Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 12, N 5 (2012)

Thirteen New Variable Stars in the Catalina Surveys Data Release 1

S. V. Antipin
Sternberg Astronomical Institute, Lomonosov Moscow State University, and Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia

Received:   13.03.2012;   accepted:   27.03.2012
(E-mail for contact: antipin@sai.msu.ru)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 GSC 2038-0133316 02 08.01, +27 03 32.2RRAB14.6015.34 0.6788882453560.7430max  lc1.jpgfch1.jpgdata1.txt
2 GSC 2050-0047516 16 28.35, +27 52 01.6RRAB13.7514.03 0.8280842454567.9836max  lc2.jpgfch2.jpgdata2.txt
3 USNO-B1.0 1265-024356116 22 58.89, +36 34 24.3RRC15.0515.48 0.36942455089.68max Comm. 3lc3.jpgfch3.jpgdata3.txt
4 USNO-B1.0 1320-031925216 26 34.20, +42 04 57.1RRAB14.6515.70 0.5083162454943.9381max  lc4.jpgfch4.jpgdata4.txt
5 USNO-B1.0 1296-027606016 31 22.64, +39 38 11.4RRC15.4015.97 0.3415322454279.8270max Comm. 5lc5.jpgfch5.jpgdata5.txt
6 USNO-B1.0 1297-028028316 31 37.52, +39 47 35.3RRAB15.3516.60 0.4653452454295.7942max  lc6.jpgfch6.jpgdata6.txt
7 GSC 3063-0004716 31 58.88, +38 45 38.7RRC13.7914.20 0.3642242454239.8728max Comm. 7lc7.jpgfch7.jpgdata7.txt
8 GSC 3078-0045516 47 39.42, +43 04 34.3EA13.8214.77 0.5993492455714.845min Comm. 8lc8.jpgfch8.jpgdata8.txt
9 USNO-B1.0 1306-027094916 52 49.92, +40 36 03.3RRAB16.2017.25 0.6129782454385.6150max  lc9.jpgfch9.jpgdata9.txt
10 GSC 2601-0009216 55 48.50, +35 49 43.2EA13.314.0 4.976352451453.665min Comm. 10lc10.jpgfch10.jpgdata10.txt
11 USNO-B1.0 1258-025007416 56 00.19, +35 50 41.0RRAB15.7016.73 0.5111792455043.7204max  lc11.jpgfch11.jpgdata11.txt
12 USNO-B1.0 1258-025204717 03 02.21, +35 51 25.9RRAB15.0616.10 0.6086712454996.8756max  lc12.jpgfch12.jpgdata12.txt
13 USNO-B1.0 1316-029040917 03 56.83, +41 36 41.8RRAB15.8717.03 0.5215202454531.9845max Comm. 13lc13.jpgfch13.jpgdata13.txt

Comments:


3. Strong period changes. Two additional phased light curves for narrow JD intervals are presented in the Figure (lc3.jpg).

5. Period changes.

7. Period changes.

8. MinII = 14.38.

10. An Algol-subtype eclipsing variable with narrow minima (D ~ 0.03). The minima from plates of Moscow collection, ROTSE-I/NSVS database (Wozniak et al. 2004), and Catalina Sky Surveys were combined to determine the orbital period with higher precision. The NSVS and Moscow photographic data shows presence of a secondary minimum shifted from the phase 0.5 (orbital eccentricity). The phases of the secondary minima are 0.454 and 0.464 (Moscow plates) and 0.453 (NSVS data).
Minima: minima
HJD Min Source
2441804.515 I Moscow plate archive
2441829.353 I Moscow plate archive
2442364.184 II Moscow plate archive
2442369.160 II Moscow plate archive
2442869.471 I Moscow plate archive
2445882.411 II Moscow plate archive
2451286.721 II ROTSE-I/NSVS
2451453.665 I ROTSE-I/NSVS
2451463.659 I ROTSE-I/NSVS
2454548.942 I Catalina Surveys


13. Blazhko effect.

Remarks:
In the mid-1990s, I performed a search for new variable stars using plates of the Moscow collection in two fields centered at η Herculis and ξ Coronae Borealis (e.g., Antipin 1996a, Antipin 1996b). Some of the discovered variables could not be investigated at that time. A recent inspection of this old list of discoveries shows that thirteen objects still remained not announced as variable stars till present.

The new possibility of using the online photometry of the Catalina Surveys Data Release 1 (Drake et al. 2009) has allowed me to investigate the earlier suspected stars, to derive their light elements and variability types. A small number of bad data points that deviate strongly from the phased light curves were rejected from the analysis.

Surprisingly, all RRC-type stars in the sample indicate noticeable periods changes, while the RRAB-type stars show stable phased light curves.

The WinEfk software developed by Dr. V.P. Goranskij was used to search for periodicity. The coordinates in the Table are from the 2MASS catalog (Skrutskie et al. 2006).

Acknowledgements: This study was supported, in part, by the Russian Foundation for Basic Research through grant No. 11-02-00495. The CSS survey is funded by the National Aeronautics and Space Administration under Grant No. NNG05GF22G issued through the Science Mission Directorate Near-Earth Objects Observations Program. The CRTS survey is supported by the U.S. National Science Foundation under grants AST-0909182.

References:
Antipin, S.V., 1996a, Inform. Bull. Var. Stars, No. 4343
Antipin, S.V., 1996b, Inform. Bull. Var. Stars, No. 4360
Drake, A.J., Djorgovski, S.G., Mahabal, A., et al., 2009, Astrophys. J., 696, 870
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, Astron. J., 131, 1163
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W., et al., 2004, Astron. J., 127, 2436



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