Last update: 2018.02.19 by Wojtek Pych
case_about.jpg
case_people.jpg
case_papers.jpg
case_results.jpg
case_logo1.jpg


The Clusters AgeS Experiment (CASE):
Variable Stars in the Open Cluster NGC 6253

Kaluzny, J.; Rozyczka, M; Thompson, I. B.; Pych, W.

Abstract:
The field of the metal-rich open cluster NGC 6253 has been surveyed in a search for variable stars. A total of 25 new variables were detected, 14 of which are bright stars with 13<V<15 mag. This domain was not covered in an earlier work by de Marchi et al. (2010). Four variables, including three short-period eclipsing binaries, are candidate blue straggler stars. Two new detached eclipsing binaries at the turnoff of the cluster and another one on the subgiant branch were identified. These three systems deserve a detailed follow-up study aimed at a determination of the age and distance of NGC 6253. New photometry for 132 stars from the sample of de Marchi et al. (2010) is provided.

DOWNLOADS:
The paper (PDF) "The Clusters AgeS Experiment (CASE): Variable Stars in the Open Cluster NGC 6253"
Kaluzny, J.; Rozyczka, M.; Thompson, I. B.; Pych, W.;
2014, Acta Astronomica, vol 64, no 2, p. 77-88
Template image
in V-band (FITS)
From 1-m Swope telescope.
Equatorial coordinates
(J2000.0)
ngc6253_RA_DEC_v.dat

Equatorial coordinates (Equinox J2000.0) and instrumental V-band magnitudes of all objects in the template image (ngc6253_V.fits) for which rectangular coordinates were measured. Approximate standard V-magnitudes are by 1.6795 mag larger.
(V, B-V)
color-magnitude diagram data
ngc6253_BV.dat

B and V data for the observed field. Magnitudes and colors are transformed to the standard system based on secondary standards from Sagar et al. 2001 (MNRAS 327,23) as described in Kaluzny et al. (2014)
Lighcurves in standard V-magnitudes
(PostScript)
Newly detected periodic variable stars
Newly detected long period variable stars
Previously known periodic variable stars
Previously known variable stars with period not found

Table 1: Basic properties of newly detected variable stars in NGC 6253a
Star Xb Yb Period [days] Vmax Δ V B-V PMc Typed V light-curvee B light-curvee Remarks
V00 1107.81 2029.09 0.03043276 12.861 - 0.372 δ Sct V00V.ph V00B.dat BS
V01 1892.00 1532.14 0.2856667 17.964 - 0.949 EW V01V.ph V01B.dat
V02 677.70 761.62 0.32019303 19.560 - 1.022 EW V02V.ph V02B.dat
V03 1851.06 169.41 0.3414981 19.003 - 1.122 EW V03V.ph V03B.dat
V04 1829.64 1393.97 0.34401057 20.242 - 0.899 EW V04V.ph V04B.dat
V05 693.81 633.84 0.35801236 14.483 - 0.829 EW V05V.ph V05B.dat
V06 1102.56 2026.73 0.39768833 16.826 - 0.867 EW V06V.ph V06B.dat
V07 1853.36 1972.34 0.41130522 16.816 - 0.596 RRc V07V.ph V07B.dat
V08 1651.25 630.83 0.47518561 14.647 - 0.795 0 Sp, Ell? V08V.ph V08B.dat
V09 1878.06 166.36 0.47911411 15.716 - 0.629 EW V09V.ph V09B.dat
V10 1697.36 1922.05 0.53285385 18.106 - 0.859 EW V10V.ph V10B.dat
V11 601.35 544.87 0.57914361 13.891 - 0.643 EW V11V.ph V11B.dat BS
V12 890.80 497.03 0.65429982 15.200 - 0.857 Sp V12V.ph V12B.dat
V13 958.28 1059.45 0.88644025 13.893 - 0.680 96 EB V13V.ph V13B.dat BS
V14 1281.41 1027.25 1.15518598 13.480 - 0.615 95 EA V14V.ph V14B.dat BS
V15 942.75 1010.69 2.572391 14.713 - 0.837 95 EA V15V.ph V15B.dat
V16 1170.00 911.45 4.58059743 14.546 - 0.837 97 EA V16V.ph V16B.dat
V17 1941.59 185.25 5.1116234 14.792 - 1.054 EA V17V.ph V17B.dat
V18 1653.72 534.23 25.501 15.225 - 1.806 56 Sp V18V.ph V18B.dat
V19 1864.16 99.77 27.4762 14.688 - 1.106 Sp V19V.ph V19B.dat
V20 1272.31 954.69 28.2517 13.804 - 1.307 95 Sp V20V.ph V20B.dat
V21 776.23 1697.17 39.4913 13.570 - 1.754 91 Sp V21V.ph V21B.dat
V22 219.26 2042.26 18.922 - 1.725 P? V22V.dat V22B.dat
V23 1090.09 1086.08 94 15.203 - 0.873 EA V23V.dat V23B.dat
V24 1619.19 603.17 98 14.722 - 1.757 P V24V.dat V24B.dat
V25 195.57 729.77 15.071 - 1.773 P V25V.dat V25B.dat
a The exception is V15 which was described by Montalto et al. 2011, A&A, 535, 39
b Pixel coordinate in the template image from the Swope telescope
c Membership probability is taken from Montalto et al. 2009, A&A 505, 1129
d Variable type

EW - contact binary; EB - close ecppsing binary; EA - detached ecppsing binary;

RR - RR Lyrae c-type pulsator; P - pulsating (long period);

Sp - spotted; Ell - elliptical

e Instrumental photometric data

Data columns:
  1. HJD - 2 450 000.0
  2. magnitude
  3. error of magnitude (dummy points are maked with the error=9.999)
  4. (phase)
f BS - blue straggler candidate

Table 2: Basic properties of previously known variable stars in NGC 6253
Star Xa Ya Period [days] Vmax Δ V B-V PMb Type V light-curvec B light-curved Remarks
145 1389.32 1890.24 0.291107 17.127 - 1.251 0 - 145V.ph 145B.dat
208 1621.51 1882.33 0.356093 20.302 - 0.926 - 208V.ph 208B.dat
447 1589.74 1852.52 0.915933 17.528 - 0.731 - 447V.ph 447B.dat
455 1119.32 1851.46 1.375611 19.764 - 1.478 - 455V.ph 455B.dat
564 1603.82 1839.39 0.28755 20.595 - 1.006 - 564V.ph 564B.dat
690 1610.61 1820.60 0.856545 17.885 - 1.065 - 690V.ph 690B.dat
1015 1141.02 1783.89 0.3872 15.889 - 0.919 22 - 1015V.ph 1015B.dat
1679 928.84 1702.93 33.7208 16.469 - 1.175 - 1679V.ph 1679B.dat
1798 43.97 1669.79 0.308725 19.113 - 0.947 - 1798V.ph 1798B.dat
1866 1782.11 1682.77 0.851434 16.302 - 0.944 0 - 1866V.ph 1866B.dat
1907 1469.44 1678.50 1.343197 17.204 - 1.082 0 - 1907V.ph 1907B.dat
2131 318.62 1626.75 0.391703 20.077 - 1.470 - 2131V.ph 2131B.dat
2366 912.34 1627.78 0.363498 17.695 - 0.910 35 - 2366V.ph 2366B.dat
2948 1767.20 1557.92 0.317965 19.748 - 0.957 - 2948V.ph 2948B.dat
3428 1447.65 1503.93 0.283625 18.826 - 1.072 4 - 3428V.ph 3428B.dat
3430 327.74 1456.31 0.723321 16.690 - 0.694 - 3430V.ph 3430B.dat
3734 1462.03 1467.49 0.367321 19.383 - 0.917 - 3734V.ph 3734B.dat
4317 2009.36 1690.95 0.327311 18.079 - 0.962 - 4317V.ph 4317B.dat
4424 375.10 1325.49 0.445459 19.060 - 0.821 - 4424V.ph 4424B.dat
4426 749.16 1387.86 2.259672 16.740 - 1.336 0 - 4426V.ph 4426B.dat
4463 1801.23 1383.35 0.436879 20.081 - 1.211 - 4463V.ph 4463B.dat
4477 1268.42 1381.13 0.238022 18.598 - 1.006 - 4477V.ph 4477B.dat
4601 119.92 1304.88 4.471527 19.629 - 1.242 - 4601V.ph 4601B.dat
4607 1168.48 1365.57 0.351939 15.919 - 0.969 0 - 4607V.ph 4607B.dat
4611 1032.63 1364.93 0.332072 19.003 - 1.081 10 - 4611V.ph 4611B.dat
4843 1532.61 1338.70 0.219917 18.528 - 1.041 - 4843V.ph 4843B.dat
5077 1607.37 1312.61 6.211395 19.417 - 1.430 8 - 5077V.ph 5077B.dat
5898 1464.67 1217.30 1.598063 17.992 - 1.363 53 - 5898V.ph 5898B.dat
6236 582.62 1092.73 4.204647 16.580 - 0.862 - 6236V.ph 6236B.dat
6387 1085.37 1160.87 0.912778 16.375 - 0.955 85 - 6387V.ph 6387B.dat
6503 937.79 1147.54 0.338004 18.848 - 1.059 - 6503V.ph 6503B.dat
6539 1785.50 1142.97 0.682346 18.669 - 1.259 - 6539V.ph 6539B.dat
6772 615.49 1020.18 0.455322 18.371 - 0.955 - 6772V.ph 6772B.dat
7252 351.08 953.12 0.337558 18.609 - 1.083 - 7252V.ph 7252B.dat
7619 992.01 1013.88 1.135465 17.496 - 1.073 7 - 7619V.ph 7619B.dat
8822 858.47 879.08 0.382866 18.782 - 0.831 50 - 8822V.ph 8822B.dat
9135 200.11 711.11 0.321094 19.865 - 1.361 - 9135V.ph 9135B.dat
9250 1941.03 1085.70 1.07618 19.131 - 1.379 - 9250V.ph 9250B.dat
9268 1445.69 828.14 0.269288 16.189 - 1.226 87 - 9268V.ph 9268B.dat
9421 2009.38 954.65 0.15595 18.439 - 0.935 - 9421V.ph 9421B.dat
9620 405.95 645.07 0.60962 16.030 - 0.680 - 9620V.ph 9620B.dat
9747 2031.69 1985.77 0.062489 16.580 - 0.568 - 9747V.ph 9747B.dat
9901 1388.65 756.46 0.256253 18.262 - 1.191 - 9901V.ph 9901B.dat
9914 223.35 605.00 0.2865 18.652 - 1.158 - 9914V.ph 9914B.dat
10042 1186.96 740.81 3.067603 16.360 - 0.936 87 - 10042V.ph 10042B.dat
10059 445.16 585.53 0.238228 19.763 - 1.429 - 10059V.ph 10059B.dat
10299 1951.65 322.68 0.71554 18.171 - 1.137 - 10299V.ph 10299B.dat
10340 1515.83 713.58 0.334794 16.339 - 0.964 38 - 10340V.ph 10340B.dat
10521 111.99 527.23 0.135393 20.016 - 1.409 - 10521V.ph 10521B.dat
10540 1025.47 689.94 0.430057 17.302 - 1.067 72 - 10540V.ph 10540B.dat
10578 1378.92 686.62 10.884 17.422 - 1.168 - 10578V.ph 10578B.dat
10609 736.48 683.59 0.831558 17.999 - 0.756 58 - 10609V.ph 10609B.dat
10805 1197.63 663.16 0.370965 18.226 - 1.051 32 - 10805V.ph 10805B.dat
10853 1045.18 656.67 0.226709 16.868 - 1.091 78 - 10853V.ph 10853B.dat
11077 739.93 632.00 1.237522 17.211 - 1.060 71 - 11077V.ph 11077B.dat
11351 571.25 2042.19 18.68 15.080 - 1.273 - 11351V.ph 11351B.dat
11470 1388.57 589.26 0.299128 20.451 - 0.902 21 - 11470V.ph 11470B.dat
11608 456.60 388.42 24.95 18.590 - 1.147 - 11608V.ph 11608B.dat
11636 1340.71 572.07 0.534155 18.822 - 1.101 59 - 11636V.ph 11636B.dat
11777 436.44 365.95 0.664692 17.721 - 1.006 - 11777V.ph 11777B.dat
11785 1913.33 1067.53 0.821698 16.427 - 0.919 - 11785V.ph 11785B.dat
12190 74.18 311.59 0.154485 19.282 - 1.168 - 12190V.ph 12190B.dat
12230 968.46 505.27 1.091468 17.584 - 1.293 4 - 12230V.ph 12230B.dat
12313 1988.23 138.36 33.83 17.407 - 1.334 - 12313V.ph 12313B.dat
12434 338.76 275.05 0.390618 19.319 - 1.253 - 12434V.ph 12434B.dat
13073 640.74 191.98 1.062133 16.269 - 1.083 - 13073V.ph 13073B.dat
13288 1684.79 392.24 0.472933 15.285 - 0.799 3 - 13288V.ph 13288B.dat
13353 1531.60 385.01 42.66 18.062 - 1.322 - 13353V.ph 13353B.dat
13453 1299.38 372.97 0.351168 19.307 - 0.850 - 13453V.ph 13453B.dat
13573 984.16 359.52 4.931323 16.967 - 0.901 8 - 13573V.ph 13573B.dat
13846 1500.83 328.82 1.914206 18.030 - 1.259 39 - 13846V.ph 13846B.dat
13982 139.73 67.01 0.915064 16.934 - 1.076 - 13982V.ph 13982B.dat
14603 1410.74 243.80 0.282741 19.285 - 1.091 43 - 14603V.ph 14603B.dat
14735 1311.23 228.23 5.5232 18.240 - 1.361 55 - 14735V.ph 14735B.dat
14911 1440.99 209.86 0.247246 18.171 - 1.060 63 - 14911V.ph 14911B.dat
15143 1458.69 184.90 0.315207 16.109 - 1.214 58 - 15143V.ph 15143B.dat
15307 894.53 166.33 0.224513 19.771 - 1.626 43 - 15307V.ph 15307B.dat
15389 1706.84 158.56 0.258728 19.955 - 1.190 - 15389V.ph 15389B.dat
15984 209.32 2118.12 0.251147 18.882 - 1.258 - 15984V.ph 15984B.dat
16373 1518.06 42.78 0.187679 19.837 - 0.714 - 16373V.ph 16373B.dat
16994 1665.69 2131.25 0.519009 19.252 - 0.807 - 16994V.ph 16994B.dat
17580 985.93 2066.54 0.436408 16.254 - 0.769 - 17580V.ph 17580B.dat
17881 161.57 1578.69 0.254318 20.049 - 1.457 - 17881V.ph 17881B.dat
19951 625.11 1059.44 0.310734 19.858 - 0.904 - 19951V.ph 19951B.dat
21207 309.84 766.60 0.393349 20.252 - 1.310 - 21207V.ph 21207B.dat
21930 1131.13 2095.45 0.242102 19.222 - 1.450 - 21930V.ph 21930B.dat
22477 1598.90 546.11 9.733 15.609 - 1.288 3 - 22477V.ph 22477B.dat
22574 849.62 502.88 0.681708 18.924 - 0.548 40 - 22574V.ph 22574B.dat
22683 485.69 402.66 0.5498 18.779 - 0.801 - 22683V.ph 22683B.dat
23188 1768.90 215.44 0.496839 14.765 - 0.775 87 - 23188V.ph 23188B.dat
23368 583.29 235.64 16.385 15.998 - 0.877 - 23368V.ph 23368B.dat
25070 982.19 1228.36 1.4553 18.681 - 1.141 - 25070V.ph 25070B.dat
26490 483.56 1403.53 27.26 16.888 - 1.846 - 26490V.ph 26490B.dat
26552 635.34 1361.31 0.240221 17.829 - 1.002 - 26552V.ph 26552B.dat
26902 1246.93 1230.63 2.200544 15.036 - 0.899 90 - 26902V.ph 26902B.dat
27757 505.53 361.81 0.273067 18.255 - 1.091 - 27757V.ph 27757B.dat
589 1554.91 1835.29 19.415 - 1.143 - - 589B.dat
729 284.67 1805.17 18.087 - 1.079 - - 729B.dat
771 359.48 1800.27 19.951 - 1.717 - - 771B.dat
1274 2018.85 304.87 20.883 - 1.282 - - 1274B.dat
1613 497.89 1691.40 19.110 - 1.095 - - 1613B.dat
2749 65.33 1545.91 21.398 - 1.184 - - 2749B.dat
4540 781.03 1373.12 17.175 - 1.724 - - 4540B.dat
7392 526.07 933.97 18.143 - 1.031 - - 7392B.dat
8123 1103.49 957.75 21.343 - 1.959 - - 8123B.dat
8284 1310.62 940.85 16.303 - 0.901 - - 8284B.dat
9775 794.28 772.97 64 18.257 - 1.242 - - 9775B.dat
10372 1650.72 707.88 26 18.153 - 1.198 - - 10372B.dat
10725 541.51 500.81 21.335 - 0.946 - - 10725B.dat
11977 396.59 340.32 16.569 - 0.739 - - 11977B.dat
13070 845.52 416.08 19.680 - 1.003 - - 13070B.dat
13344 645.34 154.24 16.052 - 0.860 - - 13344B.dat
13347 1989.75 1224.35 19.677 - 1.054 - - 13347B.dat
13389 1110.83 381.40 20.720 - 1.123 - - 13389B.dat
13461 230.03 138.35 15.436 - 0.770 - - 13461B.dat
14012 1467.61 309.97 0 20.389 - 0.954 - - 14012B.dat
14471 784.69 258.64 19.430 - 1.409 - - 14471B.dat
14996 932.72 201.52 21.078 - 1.467 - - 14996B.dat
15240 1348.09 174.61 6 16.450 - 0.995 - - 15240B.dat
15343 1194.12 163.21 15.799 - 0.946 - - 15343B.dat
15577 1565.35 134.84 19.397 - 0.993 - - 15577B.dat
15649 1468.70 126.37 21.318 - 0.935 - - 15649B.dat
16144 1579.16 70.75 19.750 - 1.220 - - 16144B.dat
16725 1231.37 1.03 51 19.817 - 1.129 - - 16725B.dat
17345 1419.75 2091.27 21.010 - 1.473 - - 17345B.dat
18145 497.42 1507.80 20.949 - 1.172 - - 18145B.dat
21621 1463.73 937.34 20.542 - 1.386 - - 21621B.dat
22278 1802.57 625.55 20.261 - 1.593 - - 22278B.dat
24765 1717.20 1559.50 21.313 - 1.255 - - 24765B.dat
25252 1996.72 420.98 21.298 - 1.179 - - 25252B.dat
25539 1527.14 723.79 17.957 - 0.942 - - 25539B.dat
27582 1380.40 70.67 21.230 - 1.241 - - 27582B.dat
a Pixel coordinate in the template image from the Swope telescope
b Membership probability is taken from Montalto et al. 2009, A&A 505, 1129
c Instrumental photometric data

Data columns:
  1. HJD - 2 450 000.0
  2. magnitude
  3. error of magnitude (dummy points are maked with the error=9.999)
  4. phase
d Instrumental photometric data

Data columns:
  1. HJD - 2 450 000.0
  2. magnitude
  3. error of magnitude (dummy points are maked with the error=9.999)