Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.astronet.ru/db/varstars/msg/1248519
Дата изменения: Sun Jan 14 09:54:56 1973 Дата индексирования: Sun Feb 3 15:03:46 2013 Кодировка: Поисковые слова: regolith |
#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia; #3. Ka-Dar Scientific Center and Public Observatory, Moscow, Russia; #4. Instituto de Astronomía Teórica y Experimental, Conicet-UNC, Córdoba, Argentina |
Received: 4.12.2010; accepted: 11.03.2011
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, astro_stas@mail.ru, dgl@oac.uncor.edu)
|
Comments:
1. Period 0d.3351 is also possible. Primary minima:MinII=14m.36.
HJD(TT) ± 2455477.8099 0.0008 2455481.8315 0.0007 2455483.8408 0.0007
2. Periods 0d.3053 or 0d.4396 are also possible. MinII=16m.65.
3. Primary minima:MinII=15m.66.
HJD(TT) ± 2455478.8477 0.0008 2455483.8329 0.0005
4. A close pair of two stars: USNO-A2.0 0525-03533089 and USNO-A2.0 0525-03533312. USNO-A2.0 0525-03533089 varies.
5. Maxima:
HJD(TT) ± 2455480.8375 0.0007 2455481.8357 0.0009 2455482.8317 0.0007
6. Maxima:
HJD(TT) ± 2455475.6092 0.0008 2455481.5989 0.0008
7. Periods 1d.6383 or 2d.47 are also possible. Infrared colors J–H=0.537, H–K=0.127, J–K=0.664 (2MASS) are consistent with the K spectral type (Bessell and Brett 1988) and BY: classification.Remarks:
During observations of two fields in the southern hemisphere (see the following table) we discovered seven new variable stars.
Field α δ Number of images JD start JD end 1 06h 50m 29s –36° 11′ 01″ 316 2455475 2455486 2 23h 12m 35s –28° 30′ 31″ 486 2455475 2455486
Our observations were carried out in Tolar Grande, Argentina, using the 80-mm f/6 ED refractor, equipped with an unfiltered SBIG ST-2000XM CCD camera. All images were taken with 5-minute exposure times. For basic reductions 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 stars for two fields were the following:The coordinates of the variable and comparison stars in the tables were drawn from the 2MASS catalogue (Skrutskie et al. 2006). The R1 and R2 magnitudes of the comparison stars were drawn from the USNO-B1.0 catalogue (Monet et al. 2003). Unfiltered magnitudes were calibrated using the Rcomp magnitudes from the last table. For search for periods and epochs of extrema, we use Peranso software (www.peranso.com).
Field Comparison star α δ R1 R2 Rcomp 1 USNO-A2.0 0525-03545983 06h 50m 29s.28 –36° 22′ 17″.2 13m.47 13m.33 13m.40 2 USNO-A2.0 0600-44465807 23h 13m 40s.95 –28° 21′ 34″.6 12m.45 12m.44 12m.445
Acknowledgements: We would like to thank S. V. Antipin for helpful discussion.References:
Bessell, M.S., Brett, J.M., 1988, PASP, 100, 1134
Monet, D.G., Levine, S.E., Casian, B., et al., 2003, Astron. J., 125, 984
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