2014ApJS..210....6L

Query : 2014ApJS..210....6L

2014ApJS..210....6L - Astrophys. J., Suppl. Ser., 210, 6 (2014/January-0)

Toward a better understanding of the distance scale from RR Lyrae variable stars: a case study for the inner halo globular cluster NGC 6723.

LEE J.-W., LOPEZ-MORALES M., HONG K., KANG Y.-W., POHL B.L. and WALKER A.

Abstract (from CDS):

We present BV photometry for 54 variables in the metal-rich inner halo globular cluster NGC 6723. With the discovery of new RR Lyrae variables (RRLs), we obtain ab> = 0.541±0.066 and c> = 0.292±0.030 day, n(c)/n(ab+c) = 0.167, and int= 15.459±0.055. We carry out the Fourier decomposition analysis and obtain [Fe/H]ZW= -1.23±0.11 and E(B - V) = 0.063±0.015 for NGC 6723. By calibrating the zero point from the recent absolute trigonometric parallax measurements for RR Lyr, we derive the revised MV(RR)-[Fe/H] relation, providing MV(RR) = 0.52 at [Fe/H] = -1.50 and (m - M)0= 18.54 for the Large Magellanic Cloud, in excellent agreement with others. We obtain (m - M)0= 14.65±0.05, equivalent to a distance from the Sun of 8.47±0.17 kpc, for NGC 6723 from various distance measurement methods using RRLs. We find that RRLs in NGC 6723 do not have magnitude dependency on the radial distance because there is not a severe degree of apparent crowdedness. Finally, we show that a relation exists between the degree of photometric contamination and the apparent crowdedness of the central region of globular cluster systems, |µ - µr|∝ logρcd2. The use of this relation can play a significant role in mitigating the discrepancy in establishing a cosmic distance scale using RRLs in resolved stellar populations in near-field cosmology.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual: NGC 6723 - stars: distances - stars: horizontal-branch - stars: variables: RR Lyrae

Nomenclature: Table 3: [LLH2014] NVNN (Nos NV1-NV22) = Cl* NGC 6723 SAW VNN N=15 (Nos V33-V47) added.

Simbad objects: 67

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Number of rows : 67
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 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
2 V* SU Dra RR* 11 37 56.6071282968 +67 19 47.060102316 9.52 9.37 9.27     kA2.5hA9.5 264 0
3 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
4 V* UV Oct RR* 16 32 25.5361202856 -83 54 10.495880892   9.80 9.44     A8/F0Ia/ab(w) 133 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
6 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
7 2MASS J18590315-3644090 EB* 18 59 03.1692656760 -36 44 09.025733220   16.354 15.630     ~ 1 0
8 Cl* NGC 6723 SAW V3 RR* 18 59 12.9684251448 -36 37 46.172878320   15.889 15.497     ~ 5 0
9 Cl* NGC 6723 SAW V27 RR* 18 59 15.1114626552 -36 36 14.548972248   15.871 15.425     ~ 7 0
10 2MASS J18591691-3635203 LP* 18 59 16.9237747560 -36 35 20.339497824           ~ 6 0
11 Cl* NGC 6723 SAW V19 RR* 18 59 19.2595074816 -36 39 47.561749236   15.919 15.498     ~ 8 0
12 Cl* NGC 6723 SAW V18 RR* 18 59 21.8774585496 -36 38 13.326584172   15.923 15.504     ~ 9 0
13 [LLH2014] NV16 dS* 18 59 24.9174500400 -36 45 58.280989500   16.723 16.418     ~ 1 0
14 [LLH2014] NV18 dS* 18 59 25.127 -36 36 59.46   16.919 16.625     ~ 1 0
15 Cl* NGC 6723 SAW V15 RR* 18 59 25.5722420112 -36 35 06.345092760   15.770 15.415     ~ 8 0
16 Cl* NGC 6723 SAW V21 RR* 18 59 26.7895137936 -36 38 22.968465612   15.884 15.439     ~ 3 0
17 Cl* NGC 6723 SAW V22 RR* 18 59 27.3864329634 -36 37 17.372328209   15.848 15.511     ~ 5 0
18 Cl* NGC 6723 SAW V31 RR* 18 59 28.0706465640 -36 38 51.895387104   15.932 15.478     ~ 4 0
19 [LLH2014] NV4 RR* 18 59 29.2994760000 -36 37 52.169075112   15.829 15.436     ~ 1 0
20 Cl* NGC 6723 SAW V16 RR* 18 59 29.4615531264 -36 36 19.964856960   15.774 15.324     ~ 7 0
21 Cl* NGC 6723 SAW V13 RR* 18 59 29.4937854624 -36 39 02.744230860   15.996 15.595     ~ 6 0
22 Cl* NGC 6723 SAW V32 RR* 18 59 29.8656047304 -36 39 27.143483004   15.672 15.403     ~ 5 0
23 [LLH2014] NV6 RR* 18 59 30.1759791888 -36 37 45.000568010   15.890 15.449     ~ 3 0
24 Cl* NGC 6723 SAW V14 RR* 18 59 30.2193173792 -36 38 34.339036479   15.727 15.279     ~ 6 0
25 [LLH2014] NV1 RR* 18 59 30.27 -36 38 02.3   15.135 14.736     ~ 1 0
26 [LLH2014] NV5 RR* 18 59 30.79 -36 37 44.8   15.866 15.439     ~ 1 0
27 [LLH2014] NV11 RR* 18 59 30.9739918416 -36 38 32.368728228   15.885 15.554     ~ 3 0
28 [LLH2014] NV10 RR* 18 59 32.03 -36 37 40.4   15.963 15.536     ~ 1 0
29 Cl* NGC 6723 SAW V44 RR* 18 59 32.3527824794 -36 37 52.049274941   15.944 15.571   15.08 ~ 5 0
30 Cl* NGC 6723 SAW V35 RR* 18 59 32.9681033424 -36 38 01.542735449   15.846 15.365   14.80 ~ 4 0
31 Cl* NGC 6723 SAW V5 RR* 18 59 32.9878048104 -36 37 01.537989780   15.945 15.491     ~ 6 0
32 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
33 Cl* NGC 6723 SAW V34 RR* 18 59 33.1942608450 -36 37 58.141701170   15.743 15.351   14.85 ~ 4 0
34 Cl* NGC 6723 SAW V20 RR* 18 59 33.6708959136 -36 37 13.971879984   15.799 15.426     ~ 3 0
35 Cl* NGC 6723 SAW V6 RR* 18 59 33.9067480170 -36 37 05.374381877   15.882 15.494     ~ 5 0
36 Cl* NGC 6723 SAW V28 RR* 18 59 34.2539188584 -36 39 12.795325380   15.910 15.511     ~ 6 0
37 Cl* NGC 6723 SAW V29 RR* 18 59 34.39 -36 36 51.5   15.898 15.493     ~ 3 0
38 Cl* NGC 6723 SAW V8 RR* 18 59 34.678 -36 37 42.33   15.874 15.475   15.08 ~ 4 0
39 Cl* NGC 6723 SAW V4 RR* 18 59 34.7096424072 -36 36 34.704548784   15.890 15.517     ~ 7 0
40 [LLH2014] NV13 RR* 18 59 35.3849862393 -36 38 24.112250771   15.993 15.601     ~ 3 0
41 [LLH2014] NV8 RR* 18 59 35.6734505184 -36 37 52.195141380   15.973 15.511     ~ 1 0
42 [LLH2014] NV7 RR* 18 59 35.7940940921 -36 37 23.252350057   15.736 15.452     ~ 2 0
43 Cl* NGC 6723 SAW V17 RR* 18 59 36.9567859632 -36 39 33.519425364   15.976 15.549     ~ 4 0
44 Cl* NGC 6723 SAW V12 RR* 18 59 37.08 -36 38 36.5   15.921 15.535     ~ 4 0
45 Cl* NGC 6723 SAW V23 RR* 18 59 37.8316214424 -36 38 04.986336588   15.961 15.490     ~ 3 0
46 Cl* NGC 6723 SAW V9 RR* 18 59 39.495 -36 37 34.59   15.810 15.376     ~ 3 0
47 Cl* NGC 6723 SAW V1 RR* 18 59 39.6309271560 -36 41 09.109157640   16.037 15.590     ~ 4 0
48 2MASS J18594052-3638089 RR* 18 59 40.5048488429 -36 38 08.914850376   16.000 15.512     ~ 3 0
49 [LLH2014] NV19 SX* 18 59 41.07 -36 38 01.7   17.969 17.645     ~ 1 0
50 2MASS J18594154-3634321 LP* 18 59 41.5405203168 -36 34 32.195805672           ~ 6 0
51 Cl* NGC 6723 SAW V24 RR* 18 59 43.1369718816 -36 39 44.971357788   15.832 15.512     ~ 5 0
52 Cl* NGC 6723 SAW V11 RR* 18 59 44.5278185592 -36 34 02.071879968   15.925 15.497     ~ 7 0
53 Cl* NGC 6723 SAW V2 RR* 18 59 44.5672201320 -36 39 08.790214608   15.874 15.482     ~ 3 0
54 Cl* NGC 6723 SAW V10 RR* 18 59 45.6985027920 -36 36 27.402605280   15.731 15.476     ~ 7 0
55 Cl* NGC 6723 SAW V7 RR* 18 59 49.7780324688 -36 39 01.038713508   15.857 15.525     ~ 7 0
56 2MASS J18595109-3642064 EB* 18 59 51.0916862712 -36 42 06.514357428   17.297 16.591     ~ 1 0
57 2MASS J18595506-3637309 RR* 18 59 55.0639904088 -36 37 31.020630060   16.138 15.630     ~ 3 0
58 [LLH2014] NV22 EB* 18 59 55.1088129960 -36 48 18.758296656   19.494 18.736     ~ 2 0
59 2MASS J19000157-3637054 TT* 19 00 01.5743588376 -36 37 05.510254656   15.19 13.93     M2.25 33 0
60 2MASS J19000678-3647328 EB* 19 00 06.8301757632 -36 47 32.729598096   18.411 17.763     ~ 2 0
61 [LLH2014] NV21 EB* 19 00 07.8593072544 -36 47 52.279672704   19.620 18.448     ~ 2 0
62 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
63 V* RR Lyr RR* 19 25 27.9129605304 +42 47 03.693258204   7.36   7.6   kA3hF0 951 0
64 V* XZ Cyg RR* 19 32 29.3050827744 +56 23 17.494181700   9.94 9.68     kA1.5hA8 268 0
65 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
66 V* RZ Cep RR* 22 39 13.1768504856 +64 51 30.611384316   9.48 9.49 9.3   kA0.5hF0.5 168 0
67 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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