Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 8, N 43 (2008)

New Variable Stars in Ophiuchus

T. Kryachko#1, A. Samokhvalov#2, D. Denisenko#3, B. Satovskiy#1
#1. Astrotel Observatory, Karachay-Cherkessia, Russia
#2. Surgut, Russia
#3. Space Research Institute (IKI), Moscow, Russia

Received:   20.11.2008;   accepted:   24.11.2008
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, denis@hea.iki.rssi.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 0975-1046394018 06 37.24, +10 07 11.4SXPHE15.7616.31 0.112302454609.4646max Comm. 101.png01ch.jpg01.txt
2 USNO-A2.0 0975-1047061918 06 45.53, +10 28 18.2EW15.9516.27 0.464232454609.3814min Comm. 202.png02ch.jpg02.txt
3 USNO-A2.0 0975-1047489818 06 50.92, +10 05 35.7EB13.8414.35 0.635232454608.8902min Comm. 303.png03ch.jpg03.txt
4 USNO-A2.0 0975-1048965418 07 09.37, +10 17 15.7RRAB>14.2314.77 0.567502454608.5664:max  04.png04ch.jpg04.txt
5 USNO-A2.0 0975-1049472918 07 15.69, +10 07 45.0EW16.4617.40 0.304012454610.4603min Comm. 505.png05ch.jpg05.txt
6 USNO-A2.0 0975-1051970018 07 46.59, +10 15 15.7EW15.1315.61 0.376512454609.1348min Comm. 606.png06ch.jpg06.txt
7 USNO-A2.0 0975-1053028218 07 59.52, +09 58 54.4EB16.3416.90 0.777922454609.1939min Comm. 707.png07ch.jpg07.txt
8 USNO-A2.0 0975-1053344918 08 03.32, +10 11 10.4RRAB16.6418.0 0.586912454610.3279max Comm. 808.png08ch.jpg08.txt
9 USNO-A2.0 0975-1054252518 08 14.18, +10 04 52.7EW16.7517.28 0.365482454609.3880min Comm. 909.png09ch.jpg09.txt
10 USNO-A2.0 0975-1056346618 08 38.67, +09 56 07.6EA13.7414.34 0.890452454635.4642min Comm. 1010.png10ch.jpg10.txt
11 USNO-A2.0 0975-1056935818 08 45.59, +10 08 44.5RRC13.1113.66 0.263842454610.4710max Comm. 1111.png11ch.jpg11.txt
12 USNO-A2.0 0975-1058606718 09 05.42, +09 57 11.0EW16.2416.51 0.369502454609.3275min Comm. 1212.png12ch.jpg12.txt
13 USNO-A2.0 0975-1058739318 09 06.98, +10 15 23.0EW15.5516.08 0.369842454609.4690min Comm. 1313.png13ch.jpg13.txt
14 USNO-A2.0 0975-1058984818 09 09.97, +10 18 23.6RRAB15.5916.46 0.536792454635.4458max Comm. 1414.png14ch.jpg14.txt
15 USNO-A2.0 0975-1059480218 09 15.85, +10 18 56.7RRC15.8316.29 0.329112454608.6721max  15.png15ch.jpg15.txt
16 USNO-A2.0 0975-1060975418 09 33.66, +10 21 04.1EA15.4415.83 0.351842454608.5423min Comm. 1616.png16ch.jpg16.txt
17 USNO-A2.0 0975-1061972918 09 45.03, +10 24 57.1EW15.8416.17 0.348542454610.3426min Comm. 1717.png17ch.jpg17.txt
18 USNO-B1.0 1004-031782218 09 43.39, +10 25 48.8RRAB17.118.0 0.617222454611.0133max Comm. 1818.png18ch.jpg18.txt

Comments:


1. Five observed maxima: HJD 2454608.4576, 2454609.3469, 2454609.4646, 2454610.3674, 2454631.4796. A 1-day alias, P = 0.10096, is also possible.

2. We observed one primary minimum, HJD 2454609.3814. Min II = 16.16.

3. Min II = 14.02.

5. Min II = 17.16.

6. Min II = 15.5. O'Connell effect.

7. Min II = 16.58.

8. One observed maximum, HJD 2454610.3279.

9. We observed one primary minimum, HJD 2454609.3880. Min II = 17.2. The coordinates are from the USNO-A2.0 catalogue.

10. We observed one primary minimum, HJD 2454635.4642. Min II = 13.92. The light curve shape varies from one maximum to another.

11. Two observed maxima: HJD 2454609.4208, 2454610.4710.

12. We observed one primary minimum, HJD 2454609.3275. Min II = 16.49.

13. We observed one primary minimum, HJD 2454609.4690. Min II = 15.97.

14. One observed maximum, HJD 2454635.4458.

16. Min II = 15.6. O'Connell effect.

17. We observed one primary minimum, HJD 2454610.3426. Min II = 16.14.

18. The coordinates are from the USNO-B1.0 catalogue.

Remarks:
During observations of the field of the cataclysmic variable star 1RXS J180834.7+101041 (Denisenko et al. 2008) we discovered 18 new variable stars. Our observations were carried out at Astrotel-Caucasus observatory using a 300-mm Ritchey-Chretien telescope, equipped with an unfiltered SBIG STL-11000 CCD camera. In total, 248 images with 5-minute exposures were obtained on JD 2454608-2454648. For basic reduction for dark current, flat fields, and bias, we used MaxIm DL software. For search and photometry of new variable stars, we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star is USNO-B1.0 1001-0318048 (18:09:22.82, +10:06:29.2, (J2000), R1 = 14.62, R2 = 14.97). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 14.795. The coordinates were drawn from the 2MASS catalogue if a different source is not specified in the Comments.

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

References:
Denisenko, D.V., Kryachko, T.V., Satovskiy, B.L., 2008, The Astronomer's Telegram, #1640
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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