2009MNRAS.397.1046T

Query : 2009MNRAS.397.1046T

2009MNRAS.397.1046T - Mon. Not. R. Astron. Soc., 397, 1046-1052 (2009/August-1)

Does Collinder 236 host a Cepheid calibrator ?

TURNER D.G., FORBES D., LEONARD P.J.T., ABDEL-LATIF M.A., MAJAESS D.J. and BERDNIKOV L.N.

Abstract (from CDS):

Photoelectric UBV photometry and star counts are presented for the previously unstudied open cluster Collinder 236, supplemented by observations for stars near the Cepheid WZ Car. Collinder 236 is typical of groups associated with Cepheids, with an evolutionary age of (3.2±1.1)x107 yr, but it is 1944±71 pc distant, only half the predicted distance to WZ Car. The cluster is reddened by E(B - V) ≃ 0.26, and has nuclear and coronal radii of rn≃ 2arcmin (1.1 pc) and Rc≃ 8arcmin (4.5 pc), respectively. The Cepheid is not a member of Collinder 236 on the basis of location beyond the cluster tidal radius and implied distance, but its space reddening can be established as E(B - V) = 0.268±0.006 s.e. from five adjacent stars. Period changes in WZ Car studied with the aid of archival data are revised. The period of WZ Car is increasing, its rate of +8.27±0.19s/yr being consistent with a third crossing of the instability strip.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): stars: evolution - stars: variables: Cepheids - open clusters and associations: individual: Collinder 236

Nomenclature: Table 1: [TFL2009] NN N=39.

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Berkeley 58 OpC 00 00 17.4 +60 56 28   10.39 9.7     ~ 72 0
2 V* CG Cas cC* 00 00 59.2385245512 +60 57 32.432852268   12.70 11.28     F5 113 0
3 V* VY Car cC* 10 44 32.6909254176 -57 33 55.327074480 8.12 7.70 6.87   6.299 F7Iab/b 231 0
4 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
5 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
6 V* SX Car cC* 10 46 05.8412346072 -57 32 51.122540256   9.93 9.06 9.51 8.047 F6Ib/II 110 0
7 Cl Ruprecht 91 OpC 10 47 45.3 -57 29 41           ~ 51 0
8 V* CL Car s*r 10 53 59.8806298368 -61 05 31.301433168   10.30 8.600     M5Iab 48 0
9 HD 305721 * 10 54 53.8572377352 -60 58 03.479997972 12.34 10.67 9.28     K5 6 0
10 [VBA82] WZ Car H * 10 55 08.17 -60 57 24.7 13.33 13.62 13.35     ~ 2 0
11 [VBA82] WZ Car G * 10 55 08.5681715136 -60 57 15.928143588 16.58 14.70 13.05     ~ 2 0
12 [VBA82] WZ Car K * 10 55 09.2059617096 -60 55 05.055821868   15.16 14.77     ~ 2 0
13 HD 305714 * 10 55 11.3943904704 -60 51 30.792291948 9.35 10.01 9.97 10.02   B2 20 0
14 [VBA82] WZ Car E * 10 55 12.0376452696 -60 54 53.694988812 14.81 13.91 12.77     ~ 2 0
15 TYC 8958-1200-1 * 10 55 13.8661483152 -60 59 10.256615700 11.55 11.88 11.44     ~ 3 0
16 TYC 8958-2284-1 * 10 55 17.2802957784 -60 54 57.034315656 12.24 12.01 11.88     ~ 3 0
17 [VBA82] WZ Car J * 10 55 17.60 -60 57 08.0 14.49 14.27 13.68     ~ 2 0
18 V* WZ Car cC* 10 55 18.7271183664 -60 56 23.951331672   10.40 9.37     F8 164 0
19 [VBA82] WZ Car F * 10 55 23.4595478040 -60 56 51.336359304 15.42 14.18 12.84     ~ 2 0
20 TYC 8958-2305-1 * 10 55 24.9031402560 -60 59 48.063563412 11.83 11.56 11.15     ~ 3 0
21 [VBA82] WZ Car 172 * 10 55 25.6599645864 -60 57 15.117703488 16.28 14.61 13.22     ~ 2 0
22 [VBA82] WZ Car D * 10 55 30.7480441056 -60 55 38.081287524 12.25 12.48 12.31     ~ 2 0
23 CPD-60 2391 * 10 55 43.8015556680 -60 53 33.026707788 10.77 11.10 10.69     ~ 3 0
24 TYC 8958-4254-1 Pu* 10 56 04.5329971080 -61 09 29.668458780   11.67 11.60     ~ 3 0
25 HD 94936 * 10 56 20.8622101128 -61 22 05.111060664 9.07 9.66 9.47 9.78   B3/5Ib/II 25 0
26 V* IN Car EB* 10 56 23.4067172256 -61 14 45.413195820     13.799   13.232 ~ 10 0
27 [TFL2009] 39 * 10 56 24.82 -61 09 08.8 13.56 13.41 13.01     ~ 1 0
28 HD 305806 * 10 56 27.5364763488 -61 11 17.006911476   10.13 9.92     A 6 0
29 TYC 8958-3822-1 PM* 10 56 28.0444035072 -61 09 34.681245516   11.62 10.95     ~ 2 0
30 CPD-60 2398 Em* 10 56 28.0738869312 -61 05 56.026328748 10.13 11.04 10.83 10.79   B0/2 18 0
31 TYC 8958-4221-1 Pu* 10 56 28.1640440568 -61 12 02.371263300   12.32 12.35     ~ 3 0
32 TYC 8958-3999-1 * 10 56 31.2683444136 -61 08 57.203912796   11.44 10.96     ~ 2 0
33 HD 305805 * 10 56 31.8763125864 -61 06 47.802320424   10.73 10.68 10.81 10.57 B5 8 0
34 TYC 8958-3849-1 * 10 56 32.7655054488 -61 04 47.190981180   12.41 11.97     ~ 5 0
35 [TFL2009] 21 * 10 56 37.37 -61 05 24.2 13.26 12.70 11.73     ~ 1 0
36 CPD-60 2400 Em* 10 56 38.9628291408 -61 08 45.135776796   10.81 10.77     B2/4 4 0
37 [TFL2009] 27 * 10 56 39.06 -61 13 19.9 11.92 12.27 12.03     ~ 1 0
38 HD 305807 * 10 56 39.9140739624 -61 12 12.814190820   11.08 11.12     A 11 0
39 TYC 8958-4204-1 * 10 56 40.1868398736 -61 07 30.307269612   11.85 12.43     ~ 3 0
40 TYC 8958-3687-1 * 10 56 40.3873761984 -61 05 20.523192252   12.00 12.44     ~ 1 0
41 TYC 8958-3775-1 * 10 56 41.1868831689 -61 06 33.619105905 11.54 12.32 12.28     ~ 1 0
42 [TFL2009] 35 * 10 56 41.92 -61 09 32.0 13.10 12.89 12.64     ~ 1 0
43 TYC 8958-4227-1 * 10 56 42.2982 -61 09 29.773   12.13 12.41     ~ 2 0
44 [TFL2009] 34 * 10 56 43.77 -61 05 10.9 14.49 13.74 12.59     ~ 1 0
45 [TFL2009] 7 * 10 56 44.49 -61 12 50.3 11.15 10.99 10.76     ~ 1 0
46 [TFL2009] 37 * 10 56 45.40 -61 04 47.8 13.00 12.97 12.76     ~ 1 0
47 [TFL2009] 28 * 10 56 47.08 -61 07 19.6 11.83 12.26 12.08     ~ 1 0
48 [TFL2009] 13 * 10 56 52.55 -61 12 28.9 11.88 11.76 11.22     ~ 1 0
49 [TFL2009] 29 * 10 56 55.63 -61 03 18.6 15.09 13.47 12.18     ~ 1 0
50 HD 95020 * 10 56 57.7727195856 -61 06 38.674092600   9.98 9.82     A0V 8 0
51 [TFL2009] 22 * 10 56 58.47 -61 06 49.5 14.96 13.26 11.80     ~ 1 0
52 [TFL2009] 31 * 10 56 59.55 -61 05 17.5 12.00 12.35 12.22     ~ 1 0
53 [TFL2009] 36 * 10 56 59.81 -61 04 36.0 13.14 12.98 12.65     ~ 1 0
54 TYC 8958-4033-1 * 10 57 02.3685364032 -61 10 34.415508252   12.00 11.27     ~ 2 0
55 HD 95032 * 10 57 04.4851476360 -61 11 17.894992560   9.18 8.84     A4V 11 0
56 V* CD Car EB* 10 57 06.5081620920 -61 01 12.077866668   13.933 13.619 13.696   ~ 11 0
57 TYC 8958-4359-1 SB* 10 57 09.7906771704 -61 12 21.846605688   12.25 11.73     ~ 2 0
58 [TFL2009] 38 * 10 57 14.42 -61 08 59.8 12.76 13.00 12.87     ~ 1 0
59 HD 95056 * 10 57 20.1501114264 -61 06 28.991101320 9.02 9.74 9.76     B3/5III 6 0
60 Cl Collinder 236 OpC 10 57 22 -61 07.2           ~ 29 0
61 TYC 8958-3514-1 * 10 57 23.1808385712 -61 04 24.993755328   11.10 11.39     ~ 2 0
62 HD 305799 * 10 57 23.9186408568 -61 03 11.407938372   10.53 9.52     G0 5 0
63 [TFL2009] 15 * 10 57 24.36 -61 08 59.9 13.69 12.57 11.39     ~ 1 0
64 TYC 8958-3247-1 * 10 57 25.2168639624 -61 05 07.778975820   12.36 11.70     ~ 2 0
65 TYC 8958-3854-1 * 10 57 27.3118051368 -61 09 27.904527108   11.84 11.63 11.53 11.307 ~ 7 0
66 TYC 8958-4248-1 * 10 57 29.3815539984 -61 04 23.180258208 11.29 11.77 11.67     ~ 2 0
67 TYC 8958-2622-1 * 10 57 36.9573960408 -61 04 03.341867772   11.58 11.14     ~ 2 0
68 MR 32 WR* 10 58 45.4633977552 -61 10 42.955415616   11.56 11.04 10.45   O5Ifp 34 0
69 Cl Stock 16 OpC 13 19 26.4 -62 37 19           ~ 95 0
70 Cl Roslund 3 OpC 19 58 49.3 +20 30 18           ~ 58 0

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