Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 8, N 48 (2008)

New Variable Stars in Andromeda

T. Kryachko#1, A. Samokhvalov#2, S. A. Korotkiy#3
#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia;
#3. Ka-Dar Scientific Center and Public Observatory, Moscow, Russia

Received:   24.11.2008;   accepted:   8.12.2008
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, astro_stas@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1275-0117041701 57 39.91, +43 55 03.7EW16.8917.55 0.281332454712.3808min Comm. 101.png01ch.jpg01.txt
2 USNO-A2.0 1275-0117221501 57 51.11, +44 02 14.7EW17.1217.68 0.309032454776.5584min Comm. 202.png02ch.jpg02.txt
3 USNO-A2.0 1275-0117322901 57 57.20, +44 27 50.9EW16.3216.78 0.352912454773.3070min Comm. 303.png03ch.jpg03.txt
4 GSC 2828-01238, USNO-A2.0 1275-0117689501 58 18.23, +43 59 27.0EB14.3514.81 0.716812454713.3508min Comm. 404.png04ch.jpg04.txt
5 GSC 2828-01525, USNO-A2.0 1275-0118196201 58 47.77, +44 33 04.8EB14.5514.80 0.431412454775.5306min Comm. 505.png05ch.jpg05.txt
6 USNO-A2.0 1275-0118706101 59 17.89, +44 07 57.8EW15.6216.10 0.310922454711.3850min Comm. 606.png06ch.jpg06.txt
7 USNO-A2.0 1275-0119860302 00 24.69, +44 22 56.5EW16.0516.20 0.347082454712.2955min Comm. 707.png07ch.jpg07.txt
8 GSC 2841-01199, USNO-A2.0 1275-0120983102 01 29.99, +44 29 14.9EA13.9114.26 0.885082454713.4729min Comm. 808.png08ch.jpg08.txt
9 USNO-A2.0 1275-0121577202 02 03.61, +43 54 35.2EW16.0316.42 0.334792454713.3474min Comm. 909.png09ch.jpg09.txt
10 USNO-A2.0 1275-0121713202 02 11.35, +44 19 49.6DSCT16.6716.85 0.138052454712.3354max Comm. 1010.png10ch.jpg10.txt
11 GSC 2841-00086, USNO-A2.0 1275-0122689702 03 08.40, +44 10 23.4EW13.9814.07 0.391772454774.3713min Comm. 1111.png11ch.jpg11.txt
12 GSC 2841-02117, USNO-A2.0 1275-0123013802 03 27.78, +44 14 51.0EW12.1712.30 0.329782454775.5870min Comm. 1212.png12ch.jpg12.txt

Comments:


1. We observed six primary minima: HJD 2454712.3808, 2454713.5038, 2454774.2700, 2454774.5549, 2454776.2386, 2454776.5200. Min II = 17.36.

2. We observed four primary minima: HJD 2454712.2847, 2454713.5099, 2454776.2531, 2454776.5584. Min II = 17.52.

3. We observed five primary minima: HJD 2454713.3051, 2454714.3669, 2454773.3070, 2454776.4822, 2454778.5956. Min II = 16.72.

4. We observed three primary minima: HJD 2454713.3508, 2454774.2818, 2454778.5807. Min II = 14.57. O`Connell effect.

5. We observed eight primary minima: HJD 2454712.5449, 2454713.4036, 2454714.2727, 2454773.3661, 2454774.2335, 2454775.5306, 2454776.3988, 2454778.5484. Min II = 14.70.

6. We observed eight primary minima: HJD 2454711.3850, 2454712.3173, 2454713.2485, 2454713.5593, 2454773.2580, 2454774.1900, 2454776.3647, 2454778.5448. Min II = 15.99.

7. We observed three primary minima: HJD 2454712.2955, 2454713.3350, 2454714.3863. Min II = 16.17.

8. Two observed primary minima: HJD 2454713.4729, 2454776.3105. Min II = 14.23. O`Connell effect.

9. We observed five primary minima: HJD 2454712.3390, 2454713.3474, 2454773.2665, 2454774.2794, 2454776.2840. Min II = 16.38.

10. We observed five maxima: HJD 2454712.3354, 2454713.3037, 2454713.4459, 2454714.4115, 2454773.2268.

11. We observed five primary minima: HJD 2454713.2543, 2454773.2084, 2454774.3713, 2454775.5435, 2454776.3241. Min II = 14.06.

12. Two observed primary minima: HJD 2454712.2646, 2454775.5870. Min II = 12.25. This low-amplitude variable was also observed by ROTSE-I/NSVS (NSVS 3971176, Wozniak et al. 2004). The NSVS data are not in agreement with our period. The period of 0.3272 days looks suitable both for our and NSVS observations, but the phased light curve for our data plotted using this period looks much worse than for P = 0.32978 days.

Remarks:
During observations of the field of the cataclysmic variable star OT J020025.4+441019 (Kryachko et al. 2008), we discovered 12 new variable stars. Our observations were carried out at the Astrotel-Caucasus observatory using a 80-mm ED-refractor, equipped with an unfiltered SBIG ST-2000XM CCD camera. In total, 564 images with 5-minute exposures were obtained on JD 2454711 - 2454778. Besides, 215 images with 2-minute exposures were obtained on JD 2454713. For basic reductions for dark current, flat fields, and bias, we used the MaxIm DL software. For search and photometry of new variable stars, we applied the VaST software by Sokolovsky and Lebedev (2005). The comparison star was USNO-B1.0 1341-0037983 (01:58:00.19, +44:07:33.5, (J2000), R1 = 13.64, R2 = 13.61). Our unfiltered magnitudes were calibrated assuming Rcomp = 13.625 for the comparison star. Coordinates of the variable stars in the table were drawn from the 2MASS catalogue. Our observations were analyzed using the Peranso software (www.peranso.com).

References:
Kryachko, T., Korotkiy, S., Denisenko, D., Satovskiy, B., 2008, vsnet-alert, 10478
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
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W., et al., 2004, Astron. J., 127, 2436



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