Article in PDF |
"Peremennye Zvezdy", Prilozhenie, vol. 13, N 5 (2013) |
ISSN 2221–0474 |
Received: 9.12.2012; accepted: 5.03.2013
(E-mail for contact: khruslov@bk.ru)
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Comments:
1. D = 0.17 P. MinII = 10m.81: (SWASP). Combined brightness of three stars, TYC 2798 01443 1 (= var), TYC 2798 00986 1, and GSC 2798-01302 was measured in the NSVS and SWASP, making the corresponding amplitudes much too low. The ROTSE data with photometric correction flags were kept for the analysis. I identify variability with TYC 2798 01443 1 because, in the 1SWASP survey, the object 1SWASP J005617.23+381059.5 that corresponds to TYC 2798 01443 1 has the largest amplitude compared to the 1SWASP objects corresponding to the two neighbors.
2. MinII = 10m.44: (SWASP). Combined brightness of two stars, TYC 2798 01339 1 (= var) and TYC 2798 01223 1, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are much too low. The amplitude of the 1SWASP object that corresponds to the variable considerably exceeds the amplitude of its 1SWASP neighbor.
3. MinII = 13m.75 (CV). Combined brightness of two stars, GSC 2300-00373 (= var) and GSC 2300-00471, is presented in the NSVS and SWASP data, and thus the corresponding amplitudes are considerably too low.
4. D = 0.16 P. MinII = 13m.33 (CV). Combined brightness of two stars, GSC 2818-00032 (= var) and GSC 2818-00315, is presented in the NSVS and SWASP data, and thus the corresponding amplitudes are considerably too low.
5. MinII = 14m.08 (CV). Combined brightness of two stars, GSC 2298-01220 (= var) and a fainter one, GSC 2298-00996, was measured in the NSVS and SWASP; the corresponding amplitudes are somewhat too low. The light elements from the NSVS data are: JD(min) = 2451480.623 + 0.3084×E. The ROTSE data with photometric correction flags were kept for the analysis.
6. MinII = 13m.98 (CV). Combined brightness of two stars, GSC 2829-01342 (= var) and GSC 2829-01108, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are considerably too low.
7. MinII = 13m.70 (CV). From the 1SWASP data, 13.72–14.09, MinII = 14m.07. The ROTSE data with photometric correction flags were kept for the analysis.
8. Combined brightness of two stars, GSC 2328-00100 (= var) and TYC 2328 00104 1, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are considerably too low.
9. MinII = 14m.21 (CV). Combined brightness of two stars, GSC 2846-00631 (= var) and the fainter USNO-A2.0 1275-01820135, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are somewhat too low. The ROTSE data with photometric correction flags were kept for the analysis.
10. From the ROTSE-I/NSVS data, 13.6–14.0, MinII = 13m.95 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
11. D = 0.04 P. From the ROTSE-I/NSVS data, 11.05–11.30 in the R band.
12. MinII = 10m.99 (SWASP). From the ROTSE-I/NSVS data, 10.97&ndash11.06, MinII = 11m.04 in the R band.
13. Double wave. 12.15–12.35 in the R band from the ROTSE-I/NSVS data. According to NSVS data, the elements are: JD(max) = 2451400.730 + 0.29053×E. 1RXS J142610.2+461601. B–V = 1.447 (Tycho2), J–H = 0.619 (2MASS). A star with a considerable proper motion (in the Tycho-2 catalog, pmRA (mas/yr) = 93.2; pmDec (mas/yr) = –77.7).
14. MinII = 14m.05 (CV). From the 1SWASP data, 13.9–14.2; from the ROTSE-I/NSVS data, 14.0–14.3 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
15. D = 0.16: P. Combined brightness of two stars, GSC 4183-01034 (= var) and the brighter one, GSC 4183-00077, was measured in the NSVS, and thus the corresponding amplitude is much too low.
16. D = 0.15 P. MinII = 13m.00 (CV). From the ROTSE-I/NSVS data, 13.15–13.65, MinII = 13m.25 in the R band.
17. D = 0.09 P. MinII = 13m.1 (R). From the Catalina surveys data, 12.9–13.2 in the CV band.
18. D = 0.08 P. MinII = 14m.61: (CV). Combined brightness of two stars, GSC 3060-01565 (= var) and GSC 3060-01095, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are much too low. The ROTSE data with photometric correction flags were kept for the analysis.
19. MinII = 13m.67 (CV). Combined brightness of two stars, GSC 3490-01506 (= var) and GSC 3490-00874, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are considearbly too low. The ROTSE data with photometric correction flags were kept for the analysis.
20. MinII = 14m.74 (CV). According to NSVS data, the light elements are: JD(min) = 2451400.572: + 0.28974×E.
21. MinII = 13m.41 (CV). Only data for JD 2454297 were taken from the SWASP data; the rest of the data have poor quality and large scatter. According to NSVS data, the light elements are: JD(min) = 2451450.850 + 0.3803×E. The ROTSE data with photometric correction flags were kept for the analysis.
22. MinII = 13m.92 (CV). From the ROTSE-I/NSVS data, 13.55–13.75 in the R band. The NSVS probably presents combined brightness for two stars, GSC 4192-02354 (= var) and GSC 4192-01340, thus the corresponding amplitude is somewhat too low.
23. MinII = 13m.50 (CV). From the 1SWASP data, 13.48–13.78, MinII = 13m.74; from the ROTSE-I/NSVS data, 13.5–13.9, MinII = 13m.85 in the R band. According to NSVS data, the light elements are: JD(min) = 2451400.680 + 0.35469×E.
24. M–m = 0.17 P. J–H = 0.310 (2MASS).
25. From the ROTSE-I/NSVS data, 14.3–15.0 in the R band. J–H = 0.026 (2MASS).
26. MinII = 14m.50 (CV). From the 1SWASP data, 14.42–14.82, MinII = 14m.79; from the ROTSE-I/NSVS data, 14.25–14.6 in the R band . According to NSVS data, the light elements are: JD(min) = 2451400.528 + 0.28685×E. The ROTSE data with photometric correction flags were kept for the analysis.
27. MinII = 14m.60 (CV). From the ROTSE-I/NSVS data, 14.3–14.8 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
28. Combined brightness of three stars: GSC 3899-00384 (= var), GSC 3899-01237, and GSC 3899-00288 was measured in the NSVS and 1SWASP data, the corresponding amplitudes are too low. 1RXS J171519.4+582840.
29. Combined brightness of two stars, GSC 4206-00007 (= var) and GSC 4206-00584, was measured in the NSVS, and thus the corresponding amplitude is too low. The minima are of the same depth. The ROTSE data with photometric correction flags were kept for the analysis.
30. MinII = 14m.73 (CV). Combined brightness of two stars, USNO-A2.0 1200-08587296 (= var) and GSC 2611-00682, was measured in the NSVS and 1SWASP, the corresponding amplitudes are somewhat too low. The ROTSE data with photometric correction flags were kept for the analysis.
31. M–m = 0.39 P. Combined brightness of two stars, TYC 2634 00567 1 (= var) and GSC 2634-00427, was measured in the NSVS and 1SWASP, thus the corresponding amplitudes are considerably too low. J–H = 0.125 (2MASS), B–V = 0.223 (Tycho2).
32. MinII = 13m.79 (CV). Combined brightness of two stars, GSC 2748-01569 and GSC 2748-01141, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are somewhat too low. The ROTSE data with photometric correction flags were kept for the analysis.
33. MinII = 13m.47 (CV). From the 1SWASP data, 13.33–13.69, MinII = 13m.65; from the RORSE-I/NSVS dat, 13.3–13.7 in the R band. The ROTSE data with photometric correction flags were kept for the analysis. The star has a faint close companion GSC 3214-00529.
34. The depth of MinII varies in the CSS data. From the 1SWASP data, 14.12–14.38, MinII = 14m.35; from the ROTSE-I/NSVS data, 13.95–14.3 in the R band. According to NSVS data, the light elements are: JD(min) = 2451460.502 + 0.39339×E.
35. According to CSS data, the system's mean brightness varies. Combined brightness of two stars, GSC 2755-00120 (= var) and USNO-A2.0 1200-19695639, was measured in the NSVS and SWASP, and thus the corresponding amplitudes are somewhat too low.
36. According to 1SWASP, the minima have the same depth. From the 1SWASP data, 13.25–13.50 from the 1SWASP data; from the ROTSE-I/NSVS data, 13.4–13.65 in the R band. The star has a faint close companion GSC 3221-00976.
37. MinII = 14m.30 (CV). From the 1SWASP data, 14.3–14.65. According to NSVS data, the light elements are: JD(min) = 2451440.598 + 0.34027×E.
38. MinII = 13m.25 (SWASP). From the Catalina surveys data, 12.84–12.98, MinII = 12m.95 in the CV band. From the ROTSE-I/NSVS data, 13.31–13.42, MinII = 13m.38 in the R band.Remarks:
I present a discovery of 38 new variable stars. My search for variables was carried out in the publicly available data of the Northern Sky Variability Survey (NSVS , Wozniak et al. 2004). Besides, to improve classification and light element, I analyzed all available observations of these stars from the Catalina Surveys (Drake et al. 2009) and SuperWASP (Butters et al. 2010).
Many of the variables presented in this paper are close visual pairs that cannot be separated with the low resolution of the surveys like NSVS or 1SWASP. Data from the Catalina surveys, which have resolution as good as 1–2 arcseconds, provide a possibility to solve this problem. In these cases, combined brightness of several stars was measured in the NSVS and 1SWASP, so that the resulting amplitude is too low and the variable's mean brightness appears much higher than in reality; for this reason, only CV (Catalina) magnitudes are tabulated for such stars. In our analysis of 1SWASP data, nights with a large scatter of data points around the light curve were disregarded.
These observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The coordinates were drawn either from the Tycho-2 or from the 2MASS catalogs.
The SuperWASP observations are available as FITS tables, which were converted into ASCII tables using the OMC2ASCII program as described by Sokolovsky (2007).
Acknowledgements: Thanks are due to Dr. K.V. Sokolovsky for his advice concerning data retrieving. The author wishes to thank Dr. V.P. Goranskij for providing his software.References:
Butters, O.W., West, R.G., Anderson, D.R., et al., 2010, Astron. and Astrophys., 520, L10
Drake, A.J., Djorgovski, S.G., Mahabal, A., et al., 2009, Astrophys. J., 696, 870
Sokolovsky, K.V., 2007, Perem. Zvezdy Prilozh., 7, No. 30
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W., et al., 2004, Astron. J., 127, 2436