2008ApJ...686L..87B

Query : 2008ApJ...686L..87B

2008ApJ...686L..87B - Astrophys. J., 686, L87-L90 (2008/October-3)

On the relative distances of ω Centauri and 47 Tucanae.

BONO G., STETSON P.B., SANNA N., PIERSIMONI A., FREYHAMMER L.M., BOUZID Y., BUONANNO R., CALAMIDA A., CAPUTO F., CORSI C.E., DI CECCO A., DALL'ORA M., FERRARO I., IANNICOLA G., MONELLI M., NONINO M., PULONE L., STERKEN C., STORM J., TUVIKENE T. and WALKER A.R.

Abstract (from CDS):

We present precise optical and near-infrared ground-based photometry of two globular clusters (GCs): ω Cen and 47 Tuc. These photometric catalogs are unbiased in the red giant branch (RGB) region close to the tip. We provide new estimates of the RGB tip (TRGB) magnitudes–mI(TRGB)=9.84±0.05, ω Cen; mI(TRGB)=9.46±0.06, 47 Tuc–and use these to determine the relative distances of the two GCs. We find that distance ratios based on different calibrations of the TRGB, the RR Lyrae stars, and kinematic distances agree with each other within 1 σ. Absolute TRGB and RR Lyrae distance moduli agree within 0.10-0.15 mag, while absolute kinematic distance moduli are 0.2-0.3 mag smaller. Absolute distances to 47 Tuc based on the zero-age horizontal branch and on the white dwarf fitting agree within 0.1 mag, but they are 0.1-0.3 mag smaller than TRGB and RR Lyrae distances.

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Journal keyword(s): Galaxy: Globular Clusters: General - Galaxy: Globular Clusters: Individual: Name: ω Centauri - Galaxy: Globular Clusters: Individual: Name: 47 Tucanae

CDS comments: Parag. 3 : V9 in 47 Tuc = SV* HV 810

Simbad objects: 9

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Number of rows : 9
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 SV* HV 810 RR* 00 23 40.5541400088 -72 05 59.945381016   13.76 13.710   13.184 kF1hF4 53 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 Cl* NGC 5139 B V127 RR* 13 25 19.4312356080 -47 28 37.540600068 15.002 14.764 14.578 14.291 14.066 hA6.5 24 0
4 Cl* NGC 5139 SAW V136 RR* 13 26 31.0638722952 -47 27 40.906004868 15.121 14.729 14.437 14.304 13.898 ~ 19 0
5 Cl* NGC 5139 SAW V141 RR* 13 26 40.8697800912 -47 29 28.291982028 15.109 15.012 14.669 14.350 13.893 ~ 14 0
6 Cl* NGC 5139 B V90 RR* 13 26 45.766 -47 26 22.28 15.906 15.671 14.791 14.199 13.689 ~ 28 0
7 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
8 Cl* NGC 5139 B V87 RR* 13 26 57.4724362224 -47 25 35.654875536 15.033 14.905 14.616 14.392 13.949 ~ 25 0
9 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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