001
MinII=18m.18.

8. Primary minima:
HJD(TT)+/-
2455124.43260.0008
2455125.455 0.002
2455126.478 0.001


9. Primary minima:
HJD(TT)+/-
2455124.47320.0009
2455125.41250.0007
2455146.32930.0005
2455153.37800.0007
2455154.32010.0009
2455159.25440.0007
2455160.193 0.001
MinII=18m.36.

10. Infrared colors J-H=0.391, H-K=0.109, J-K=0.500 (2MASS) are consistent with dK spectral type (Bessell and Brett 1988) and BY: classification.

11. Primary minima:
HJD(TT)+/-
2455132.36800.0009
2455153.37350.0005
MinII=18m.44.

12. Infrared colors J-H=0.391, H-K=0.062, J-K=0.453 (2MASS) are consistent with RS classification. Primary minima:
HJD(TT)+/-
2455125.354 0.001
2455153.37940.0009
2455154.31530.0006
MinII=15m.94.

13. Primary minimum: HJD(TT) 2455131.428 +/- 0.001. MinII=16m.48.

14. Primary minima:
HJD(TT)+/-
2455124.46840.0009
2455125.43720.0005
2455154.398 0.001
2455160.19350.0008
2455167.435 0.002
MinII=15m.86.

15. Blazhko effect. On the phased light curve, black points correspond to observations on JD 2455118-2455132; red points, on JD 2455146-2455158; green points, on JD 2455159-2455176.
Four maxima:
HJD(TT)+/-
2455129.46850.0005
2455146.34290.0004
2455147.42730.0008
2455153.38910.0007


16. Maxima:
HJD(TT)+/-
2455119.4500.0015
2455125.4370.0011
2455146.323 0.0017
2455153.36960.0009
2455154.3039 0.0009


17. Primary minima:
HJD(TT)+/-
2455146.33270.0009
2455153.35010.0009
MinII=18m.37.

18. Primary minima:
HJD(TT)+/-
2455124.33320.0005
2455146.32920.0005
2455160.204 0.001
MinII=17m.32.

19. Primary minima:
HJD(TT)+/-
2455148.42030.0006
2455154.31370.0007
MinII=17m.92.

20. Period 8d.77 and type ELL: are possible. Infrared colors J-H=0.157, H-K=0.077, J-K=0.234 (2MASS) are consistent with dF spectral type (Bessell and Brett 1988).

21. MinII=16m.43.

22. Infrared colors J-H=0.744, H-K=0.221, J-K=0.965 (2MASS) are consistent with K spectral type (Bessell and Brett 1988) and BY: classification.

23. Infrared colors J-H=0.326, H-K=0.023, J-K=0.349 (2MASS) are consistent with RRC classification.
Maxima:
HJD(TT)+/-
2455125.37560.0010
2455154.34240.0008


24. Primary minima:
HJD(TT)+/-
2455124.44350.0002
2455128.47630.0008
2455159.28530.0006
2455167.35460.0007
MinII=16m.97.

25. Infrared colors J-H=0.575, H-K=0.270, J-K=0.845 (2MASS) are consistent with K spectral type (Bessell and Brett 1988) and BY classification.

26. Infrared colors J-H=0.603, H-K=0.202, J-K=0.805 (2MASS) are consistent with dK spectral type (Bessell and Brett 1988) and BY classification.

27. Primary minimum: HJD(TT) 2455159.2500 +/- 0.0006. MinII=17m.79.

Remarks:
During observations of a field in Auriga, we discovered 27 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 776 images with 5-minute exposures were obtained on JD 2455119 - 2455176. 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 1200-02802479 = USNO-B1.0 1257-0088583 (RA=05:04:28.582, Dec=+35:45:24.61, J2000, 2MASS) R1=13m.86, R2=13m.54 (USNO-B1.0) Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp=13m.70. 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)

Acknowledgements: We would like to thank S.V. Antipin and N.N. Samus for helpful discussion.

References:
Bessell, M.S., Brett, J.M., 1988, PASP, 100, 1134
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
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, AJ, 131, 1163



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