Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 11, N 31 (2011)

New Variable Stars in the Field of V458 Vul

V. Solovyov#1, A. Samokhvalov#2, B. Satovskiy#3
#1. Kazan Federal University, Russia;
#2. Surgut, Russia;
#3. Astrotel Observatory, Karachay-Cherkessia, Russia

Received:   13.05.2011;   accepted:   14.11.2011
(E-mail for contact: solo.vya@gmail.com, sav@surgut.ru, bs25@mail.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1050-1535064019 52 18.48, +20 53 28.7EA14.5514.88V1.1674:2454780.252Min  01_PC-V.png01_chart.jpg01_data.txt
2 USNO-A2.0 1050-1537385219 52 34.45, +20 57 33.9EA/RS13.8414.32V0.8219122454725.748Min Comm. 202_PC-V.png02_chart.jpg02_data.txt
3 USNO-A2.0 1050-1539777319 52 50.65, +20 51 41.9HADS15.7916.26V0.0973012455504.1465Max Comm. 303_PC-V.png03_chart.jpg03_data.txt
4 USNO-A2.0 1050-1541076519 52 58.97, +20 57 46.2EB15.2615.92V1.281842454725.343Min Comm. 404_PC-V.png04_chart.jpg04_data.txt
5 USNO-A2.0 1050-1541291419 53 00.34, +20 59 10.6EW15.4116.17V0.3610212454727.2910Min Comm. 505_PC-V.png05_chart.jpg05_data.txt
6 USNO-A2.0 1050-1541912719 53 04.26, +20 30 35.6EW14.7815.28V0.4102832454781.2111Min Comm. 606_PC-V.png06_chart.jpg06_data.txt
7 2MASS 19531118+210622219 53 11.19, +21 06 22.3EW15.0215.58V0.5392692454781.2087Min Comm. 707_PC-V.png07_chart.jpg07_data.txt
8 USNO-A2.0 1050-1544820119 53 23.19, +21 15 03.7RRC14.8215.03V0.3427242454725.301Max Comm. 808_PC-V.png08_chart.jpg08_data.txt
9 USNO-A2.0 1050-1545281519 53 26.22, +21 15 33.2EW14.7914.98V0.2633442454725.3141Min Comm. 909_PC-V.png09_chart.jpg09_data.txt
10 2MASS 19533296+203809619 53 32.96, +20 38 09.7EB13.5313.85V0.6874462455516.1803Min Comm. 1010_PC-V.png10_chart.jpg10_data.txt
11 USNO-A2.0 1050-1547478719 53 40.39, +20 38 24.5EA14.4315.40V1.913312455518.135Min  11_PC-V.png11_chart.jpg11_data.txt
12 USNO-A2.0 1050-1550117719 53 57.05, +21 04 27.0EW14.1514.32V0.3810422454726.3707Min Comm. 1212_PC-V.png12_chart.jpg12_data.txt
13 USNO-A2.0 1050-1550475619 53 59.31, +21 07 28.8EB14.4314.68V1.049612454726.053Min Comm. 1313_PC-V.png13_chart.jpg13_data.txt
14 USNO-A2.0 1050-1550503719 53 59.50, +20 52 51.6EA15.5516.24V1.1060412454727.2950Min Comm. 1414_PC-V.png14_chart.jpg14_data.txt
15 USNO-A2.0 1050-1554893019 54 26.62, +20 34 14.4EB15.1415.72V1.080872454725.843Min Comm. 1515_PC-V.png15_chart.jpg15_data.txt
16 USNO-A2.0 1050-1556334819 54 35.21, +20 59 22.4EW16.6117.17V0.3087262454726.726Min Comm. 1616_PC-V.png16_chart.jpg16_data.txt
17 USNO-A2.0 1050-1556426019 54 35.70, +20 44 17.6SR:12.16:12.33V29.5:2454725.3Max Comm. 1717_PC-V.png17_chart.jpg17_data.txt
18 USNO-A2.0 1050-1556458419 54 35.97, +21 09 43.4EA15.6816.13V1.1302062455516.2329Min Comm. 1818_PC-V.png18_chart.jpg18_data.txt
19 USNO-A2.0 1050-1556743919 54 37.74, +20 23 35.3EW16.0116.47V0.3116532454780.193Min Comm. 1919_PC-V.png19_chart.jpg19_data.txt
20 USNO-A2.0 1050-1557443219 54 42.12, +20 58 03.3EW16.3116.95V0.4248192455516.1861Min Comm. 2020_PC-V.png20_chart.jpg20_data.txt
21 USNO-A2.0 1050-1557969219 54 45.47, +21 02 13.0SR:14.1414.39V50.8:2454727.3Max Comm. 2121_PC-V.png21_chart.jpg21_data.txt
22 USNO-A2.0 1050-1558352619 54 47.89, +20 56 43.9EW16.2916.82V0.37062454725.458Min Comm. 2222_PC-V.png22_chart.jpg22_data.txt
23 USNO-A2.0 1050-1558537019 54 49.01, +20 25 33.5EB13.5914.00V0.5914072454781.2294Min Comm. 2323_PC-V.png23_chart.jpg23_data.txt
24 USNO-A2.0 1050-1558603819 54 49.49, +20 50 40.7EW16.4717.30:V0.3457492454726.505Min Comm. 2424_PC-V.png24_chart.jpg24_data.txt
25 USNO-A2.0 1050-1558903719 54 51.23, +20 25 22.4EA13.8714.04V1.74962455515.2541Min Comm. 2525_PC-V.png25_chart.jpg25_data.txt
26 USNO-A2.0 1050-1561132719 55 05.21, +21 17 30.7HADS14.8215.06V0.0973952454726.337Max Comm. 2626_PC-V.png26_chart.jpg26_data.txt
27 USNO-A2.0 1050-1564319419 55 25.48, +20 31 37.9EW16.2216.94V0.3180812455507.549Min Comm. 2727_PC-V.png27_chart.jpg27_data.txt
28 USNO-A2.0 1050-1564595419 55 27.33, +20 54 39.6EA15.7816.57V3.20282454727.3230Min Comm. 2828_PC-V.png28_chart.jpg28_data.txt
29 USNO-A2.0 1050-1564897119 55 29.41, +21 05 34.7EW13.5314.16V0.4039692454725.3537Min Comm. 2929_PC-V.png29_chart.jpg29_data.txt
30 USNO-A2.0 1050-1565169019 55 31.21, +20 31 51.3EB15.4016.20V0.4364442454780.2127Min Comm. 3030_PC-V.png30_chart.jpg30_data.txt
31 USNO-A2.0 1050-1565426919 55 33.00, +20 41 42.9EW13.3513.57V0.3699392455518.2422Min Comm. 3131_PC-V.png31_chart.jpg31_data.txt
32 USNO-A2.0 1050-1565835919 55 35.89, +20 58 18.0HADS15.5715.95V0.0948782454727.3069Max Comm. 3232_PC-V.png32_chart.jpg32_data.txt
33 USNO-A2.0 1050-1567400119 55 47.78, +21 09 37.7EB15.9216.38V0.5633062455504.205Min Comm. 3333_PC-V.png33_chart.jpg33_data.txt
34 USNO-A2.0 1050-1567674619 55 49.99, +20 30 44.8HADS16.4416.83V0.1173802454781.292Max  34_PC-V.png34_chart.jpg34_data.txt

Comments:


2. A close pair of two stars: 2MASS 19523437+2057335 and 2MASS 19523464+2057340. The angular resulution of our telescope is insufissient to determine which of the two stars varies. MinII=14m.22.

3. Maxima:
HJD(TT)±
2454727.295 0.002
2454780.225 0.001
2454781.198 0.001
2455504.14650.0007
2455504.2470.001
2455507.26630.0009
2455511.252 0.001
2455512.22760.0007
2455515.24640.0009
2455516.21350.0003
2455518.264 0.002


4. MinII=15m.44.

5. Primary minima:
HJD(TT)±
2454727.29100.0005
2455504.20340.0006
MinII=16m.04.

6. Primary minima:
HJD(TT)±
2454781.21110.0008
2455515.21050.0008
MinII=15m.28.

7. A close pair of two stars: 2MASS 19531118+2106222 and CMC14 195310.9+210618. 2MASS 19531118+2106222 varies. Infrared source IRAS 19510+2058. Primary minima:
HJD(TT)±
2454727.28330.0005
2454781.20870.0007
2455516.23380.0010
MinII=15m.58.

8. Period 0d.685447 and type EW are also possible.

9. Primary minima:
HJD(TT)±
2454725.31410.0008
2454726.367 0.003
2454745.326 0.001
2455513.235 0.001
2455518.240 0.002
MinII=14m.95.

10. Primary minima:
HJD(TT)±
2455516.18030.0009
2455518.24400.0006
MinII=13m.79.

12. Period 0d.471026 is also possible. Primary minimum: HJD(TT) 2454726.3707 ± 0.0008. MinII=14m.32.

13. MinII=14m.65.

14. Primary minimum: HJD(TT) 2454727.2950 ± 0.0007.

15. A close pair of two stars: USNO-A2.0 1050-15548930 and 2MASS 19542631+2034125. USNO-A2.0 1050-15548930 varies. MinII=15m.42.

16. Period 0d.267441 is also possible. MinII=17m.17.

17. Infrared colors J–H=0.984, H–K=0.307 and J–K=1.291 (2MASS) are consistent with M spectral type (Bessell and Brett 1988) and SR: classification.

18. Primary minimum: HJD(TT) 2455516.2329 ± 0.0007. MinII=15m.94.

19. Period 0d.269786 is also possible. MinII=16m.45.

20. Primary minimum: HJD(TT) 2455516.1861 ± 0.0008. MinII=16m.86.

21. Infrared colors J–H=1.035, H–K=0.384 and J–K=1.419 (2MASS) are consistent with M spectral type (Bessell and Brett 1988) and SR: classification.

22. Period 0d.3098 is also possible. MinII=16m.62.

23. A close pair of two stars: 2MASS 19544900+2025324 and 2MASS 19544893+2025359. The angular resulution of our telescope is insufissient to determine which of the two stars varies. Primary minima:
HJD(TT)±
2454781.22940.0004
2455509.25220.0008
MinII=13m.78.

24. Periods 0d.418246 or 0d.294669 are possible. MinII=17m.27.

25. A close pair of two stars: USNO-A2.0 1050-15589037 and a faint star, not found in any catalogues. USNO-A2.0 1050-15589037 varies. Primary minimum: HJD(TT) 2455515.2541 ± 0.0007. MinII=14m.02:.

26. Maxima:
HJD(TT)±
2454726.337 0.003
2454727.307 0.002
2454745.329 0.001
2454779.220 0.001


27. Period 0d.274336 is possible. MinII=16m.86:.

28. A close pair of two stars: USNO-A2.0 1050-15645954 and a faint star, not found in any catalogues. USNO-A2.0 1050-15645954 varies. Period 1d.60142 is possible. Primary minima:
HJD(TT)±
2454727.32300.0008
2455515.220 0.002
MinII=16m.46.

29. The shape of the light curve for observations intervals JD 2454725–2454788 and JD 2455504–2455518 is different: we found change of the depth of primary and secondary minima. Primary minima:
HJD(TT)±
2454725.35370.0006
2454727.37330.0004
2455504.20630.0002
2455512.28410.0002
MinII=13m.99.

30. Primary minima:
HJD(TT)±
2454780.21270.0004
2455511.25640.0005
2455518.23980.0006
MinII=15m.68.

31. Primary minima:
HJD(TT)±
2454727.31450.0009
2454780.21730.0004
2455504.18240.0003
2455518.24220.0003
MinII=13m.57.

32. Period 0d.086636 is also possible. Maxima:
HJD(TT)±
2454725.31860.0009
2454726.359 0.001
2454727.30690.0005
2454745.33590.0006
2454779.20800.0004
2454780.25200.0008
2454781.19700.0005
2455504.16980.0009
2455504.262 0.001
2455507.29610.0005
2455512.233 0.001
2455515.26770.0009
2455516.2190.001
2455518.20940.0007


33. Primary minimum: HJD(TT) 2455504.205 ± 0.001. MinII=16m.20.

Remarks:
During observations of the field of Nova V458 Vul, we discovered 34 new variable stars. Our observations were carried out at the Astrotel-Caucasus observatory, located at the Astronomical station of the Kazan Federal university, using the 300-mm Ritchey–Chretien telescope, equipped with Apogee Alta U9000 CCD camera with Johnson–Cousins V filter. A total of 619 images with 5-minute exposures were obtained on JD 2454725 – 2455518. For basic reductions for dark current, flat fields, bias, and for removing cosmic rays hits we used IRAF routines. For search and photometry of new variable stars, we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star was USNO-A2.0 1050-15501592 (α = 19h53m57s.35, δ = +20°52′ 11″.5, J2000; 2MASS); V = 11m.99 from the FONAC catalogue (Kislyuk et al. 1999). The coordinates of the variable stars in the Table were drawn from the 2MASS catalogue (Skrutskie et al. 2006) except for the stars USNO-A2.0 1050-15373852 and USNO-A2.0 1050-15585370; their coordinates were drawn from the USNO-A2.0 catalogue (Monet et al. 1998). All times in the Table and Comments are expressed in the Terrestrial Time in accordance with IAU recommendations (resolution B1 XXIII IAU GA). For search for periods and epochs of extrema we use Peranso software.

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

References:
Bessell, M.S., Brett, J.M., 1988, PASP, 100, 1134
Kislyuk, V., Yatsenko, A., Ivanov, G., et al., 1999, The FON Astrographic Catalogue (FONAC), Centre de Donnees Astronomiques de Strasbourg, I/261
Monet, D., Bird, A., Canzian, B., et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards (U.S. Naval Observatory, Washington, DC), Centre de Donnees Astronomiques de Strasbourg, I/252
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, AJ, 131, 1163
Sokolovsky, K., Lebedev, A., 2005, in 12th Young Scientists' Conference on Astronomy and Space Physics, Kyiv, Ukraine, April 1923, 2005, eds.: Simon, A.; Golovin, A., p.79



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