2011AJ....142..194S

Query : 2011AJ....142..194S

2011AJ....142..194S - Astron. J., 142, 194 (2011/December-0)

Variable stars in the open cluster NGC 7142.

SANDQUIST E.L., SERIO A.W. and SHETRONE M.

Abstract (from CDS):

We present new discoveries of variable stars near the turnoff of the old open cluster NGC 7142. Contrary to previous studies, we detect eight contact or near-contact eclipsing binaries (including three near the cluster turnoff), and most of these have good probability of being cluster members. We also identified one long-period variable that resides far to the red of the cluster giant branch, and four new detached eclipsing binaries. We have re-examined the question of distance and reddening for the cluster and find that the distance is larger and the reddening lower than in most previous studies. In turn this implies that NGC 7142 is probably slightly younger than M67, and is about 3 Gyr old. With an age of this size, NGC 7142 would be one of a small group of clusters with main-sequence turnoff stars at the transition between convective and radiative cores.

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Journal keyword(s): binaries: close - binaries: eclipsing - binaries: general - open clusters and associations: general - open clusters and associations: individual: NGC 7142 - stars: variables: general

Nomenclature: Table 3: [SSS2011b] VNN (Nos V1-V14).

Simbad objects: 38

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Number of rows : 38
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 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 SA 92- reg 00 55 03.80 +00 47 13.2           ~ 102 0
3 PG 0231+051 WD* 02 33 41.3574299856 +05 18 43.649856216 14.562 15.776 16.096 16.267 16.639 DAO.6 149 0
4 SA 95- reg 03 53 21.0 -00 01 10           ~ 85 0
5 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
6 SA 98- reg 06 52 04.1 -00 23 58           ~ 179 0
7 Cl* NGC 2682 SAND 1063 RS* 08 51 13.3549065744 +11 51 40.172654052 15.557 14.84 13.573   12.591 G8IV 62 0
8 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
9 Cl* NGC 2682 SAND 1113 RS* 08 51 25.3043953560 +12 02 56.494997844 15.299 14.78 13.736     ~ 71 0
10 NGC 6253 OpC 16 59 06.4 -52 42 39     10.2     ~ 209 0
11 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
12 NGC 6940 OpC 20 34 28.4 +28 17 07           ~ 215 0
13 NGC 7129 OpC 21 43 01.1 +66 07 04     11.5     ~ 271 0
14 UCAC4 779-040081 ** 21 44 13.184544 +65 45 01.27728   16.62 15.71 15.518 14.56 ~ 3 0
15 [SSS2011b] V11 EB* 21 44 17.9010053653 +65 50 04.923372008   18.961 17.906   16.602 ~ 4 0
16 ZTF J214420.65+654459.2 EB* 21 44 20.6702719556 +65 44 59.163366892   19.43 18.35   17.15 ~ 4 0
17 [SSS2011b] V9 EB* 21 44 28.4385990144 +65 46 36.570864720   18.77 17.63   16.29 ~ 5 0
18 Cl* NGC 7142 CT 18 EB* 21 44 29.6203350504 +65 48 43.926060312   16.107 15.310   14.300 ~ 8 0
19 Cl* NGC 7142 CT 395 EB* 21 44 32.86 +65 45 26.3   15.695 14.864   13.825 ~ 5 0
20 [SSS2011b] V8 EB* 21 44 35.73 +65 45 04.7   18.394 17.288   15.915 ~ 1 0
21 Cl* NGC 7142 CT 399 * 21 44 36.6995565120 +65 43 19.179793092   14.823 13.448   11.917 ~ 4 0
22 V* V375 Cep EB* 21 44 54.7497002952 +65 43 55.291970820   16.882 16.115   15.035 ~ 21 0
23 [SSS2011b] V12 EB* 21 44 55.46 +65 52 59.0   19.487 18.330   16.990 ~ 1 0
24 NGC 7142 25 LP* 21 44 55.9829028240 +65 45 50.020731396 18.88 17.34 15.46   13.37 ~ 7 0
25 Cl* NGC 7142 HOAG 15 * 21 44 57.6071521175 +65 48 36.776013130 16.02 15.029 13.735   12.323 ~ 6 0
26 Cl* NGC 7142 HOAG 10 * 21 45 00.7326513600 +65 45 56.526864876 16.01 14.816 13.452   11.984 ~ 19 0
27 NGC 7142 OpC 21 45 10.2 +65 47 05   10.36 9.3     ~ 157 0
28 Cl* NGC 7142 CT 288 EB* 21 45 10.77 +65 44 41.3   16.84 15.95   14.83 ~ 2 0
29 Cl* NGC 7142 CT 155 BS* 21 45 15.1629244968 +65 49 24.298590360   16.10 15.38   14.45 ~ 13 0
30 Cl* NGC 7142 HOAG 16 * 21 45 20.4358526904 +65 48 31.000447476 16.27 15.123 13.743   12.217 ~ 12 0
31 V* V582 Cep LP* 21 45 28.3511702208 +66 00 16.618819824           ~ 6 0
32 Cl* NGC 7142 CT 199 EB* 21 45 30.0366573360 +65 46 42.322614384   16.98 15.80   14.42 ~ 5 0
33 Cl* NGC 7142 CT 203 * 21 45 32.9406758256 +65 47 31.137016092   15.091 13.765   12.618 ~ 8 0
34 Cl* NGC 7142 CT 356 Ir* 21 45 40.73 +65 43 40.0   18.88 17.63   16.10 ~ 2 0
35 [JH2011] NGC 7142 2222 * 21 45 57.0259187952 +65 44 10.548021588   15.076 13.665   12.180 ~ 6 0
36 [JH2011] NGC 7142 2288 * 21 46 00.93 +65 49 06.8   15.247 13.887   12.411 ~ 1 0
37 [SSS2011b] V14 EB* 21 46 06.80 +65 52 53.6           ~ 1 0
38 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0

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