Peremennye Zvezdy (Variable Stars) 35, No. 1, 2015 Received 29 January; accepted 11 February.
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Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia; e-mail: khruslov@bk.ru
We present a new study of 56 known RR Lyrae variable stars from the Catalina surveys periodic variable star catalog. We analyzed all observations available for these stars in the Catalina Surveys and SuperWASP online public archives using the period-search software developed by Dr. V.P. Goranskij for Windows environment. According to these data, the stars are double-mode RR Lyrae variables, pulsating in the first-overtone and fundamental modes. |
I studied 56 known RR Lyrae variable stars from the Catalina surveys periodic variable star catalog (Drake et al. 2014), analyzing all observations available for them in the Catalina Surveys (Drake et al. 2009) and SuperWASP (Butters et al. 2010) online public archives using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The SuperWASP observations are available as FITS tables, which were converted into ASCII tables using the OMC2ASCII program as described by Sokolovsky (2007). In the Catalina surveys periodic variable star catalog, all these variables are designated as RRC stars. Our analysis of the available data demonstrates that the variables are double-mode RR Lyrae variables, pulsating in the first-overtone and fundamental modes.
Light curves, finding charts, and data (CSS, SSS, MLS, 1SWASP) are available online in the html version of this paper as a zip-archive. The light curves are given in the format displayed in Fig. 1. Top panels present data folded with the fundamental-mode and first-overtone periods. Bottom panels show the same curves after prewhitening the other oscillation (if the frequencies and were excluded, it is also noted). These light curves are given for all data series.
Along with the light curves, we present power spectra of the RR Lyrae variables, for the raw data and after subtraction of the first-overtone (or fundamental mode) oscillations, as shown in Fig. 2. The structure of the power spectra shows that the secondary periods are real.
The stars' period ratios, , are typical of radially pulsating double-mode RR Lyrae stars. The Petersen diagram for double-mode RR Lyrae variables from this paper is displayed in Fig. 3.
In five cases, the periods presented in the Catalina surveys periodic variable star catalog are wrong. For Nos. 18, 28, and 56, the catalog period is a one-day alias of the real first overtone period; for Nos. 12 and 29, the catalog period is a one-day alias of the real fundamental mode period.
Information on the studied stars is presented in Tables 1-4. Table 1 contains numbers from the GSC and USNO-B1.0 catalogs; equatorial coordinates (J2000); magnitude at maximum and minimum in the Catalina surveys photometric system; period previously known for the star, according to the Catalina surveys periodic variable star catalog. Asterisks mark the presence of additional information on the star, as explained in Comments. The tabulated coordinates of the variables were drawn from either the GSC2.3 (Lasker et al. 2008) or 2MASS (Skrutskie et al. 2006) catalogs.
No. | Name | Coordinates (J2000) | CSS mag | , days |
1 | USNO-B1.0 1201-0009113 | 0039 3838 +300940 8 | 16.91-17.67 | 03951946 |
2 | GSC 1206-01674 | 01 53 42.59 +15 52 15.6 | 14.64-15.19 | 0.4205069 |
3 | USNO-B1.0 1155-0026482 | 02 15 54.78 +25 34 39.6 | 15.71-16.48 | 0.357762 |
4 | USNO-B1.0 1012-0025337 | 02 48 18.04 +11 12 40.5 | 15.94-16.65 | 0.418635 |
5 | USNO-B1.0 1538-0156471 | 07 01 44.47 +63 53 02.7 | 15.98-16.57 | 0.3566511 |
6 | USNO-B1.0 1021-0178560 | 08 09 35.30 +12 09 00.3 | 16.55-17.33 | 0.3713580 |
7 | USBO-B1.0 1211-0158004* | 08 14 29.85 +31 11 15.3 | 16.86-17.60 | 0.3508887 |
8 | USNO-B1.0 0994-0170746 | 08 16 52.42 +09 27 56.7 | 16.47-17.29 | 0.3582525 |
9 | USNO-B1.0 1087-0165074 | 08 24 26.28 +18 42 28.7 | 16.51-17.38 | 0.3765145 |
10 | USNO-B1.0 1142-0160444 | 08 45 29.36 +24 16 31.2 | 17.55-18.47 | 0.3597362 |
11 | USN0-B1.0 0998-0182783 | 08 48 38.26 +09 51 14.9 | 16.73-17.48 | 0.3560988 |
12 | USNO-B1.0 0995-0182765 | 08 52 13.29 +09 32 16.1 | 18.1-19.0 | 0.3281944 |
13 | USNO-B1.0 1265-0169434* | 08 58 09.48 +36 31 21.4 | 16.61-17.44 | 0.3558720 |
14 | USNO-B1.0 0971-0212517 | 09 16 37.72 +07 11 25.3 | 16.55-17.30 | 0.404839 |
15 | USNO-B1.0 1061-0174839 | 09 43 11.02 +16 09 53.5 | 16.70-17.49 | 0.3791779 |
16 | USNO-B1.0 1083-0199119 | 09 55 44.88 +18 23 07.8 | 16.54-17.37 | 0.3753066 |
17 | USNO-B1.0 1220-0203005 | 09 57 25.89 +32 01 17.6 | 17.51-18.31 | 0.3889338 |
18 | USNO-B1.0 1119-0202036 | 10 06 44.06 +21 56 59.4 | 17.5-18.4 | 0.283598 |
19 | USNO-B1.0 0903-0190606 | 10 23 08.54 +00 23 30.4 | 18.4-19.3 | 0.354036 |
20 | USNO-B1.0 1059-0190499 | 10 23 47.66 +15 59 12.3 | 17.3-18.1 | 0.3745709 |
21 | USNO-B1.0 1326-0262115 | 10 24 57.50 +42 40 22.2 | 17.02-17.73 | 0.4086693 |
22 | USNO-B1.0 0972-0231646 | 10 34 06.66 +07 12 07.9 | 17.40-18.25 | 0.3504379 |
23 | USNO-B1.0 0875-0290446 | 10 42 07.92 -02 29 56.8 | 17.11-17.91 | 0.4200851 |
24 | USNO-B1.0 0866-0219758 | 10 44 18.73 -03 18 50.9 | 16.79-17.68 | 0.3636318 |
25 | USNO-B1.0 1076-0231367 | 11 03 51.80 +17 36 09.9 | 17.58-18.49 | 0.358411 |
26 | USNO-B1.0 1139-0181861 | 11 16 44.95 +23 59 28.2 | 17.50-18.44 | 0.4130053 |
27 | USNO-B1.0 1072-0234586 | 11 19 22.51 +17 13 23.7 | 16.87-17.60 | 0.3646734 |
28 | USNO-B1.0 0877-0319036 | 11 28 45.50 -02 16 00.7 | 17.2-18.1 | 0.2570875 |
29 | USNO-B1.0 1129-0228008 | 11 33 27.98 +22 59 21.5 | 16.81-17.62 | 0.324888 |
30 | USNO-B1.0 1075-0239855 | 11 45 17.70 +17 31 16.1 | 16.91-17.64 | 0.40805 |
31 | USNO-B1.0 1038-0192883 | 11 46 31.44 +13 51 59.4 | 17.39-18.33 | 0.3511538 |
32 | USNO-B1.0 0783-0261258 | 12 12 50.62 -11 39 08.5 | 16.80-17.55 | 0.3614389 |
33 | GSC 5533-00078 | 12 27 26.34 -13 00 28.3 | 15.19-15.75 | 0.3642299 |
34 | USNO-B1.0 1005-0208522 | 12 38 15.56 +10 35 31.3 | 17.34-18.31 | 0.3700176 |
35 | USNO-B1.0 0997-0233324* | 12 53 47.39 +09 43 09.1 | 15.66-16.24 | 0.3690403 |
36 | USNO-B1.0 1041-0224476 | 13 08 47.87 +14 10 12.2 | 16.75-17.51 | 0.34526 |
37 | USNO-B1.0 0990-0227417 | 13 21 53.28 +09 01 31.4 | 17.8-18.7 | 0.3547121 |
38 | USNO-B1.0 1162-0217838 | 13 23 22.11 +26 13 43.7 | 17.46-18.33 | 0.3544163 |
39 | USNO-B1.0 1244-0215132 | 14 21 58.72 +34 27 24.4 | 16.16-16.78 | 0.3564981 |
40 | USNO-B1.0 1240-0222201 | 14 44 01.00 +34 02 43.6 | 16.59-17.42 | 0.4070824 |
41 | USNO-B1.0 1247-0222564 | 15 03 58.26 +34 46 47.4 | 17.02-17.87 | 0.357288 |
42 | USNO-B1.0 0965-0243978* | 15 08 17.61 +06 32 13.2 | 16.82-17.46 | 0.4119803 |
43 | USNO-B1.0 1308-0273169 | 16 46 47.65 +40 51 16.5 | 16.40-17.08 | 0.3739999 |
44 | USNO-B1.0 1147-0245047 | 16 48 59.11 +24 43 55.6 | 16.53-17.21 | 0.4011456 |
No. | Name | Coordinates (J2000) | CSS magn. | , days |
45 | USNO-B1.0 1116-0277997 | 16 57 09.73 +21 40 02.0 | 16.57-17.50 | 0.3648103 |
46 | USNO-B1.0 1108-0268087 | 16 57 40.31 +20 53 33.7 | 16.08-16.65 | 0.3744385 |
47 | USNO-B1.0 1057-0629220 | 21 48 53.46 +15 45 20.6 | 17.66-18.49 | 0.3558251 |
48 | USNO-B1.0 1035-0607825 | 21 56 54.02 +13 31 24.7 | 16.13-16.70 | 0.406222 |
49 | USNO-B1.0 1063-0609449 | 22 17 47.44 +16 19 29.8 | 17.21-17.98 | 0.4070613 |
50 | GSC2.3 N09A000095* | 22 27 17.66 +25 20 08.4 | 14.66-15.13 | 0.402694 |
51 | USNO-B1.0 1016-0656702* | 22 34 30.58 +11 39 12.6 | 16.81-17.43 | 0.3888151 |
52 | USNO-B1.0 1233-0612339* | 22 40 00.25 +33 22 37.6 | 14.51-15.11 | 0.357745 |
53 | USNO-B1.0 1092-0590255 | 22 43 20.23 +19 14 33.1 | 16.58-17.32 | 0.35608 |
54 | USNO-B1.0 1161-0575560 | 22 51 17.35 +26 10 54.5 | 17.10-17.75 | 0.3715164 |
55 | USNO-B1.0 0989-0604703 | 22 55 42.42 +08 59 36.2 | 15.41-16.07 | 0.3492836 |
56 | GSC 2255-01669* | 23 49 00.58 +27 03 16.4 | 13.62-14.29 | 0.2682041 |
Light elements of all oscillations: the first-overtone period , fundamental period , first-overtone and fundamental mode epoch of maxima, period ratio , periods of the frequencies () and () are collected in Table 2.
No. | , d | , d | Epoch, JD | Epoch, JD | , d | , d | |
1 | 0.395196 | 0.529664 | 2455000.332 | 2455000.237 | 0.7461 | - | - |
2 | 0.420513 | 0.564048 | 2455000.275 | 2455000.250 | 0.7455 | 0.240908 | - |
3 | 0.357769 | 0.480781 | 2455000.023 | 2455000.148 | 0.7441 | 0.2051257 | 1.39816 |
4 | 0.418642 | 0.561570 | 2455000.406 | 2455000.035 | 0.7455 | 0.2398406 | 1.6450 |
5 | 0.356657 | 0.479216 | 2455000.248 | 2455000.414 | 0.7443 | - | - |
6 | 0.371362 | 0.498566 | 2455000.240 | 2455000.335 | 0.7449 | 0.212834 | 1.45553 |
7 | 0.350894 | 0.472146 | 2455000.542 | 2455000.636 | 0.7432 | 0.201293 | - |
8 | 0.358253 | 0.481136 | 2455000.062 | 2455000.200 | 0.7446 | 0.205350 | 1.40272 |
9 | 0.376512 | 0.505835 | 2455000.245 | 2455000.107 | 0.7443 | 0.215849 | 1.47280 |
10 | 0.359741 | 0.482865 | 2455000.095 | 2455000.370 | 0.7450 | - | - |
11 | 0.356102 | 0.478487 | 2455000.337 | 2455000.235 | 0.7442 | - | - |
12 | 0.364073 | 0.489181 | 2455000.358 | 2455000.336 | 0.7443 | 0.20873 | 1.4234 |
13 | 0.355872 | 0.478181 | 2455000.037 | 2455000.374 | 0.7442 | 0.204029 | 1.3912 |
14 | 0.404849 | 0.542956 | 2455000.070 | 2455000.087 | 0.7456 | 0.231921 | 1.59165 |
15 | 0.379178 | 0.509437 | 2455000.256 | 2455000.007 | 0.7443 | 0.217380 | 1.48303 |
16 | 0.375307 | 0.503529 | 2455000.277 | 2455000.423 | 0.7454 | 0.215033 | 1.47384 |
17 | 0.388921 | 0.521624 | 2455000.140 | 2455000.023 | 0.7456 | - | - |
No. | , d | , d | Epoch, JD | Epoch, JD | , d | , d | |
18 | 0.395859 | 0.530969 | 2455000.092 | 2455000.210 | 0.7455 | 0.226780 | 1.55578 |
19 | 0.354037 | 0.475673 | 2455000.165 | 2455000.205 | 0.7443 | - | - |
20 | 0.374572 | 0.502380 | 2455000.260 | 2455000.287 | 0.7456 | - | - |
21 | 0.408675 | 0.548171 | 2455000.454 | 2455000.486 | 0.7455 | 0.234125 | - |
22 | 0.350447 | 0.471002 | 2455000.082 | 2455000.224 | 0.7440 | 0.200940 |