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The Clusters AgeS Experiment (CASE). |
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Kaluzny, J.; Thompson, I. B.; Narloch, W.; Pych, W.; Rozyczka, M. |
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Abstract:
The field of the globular cluster M12 (NGC 6218) was monitored between 1995 and 2009 in a search for variable stars. BV light curves were obtained for thirty-six periodic or likely periodic variable stars. Thirty-four of these are new detections. Among the latter we identified twenty proper-motion members of the cluster: six detached or semi-detached eclipsing binaries, five contact binaries, five SX Phe pulsators, and three yellow stragglers. Two of the eclipsing binaries are located in the turnoff region, one on the lower main sequence and the remaining three among the blue stragglers. Two contact systems are blue stragglers, and the remaining three reside in the turnoff region. In the blue straggler region a total of 103 objects were found, of which 42 are proper motion members of M12, and another four are field stars. 55 of the remaining objects are located within two core radii from the center of the cluster, and as such they are likely genuine blue stragglers. We also report the discoveries of a radial color gradient of M12, and the shortest period among contact systems in globular clusters in general. |
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| The paper (PDF) |
"The Clusters AgeS Experiment (CASE).
Variable Stars in the Field of the Globular Cluster M12" Kaluzny, J.; Thompson, I. B.; Narloch, W.; Pych, W.; Rozyczka, M.; 2015, Acta Astronomica, vol 65, no 3, p. 267-282 |
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The reference V-band image (FITS) From 1-m Swope telescope. Astrometric solution in the header. |
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The reference V-band image (FITS) From 2.5-m duPont telescope. |
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| Star | RA [2000] | Decl. [2000] | Period [days] | Vmax | B-V | ΔV | PMa | Typeb | V light-curvec | B light-curvec | Remarks | |
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| V01 | 16:47:23 | -1:55:36 | 0.243185 | 18.93 | 0.72 | 0.25 | Y | EW | V01.ph | - | ||
| V02 | 16:47:33 | -2:03:10 | 0.252125 | 18.31 | 1.18 | 0.12 | N | EW | V02.ph | - | ||
| V03 | 16:47:13 | -1:57:26 | 0.210636 | 17.86 | 0.72 | 0.08 | Y | EW | V03.ph | - | ||
| V04 | 16:47:37 | -1:54:53 | 0.233990 | 19.45 | 1.18 | 0.46 | N | EW | V04.ph | - | ||
| V05 | 16:47:10 | -1:56:10 | 0.225502 | 18.71 | 0.67 | 0.13 | U | EW | V05.ph | - | ||
| V06 | 16:47:21 | -1:54:53 | 0.256196 | 18.80 | 0.74 | 0.34 | Y | EW | V06.ph | - | ||
| V07 | 16:46:55 | -1:59:26 | 0.257078 | 16.65 | 1.06 | 0.07 | N | EW | V07.ph | - | ||
| V08 | 16:47:21 | -1:57:24 | 0.435135 | 16.48 | 0.35 | 0.07 | Y | EW/Ell,BS | V08.ph | - | ||
| V09 | 16:47:17 | -1:56:31 | 0.444540 | 17.12 | 0.77 | 0.03 | U | EW/Ell | V09.ph | - | ||
| V10 | 16:47:05 | -1:59:36 | 4.595098 | 19.06 | 0.71 | 0.34 | Y | EA | V10.ph | - | ||
| V11 | 16:47:15 | -1:57:06 | 5.218589 | 18.26 | 0.72 | 0.36 | Y | EA | V11.ph | - | ||
| V12 | 16:47:17 | -1:55:43 | 1.025114 | 16.09 | 0.37 | 0.10 | Y | EA,BS | V12.ph | - | ||
| V13 | 16:47:15 | -1:56:45 | 0.734141 | 17.07 | 0.47 | 0.26 | Y | EA,BS | V13.ph | - | ||
| V14 | 16:47:14 | -1:57:02 | 0.463846 | 17.58 | 0.54 | 0.62 | Y | EA/EB,BS | V14.ph | - | ||
| V15 | 16:47:14 | -1:56:28 | 0.541709 | 17.13 | 0.38 | 0.16 | U | EA,BS | V15.ph | - | ||
| V16 | 16:47:29 | -1:55:36 | 2.500325 | 17.30 | 0.83 | 0.45 | N | EA | V16.ph | - | ||
| V17 | 16:47:20 | -1:51:58 | 2.279741 | 20.00 | 1.30 | 0.82 | U | EA | V17.ph | - | ||
| V18 | 16:46:52 | -1:57:34 | 17.47090 | 16.46 | 0.90 | 0.65 | N | EA | V18.ph | - | ||
| V19 | 16:46:56 | -2:00:33 | - | 19.64 | 0.83 | 0.97 | Y | EA | V19.ph | - | ||
| V20 | 16:47:20 | -1:57:10 | - | 19.72 | 0.75 | 0.62 | U | EA | V20.ph | - | ||
| V21 | 16:47:14 | -1:56:28 | 0.019636 | 17.11 | 0.41 | 0.06 | Y | SX,BS | V21.ph | - | ||
| V22 | 16:47:23 | -1:55:41 | 0.034364 | 17.25 | 0.46 | 0.05 | Y | SX,BS | V22.ph | - | ||
| V23 | 16:47:17 | -1:57:42 | 0.044294 | 16.70 | 0.41 | 0.08 | Y | SX,BS | V23.ph | - | ||
| V24 | 16:47:14 | -1:53:52 | 0.045042 | 17.20 | 0.48 | 0.08 | Y | SX,BS | V24.ph | - | ||
| V25 | 16:47:03 | -1:57:38 | 0.049034 | 17.02 | 0.55 | 0.17 | Y | SX,BS | V25.ph | - | ||
| V26 | 16:47:14 | -1:59:37 | 1.843644 | 16.57 | 0.83 | 0.12 | Y | Sp? | V26.ph | - | ||
| V27 | 16:47:23 | -2:01:04 | 11.36074 | 17.89 | 1.12 | 0.44 | N | Sp?,RG? | V27.ph | - | ||
| V28 | 16:47:16 | -1:56:20 | 0.949850 | 13.85 | 1.00 | 0.04 | Y | Sp? | V28.ph | - | ||
| V29 | 16:47:14 | -1:59:37 | 1.842144 | 16.58 | 0.75 | 0.10 | Y | Sp? | V29.ph | - | ||
| V30 | 16:47:15 | -1:56:07 | 0.400692 | 16.39 | 0.50 | 0.03 | Y | Ell?,BS | V30.ph | - | ||
| V31 | 16:47:15 | -1:57:19 | 0.405218 | 17.61 | 0.44 | 0.08 | U | Ell?,BS | V31.ph | - | ||
| V32 | 16:47:13 | -1:57:15 | 0.499084 | 17.23 | 0.55 | 0.07 | U | Ell? | V32.ph | - | ||
| V33 | 16:47:15 | -1:57:19 | 0.682552 | 17.53 | 0.47 | 0.09 | Y | Ell?,BS | V33.ph | - | ||
| V34 | 16:47:13 | -1:58:01 | 0.352252 | 19.55 | 0.81 | 0.41 | U | Sp? | V34.ph | - | ||
| V35 | 16:47:12 | -1:57:20 | 0.962294 | 17.95 | 0.63 | 0.07 | U | Ell? | V35.ph | - | ||
| V36 | 16:47:06 | -1:57:34 | 0.774844 | 16.81 | 0.82 | 0.02 | Y | Ell? | V36.ph | - | ||
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*
We follow the naming convention of von Braun et al. (2002), who are the discoverers
of the first two variables listed in the table. Their variable V1 is not the W Vir pulsator referred to as V1 by Clement et al. (1988). |
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| a Proper motion membership status — Y - member, N - field star, U - uncertain | ||||||||||||
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b Variable type
EW - contact binary; EB - close ecppsing binary; EA - detached ecppsing binary; SX - SX-Phenicis type pulsator; Sp - spotted variable; Ell - ellipsoidal variable; BS - blue straggler; RG - red giant. |
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c Data columns:
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