Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 8, N 29 (2008)

New Variable Stars in the Field of Tau Aurigae

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

Received:   1.07.2008;   accepted:   15.09.2008
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1275-0549336505 47 53.63, +39 01 40.7EW15.1315.32 0.30432454457.4902min  01.png01.jpg01.txt
2 USNO-A2.0 1275-0550391905 48 18.07, +38 57 09.2EA15.9116.40 0.70772454473.5953min Comm. 202.png02.jpg02.txt
3 USNO-A2.0 1275-0550660605 48 24.46, +39 05 37.5EW16.8517.43 0.33092454430.0040min Comm. 303.png03.jpg03.txt
4 USNO-A2.0 1275-0551213005 48 37.58, +39 10 27.8EW15.5915.86 0.39562454429.6411min Comm. 404.png04.jpg04.txt
5 USNO-A2.0 1275-0552530505 49 08.41, +39 12 36.5EA15.7116.31 1.3130:2454429.7525min Comm. 505.png05.jpg05.txt
6 USNO-A2.0 1275-0552903105 49 17.23, +39 20 12.2EB16.4217.06 0.41052454429.4820min Comm. 606.png06.jpg06.txt
7 USNO-A2.0 1275-0555173805 50 11.45, +39 10 26.2EB14.0314.24 1.19582454405.7351min Comm. 707.png07.jpg07.txt
8 USNO-A2.0 1275-0555289605 50 14.33, +39 19 36.1EW15.9716.61 0.34592454429.5185min Comm. 808.png08.jpg08.txt
9 USNO-A2.0 1275-0555438305 50 17.88, +39 07 12.4EB15.9517.25 0.46522454429.7173min Comm. 909.png09.jpg09.txt
10 USNO-A2.0 1275-0555817005 50 27.03, +39 13 15.0EA14.2215.72 2.63332454412.4971min Comm. 1010.png10.jpg10.txt
11 USNO-A2.0 1275-0556549305 50 45.17, +39 21 21.7EW15.015.27 0.45092454429.8141min Comm. 1111.png11.jpg11.txt
12 USNO-A2.0 1275-0557243705 51 02.11, +39 15 15.8unknown15.7115.91 0.56342454429.7349max Comm. 1212.png12.jpg12.txt

Comments:


2. We observed three primary minima, HJD 2454457.323, 2454461.557, 2454473.5953. A twice longer period is not excluded, P = 1.4155 days.

3. MinII = 17.36.

4. Min II = 15.83.

5. MinII = 15.99.

6. MinII = 16.75.

7. MinII = 14.22. We note a large scatter on the light curve, especially when analyzing data from the two telescopes together.

8. MinII = 16.59.

9. We observed one primary minimum, HJD 2454405.5296. MinII = 16.35.

10. We observed one primary minimum, HJD 2454412.4971.

11. MinII = 15.22.

12. A possible BY Dra variable, but we need more observations for a definite classification.

Remarks:
During observations of the field of Tau Aurigae, we discovered 12 new variable stars. Our observations were carried out in Astrotel-Caucasus observatory using a 300-mm Ritchey-Chretien telescope, equipped with an unfiltered SBIG STL-11000 CCD camera. In total, 295 images with 5-minute exposures were obtained on JD 2454429 - 2454481. Also we used a SkyWatcher 80ED refractor (D=80 mm, F=480 mm), equipped with a SBIG ST-2000 CCD camera without filters, for additional observations of several stars (Nos. 7, 9, 10; JD 2454405 - 2454412, a total of 67 images). Black dots on the light curves are the observations with Ritchey-Chretien telescope and red dots, with the 80-mm refractor. For basic reduction for dark current, flat fields and bias, we used the MaxIm DL software. For variable-star search and photometry of new variables, we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star was USNO-A2.0 1275-05565083 (= USNO-B1 1291-0142214, 05:50:44.05, +39:09:32.9 (J2000); R1 = 13.22, R2 = 13.22). Unfiltered magnitudes were calibrated assuming Rcomp = 13.22. The coordinates in the table are from the 2MASS catalogue.

References:
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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