|Article in PDF||
vol. 8, N 29 (2008)
|#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia
Received: 1.07.2008; accepted: 15.09.2008
(E-mail for contact: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org)
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.
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.
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