Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 9, N 4 (2009)

New variable stars in the field of SGR0501+4516

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

Received:   23.01.2009;   accepted:   11.02.2009
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1350-0515378804 59 18.23, +45 13 20.3EW16.7217.48*0.275612454815.5632min Comm. 101_PC-R.png01_ch.jpg01_data.txt
2 USNO-A2.0 1350-0517205605 00 05.31, +45 27 19.4EW16.7317.32*0.331142454703.4495min Comm. 202_PC-R.png02_ch.jpg02_data.txt
3 USNO-A2.0 1350-0518663505 00 43.59, +45 10 57.5EB17.1918.04*0.586082454746.3330min Comm. 303_PC-R.png03_ch.jpg03_data.txt
4 USNO-A2.0 1275-0415175805 01 13.34, +44 55 40.5EW15.5815.72*0.662872454783.4925min Comm. 404_PC-R.png04_ch.jpg04_data.txt
5 USNO-A2.0 1350-0519874405 01 16.40, +45 20 45.6EW17.1617.52*0.458282454782.5474min Comm. 505_PC-R.png05_ch.jpg05_data.txt
6 USNO-A2.0 1350-0519913405 01 17.43, +45 10 58.1EB16.2516.60*0.551492454702.6513min Comm. 606_PC-R.png06_ch.jpg06_data.txt
7 USNO-A2.0 1350-0521911005 02 10.17, +45 14 18.0EA17.0717.68*1.726552454746.3434min Comm. 707_PC-R.png07_ch.jpg07_data.txt
8 USNO-A2.0 1275-0418197605 02 13.43, +44 52 46.7EW16.7617.05*0.229672454827.4154min Comm. 808_PC-R.png08_ch.jpg08_data.txt
9 USNO-A2.0 1350-0522129705 02 15.88, +45 33 39.4EA15.8816.41*2.119042454704.2781min Comm. 909_PC-R.png09_ch.jpg09_data.txt
10 USNO-A2.0 1275-0418599305 02 22.10, +44 52 21.3EB15.6315.99*1.425662454782.2460min Comm. 1010_PC-R.png10_ch.jpg10_data.txt
11 USNO-A2.0 1350-0525448905 03 38.84, +45 19 56.3RRC:15.1915.34*0.31781:2454782.3617max Comm. 1111_PC-R.png11_ch.jpg11_data.txt

Comments:


1. Four observed primary minima: HJD 2454782.2109, 2454783.3101, 2454783.5892, 2454815.5632. Min II = 17.31. O`Connell effect.

2. Three observed primary minima: HJD 2454703.4495, 2454782.2610, 2454783.2531. Min II = 17.30.

3. We observed four primary minima: HJD 2454723.4702, 2454746.3330, 2454783.2555, 2454815.4833. Min II = 17.53.

4. Min II = 15.70. O`Connell effect.

5. We observed five primary minima: HJD 2454782.5474, 2454783.4642, 2454815.5457, 2454826.5462, 2454827.4634. Min II = 17.49.

6. Min II = 16.46.

7. Two observed primary minima: HJD 2454739.4327, 2454746.3434. Min II = 17.63.

8. Three observed primary minima: HJD 2454782.3985, 2454783.3170, 2454827.4154. Min II = 16.98.

9. Min II = 16.19. Possibly RS-type variability in maximum brightness.

10. Two observed primary minima: HJD 2454782.2460, 2454826.4431. Min II = 15.83:. O'Connell effect.

11. The periods 0.29779 d (type RRC), 0.59563 d and 0.63533 d (both type EW) are also possible. J-K = 0.670 (2MASS).

Remarks:
During observations of the field of the soft gamma repeater SGR0501+4516 (Barthelmy et al. 2008), we discovered 11 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. In total, 824 images with 5-minute exposures were obtained on JD 2454702 - 2454829. 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 star was USNO-B1.0 1351-0128409 (05:02:03.24, +45:06:16.1, (J2000), R1 = 14.13, R2 = 14.16). Unfiltered magnitudes were calibrated assuming Rcomp = 14.145. The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Cutri et al. 2003). Our observations were analyzed using Peranso software (www.peranso.com).

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

References:
Barthelmy, S.D., Baumgartner, W.H., Beardmore, A.P., et al., 2008, The Astronomer's Telegramm, 1676
Cutri, R.M., Skrutskie, M.F., van Dyk, S, et al., 2003, 2MASS All Sky Catalog of Point Sources, Centre de Donnees Astronomiques de Strasbourg, II/246
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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