2016AJ....151...27S


Query : 2016AJ....151...27S

2016AJ....151...27S - Astron. J., 151, 27 (2016/February-0)

Search for low-mass objects in the globular cluster M4. I. Detection of variable stars.

SAFONOVA M., MKRTICHIAN D., HASAN P., SUTARIA F., BROSCH N., GORBIKOV E. and JOSEPH P.

Abstract (from CDS):

With every new discovery of an extrasolar planet, the absence of planets in globular clusters (GCs) becomes more and more conspicuous. Null detection of transiting hot Jupiters in GCs 47 Tuc, ω Cen, and NGC 6397 presents an important puzzle, raising questions about the role played by cluster metallicity and environment on formation and survival of planetary systems in densely populated stellar clusters. GCs were postulated to have many free-floating planets, for which microlensing (ML) is an established tool for detection. Dense environments, well-constrained distances and kinematics of lenses and sources, and photometry of thousands of stars simultaneously make GCs the ideal targets to search for ML. We present first results of a multisite, 69-night-long campaign to search for ML signatures of low-mass objects in the GC M4, which was chosen because of its proximity, location, and the actual existence of a planet. M4 was observed in R and I bands by two telescopes, 1 m T40 and 18-inch C18, of the Wise Observatory, Tel Aviv, Israel, from 2011 April to July. Observations on the 1 m telescope were carried out in service mode, gathering 12 to 48 20 s exposures per night for a total of 69 nights. C18 observations were done for about 4 hr a night for six nights in 2011 May. We employ a semiautomated pipeline to calibrate and reduce the images to the light curves that our group is developing for this purpose, which includes the differential photometry package DIAPL, written by Wozniak and modified by W. Pych. Several different diagnostics are employed for search of variability/transients. While no high-significance ML event was found in this observational run, we have detected more than 20 new variables and variable candidates in the M4 field, which we present here.

Abstract Copyright:

Journal keyword(s): globular clusters: general - globular clusters: individual: M4 - gravitational lensing: micro - stars: variables: general

Nomenclature: Table 5, Fig. 10: [SMH2016] NVNN N=19 among (Nos 1-20). Table 6, Fig. 15: [SMH2016] VCN (Nos 1-7).

CDS comments: Table 5: no star found at the position 16:21:47.99 -26:50:47.2 (star NV17 2).

Simbad objects: 99

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Number of rows : 99
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3658 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 979 0
3 BD+48 740 * 02 42 58.2182761768 +48 55 48.225888943   10.05 8.70     K3III 29 0
4 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 508 0
5 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 401 0
6 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 753 0
7 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3127 0
8 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 617 0
9 [SMH2016] NV11 EB* 16 20 49.93 -26 36 07.9           ~ 1 0
10 CRTS J162051.2-263620 RR* 16 20 51.2762254772 -26 36 19.588542677     15.68     ~ 3 0
11 UGCS J162103.99-262435.9 EB* 16 21 03.99 -26 24 35.9           ~ 1 0
12 [SMH2016] NV20 dS* 16 21 05.83 -26 24 15.7           ~ 1 0
13 CRTS J162125.9-264607 RR* 16 21 26.0225264778 -26 46 06.992981218     15.58     ~ 3 0
14 [SMH2016] NV7 RR* 16 21 47.5042405227 -26 09 41.524882985           ~ 2 0
15 UCAC4 316-086951 EB* 16 21 48.436800 -26 50 54.50532   14.94 13.62 13.87   ~ 1 0
16 [SMH2016] NV1 Pu* 16 21 55.81 -26 13 29.0           ~ 1 0
17 Cl* NGC 6121 SAW V76 Ro* 16 22 05.5481061596 -26 21 43.127735419 15.44 14.32 13.68   12.62 ~ 5 0
18 [SMH2016] NV9 V* 16 22 06.35 -26 39 25.8           ~ 1 0
19 [SMH2016] VC7 V*? 16 22 18.00 -26 29 11.6           ~ 1 0
20 UCAC4 318-087831 V*? 16 22 20.0068538731 -26 32 38.675461199       15.05   ~ 1 0
21 UCAC4 318-087841 V*? 16 22 22.8977726291 -26 24 01.925836227   15.59 13.61 13.24   ~ 1 0
22 Cl* NGC 6121 SAW V34 RR* 16 22 33.6371846056 -26 24 46.658030280 15.47 14.73 14.02   12.77 ~ 13 0
23 UCAC4 318-087877 V*? 16 22 34.8032550257 -26 27 13.138644796       15.10   ~ 1 0
24 [SMH2016] NV2 Pu* 16 22 35.8542666247 -26 19 36.556923053           ~ 2 0
25 UCAC4 318-087915 V*? 16 22 41.3516634494 -26 26 01.523471550   16.42 14.54 14.22   ~ 1 0
26 UCAC4 319-085449 V*? 16 22 41.5204535927 -26 23 03.585945179       14.98   ~ 1 0
27 [SMH2016] NV18 EB* 16 22 50.63 -26 28 51.4           ~ 1 0
28 Cl* NGC 6121 SAW V75 V* 16 22 51.6719502663 -26 25 14.825406795 14.50 14.31 13.37   12.14 ~ 5 0
29 [SMH2016] NV16 dS* 16 22 57.80 -26 54 40.5           ~ 1 0
30 2MASS J16231442-2636055 RG* 16 23 14.424 -26 36 05.53 14.64 12.73 10.88 9.80 9.04 ~ 43 0
31 Cl* NGC 6121 SAW V44 * 16 23 15.27 -26 31 17.9           ~ 2 0
32 Cl* NGC 6121 SAW V36 RR* 16 23 19.4338579115 -26 35 49.179263923 14.42 14.13 13.42 13.03 12.40 ~ 9 0
33 Cl* NGC 6121 SAW V3 RR* 16 23 19.4538954841 -26 39 57.108224882 14.71 13.65 13.01   12.28 ~ 15 0
34 [KTR2013] V64 SX* 16 23 20.80 -26 31 02.2 19.43 19.07 18.44 18.02 17.55 ~ 3 0
35 CD-26 11309 * 16 23 21.0157455759 -26 37 11.537012438   11.50 9.97     K2 38 0
36 Cl* NGC 6121 SAW V51 * 16 23 27.72 -26 33 06.1           ~ 2 0
37 Cl* NGC 6121 SAW V61 RR* 16 23 29.7333805816 -26 29 50.382240217 14.35 13.78 13.26 12.90 12.46 ~ 15 0
38 Cl* NGC 6121 SAW V12 RR* 16 23 30.7949395554 -26 34 59.033416983 14.49 14.23 13.58 13.10 12.54 ~ 20 0
39 CD-26 11313 AB* 16 23 30.8921074956 -26 27 04.098950020   12.598 10.808   8.880 K2 38 0
40 [KTR2013] V66 EB* 16 23 32.26 -26 31 41.1 17.71 17.621 16.843 16.20 15.64 ~ 12 0
41 Cl* NGC 6121 SAW V16 RR* 16 23 32.4790494346 -26 30 23.068993065 14.47 14.05 13.34 12.85 12.31 ~ 16 0
42 [KTR2013] V62 SX* 16 23 32.62 -26 36 13.1 20.05 19.74 19.13 18.72 18.22 ~ 3 0
43 UCAC4 318-088763 V*? 16 23 33.139 -26 30 56.80       13.67   ~ 1 0
44 Cl* NGC 6121 SAW V70 EB* 16 23 33.28 -26 31 08.0   17.97 17.03     ~ 6 0
45 NGC 6121 172 * 16 23 33.64 -26 32 00.9   13.697 13.277     ~ 11 0
46 Cl* NGC 6121 SAW V17 RG* 16 23 34.0236108671 -26 31 07.861614654 15.06 14.188 12.891   11.331 ~ 12 0
47 [BPH2004] CX 9 X 16 23 34.224 -26 29 55.69           ~ 3 0
48 Cl* NGC 6121 SAW V77 V* 16 23 34.276 -26 29 55.95 16.32 15.83 14.66 13.92 23.21 ~ 7 0
49 Cl* NGC 6121 SAW V18 RR* 16 23 34.6783706423 -26 31 04.687931726 14.66 14.02 13.36 12.88 12.35 ~ 14 0
50 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1726 0
51 1AXG J162334-2647 Ce? 16 23 35.6605753751 -26 47 45.687709299           ~ 6 0
52 Cl* NGC 6121 SAW V21 RR* 16 23 35.9069902232 -26 31 33.806593510 14.40 13.88 13.19 12.70 12.16 ~ 12 0
53 Cl* NGC 6121 SAW V40 RR* 16 23 36.453 -26 30 43.37   14.52 13.27     ~ 12 0
54 Cl* NGC 6121 SAW V78 V* 16 23 36.73 -26 31 50.6 16.57 16.24 15.20 14.53 13.86 ~ 5 0
55 Cl* NGC 6121 SAW V67 EB* 16 23 36.81 -26 31 44.1 17.27 17.12 16.25 15.65 15.09 ~ 9 0
56 Cl* NGC 6121 SAW V47 * 16 23 37.34 -26 33 18.5           ~ 4 0
57 Cl* NGC 6121 SAW V45 * 16 23 37.35 -26 34 08.4           ~ 2 0
58 Cl* NGC 6121 SAW V50 * 16 23 37.55 -26 30 09.9           ~ 2 0
59 Cl* NGC 6121 SAW V46 RR? 16 23 37.79 -26 34 00.9           ~ 2 0
60 Cl* NGC 6121 SAW V24 RR* 16 23 38.0193723819 -26 30 41.868373413 14.60 14.02 13.33 12.84 12.31 ~ 17 0
61 NAME PSR B1620-26 b Pl 16 23 38.2218 -26 31 53.769           ~ 34 1
62 Cl* NGC 6121 SAW V72 EB* 16 23 38.51 -26 32 10.8 16.76 16.46 15.83 15.40 15.01 ~ 20 0
63 [KTR2013] V68 SX* 16 23 38.59 -26 30 30.9 16.14 15.84 15.24 14.82 14.38 ~ 3 0
64 Cl* NGC 6121 SAW V25 RR* 16 23 39.3980857916 -26 30 21.395755514 14.07 13.94 13.23 12.74 12.20 ~ 18 0
65 [KTR2013] V61 SX* 16 23 42.35 -26 33 17.9 16.60 16.29 15.70 15.29 14.83 ~ 3 0
66 Cl* NGC 6121 SAW V54 RG* 16 23 42.8012444638 -26 29 27.611902597 17.79 13.98 12.66 11.86 11.06 ~ 17 0
67 Cl* NGC 6121 SAW V60 RG* 16 23 45.2125344184 -26 33 56.903140476 15.54 14.82 13.56 12.79 12.02 ~ 17 0
68 Cl* NGC 6121 SAW V55 V* 16 23 45.9165474168 -26 23 36.978246596 14.22 13.70 13.24   12.59 ~ 11 0
69 Cl* NGC 6121 SAW V56 RG* 16 23 45.9298474046 -26 33 38.945212420 15.02 14.24 12.93 12.13 11.35 ~ 20 0
70 Cl* NGC 6121 SAW V57 RG* 16 23 46.9275656202 -26 33 43.897229794 15.22 14.256 12.980   11.341 ~ 19 0
71 [KTK97] V46 HS* 16 23 47.19 -26 31 56.5 18.85 18.85 18.58 18.39 18.16 sdB 20 0
72 Cl* NGC 6121 SAW V58 HB* 16 23 47.8241686880 -26 32 05.996725461 14.30 13.83 13.50 13.24 12.94 ~ 19 0
73 [MPB2015] 54082 V* 16 23 48.9212607972 -26 23 52.016471421 17.05 16.66 15.60   14.25 ~ 4 0
74 Cl* NGC 6121 SAW V59 V* 16 23 50.1353354247 -26 33 23.903613400 14.66 14.35 13.44 12.81 12.17 ~ 7 0
75 Cl* NGC 6121 SAW V79 V* 16 24 01.20 -26 21 56.2 16.74 16.18 15.07   13.69 ~ 2 0
76 CRTS J162407.6-263840 RR* 16 24 07.5758134822 -26 38 38.367533959 17.46 16.71 16.04 15.83 15.07 ~ 7 0
77 2MASS J16241666-2657131 Ce? 16 24 16.6507715317 -26 57 13.059111206           ~ 4 0
78 [SMH2016] NV8 RR* 16 24 28.4820264315 -26 28 28.616150285           ~ 2 0
79 Cl* NGC 6121 SAW V33 RR* 16 24 33.3278101104 -26 20 58.004499970 13.94 13.65 13.03 12.58 12.08 ~ 31 0
80 [SMH2016] NV5 EB* 16 24 38.6627840072 -26 44 24.111317377           ~ 2 0
81 [III2004] M 4 5 X 16 24 39 -26 44.3           ~ 2 0
82 [SMH2016] NV6 Y*? 16 24 44.2712189640 -26 46 18.276248453           ~ 2 0
83 CRTS J162459.2-265420 EB* 16 24 59.14 -26 54 20.7     14.43     ~ 2 0
84 Cl* NGC 6121 SAWV 43 Ro* 16 25 07.4486219651 -26 25 44.027192474 13.86 13.60 13.08     ~ 13 0
85 [SMH2016] NV4 EB* 16 25 09.48 -26 39 42.4           ~ 1 0
86 [SHM2017] J246.37175-26.28768 RR* 16 25 29.2133635984 -26 17 15.624587559     14.78     ~ 5 0
87 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 836 1
88 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1845 1
89 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12381 0
90 BD+41 3306 PM* 19 19 00.5488384064 +41 38 04.581624991 10.01 9.67 8.86 8.18 7.66 K0V 236 0
91 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 918 0
92 NGC 6811 OpC 19 37 17 +46 23.3   7.47 6.8     ~ 283 0
93 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 787 0
94 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1052 0
95 2MASS J21140802-2251358 BD* 21 14 08.02560 -22 51 35.8380           L7.5 87 0
96 CFBDS J214947-040308 BD* 21 49 47.20 -04 03 08.9           T7 27 0
97 V* SX Phe SX* 23 46 32.8929064612 -41 34 54.770795675   7.40 7.12     A3V 319 0
98 NAME Galactic Bulge reg ~ ~           ~ 3657 0
99 NAME Galactic Bar reg ~ ~           ~ 992 0

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2021.09.21-16:40:51

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