J/A+A/432/851 Distance of 72 Galactic globular clusters (Recio-Blanco+, 2005)
A homogeneous set of globular cluster relative distances and reddenings.
Recio-Blanco A., Piotto G., De Angeli F., Cassisi S., Riello M.,
Salaris M., Pietrinferni A., Zoccali M., Aparicio A.
<Astron. Astrophys., 432, 851-859 (2005)>
=2005A&A...432..851R 2005A&A...432..851R
ADC_Keywords: Clusters, globular ; Reddening ; Stars, distances
Keywords: Galaxy: globular clusters: general - stars: horizontal-branch -
stars: distances
Abstract:
We present distance modulus and reddening determinations for 72
Galactic globular clusters from the homogeneous photometric database
of Piotto et al. (2002, cat. J/A+A/391/945), calibrated to the HST
flight F439W and F555W bands. The distances have been determined by
comparison with theoretical absolute magnitudes of the ZAHB. For low
and intermediate metallicity clusters, we have estimated the apparent
Zero Age Horizontal Branch (ZAHB) magnitude from the RR Lyrae level.
For metal rich clusters, the ZAHB magnitude was obtained from the
fainter envelope of the red HB. Reddenings have been estimated by
comparison of the HST colour-magnitude diagrams (CMD) with ground CMDs
of template clusters with low reddening. The homogeneity of both the
photometric data and the adopted methodological approach allowed us to
obtain highly accurate relative cluster distances and reddenings. Our
results are also compared with recent compilations in the literature.
Description:
Description:
Apparent ZAHB F555W magnitude for 72 Galactic globular clusters,
corresponding distance modulus in F555W, the reddening in flight
system E(F439W-F555W) , the reddening in Johnson system E(B-V) and the
metallicity in the Zinn & West (1984ApJS...55...45Z 1984ApJS...55...45Z) and Carretta &
Gratton (1997A&AS..121...95C 1997A&AS..121...95C) scales.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table34.dat 49 72 Distances and reddening of globular clusters
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See also:
J/A+A/391/945 : HST photometry of 74 galactic globular clusters (Piotto+, 2002)
Byte-by-byte Description of file: table34.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster designation
10- 14 F5.2 mag m(ZAHB) Apparent F555W magnitude of the
Zero Age Horizontal Branch
16- 20 F5.2 mag (m-M) Distance modulus in F555W
22- 25 F4.2 mag e_(m-M) Error in distance modulus in F555W
27- 31 F5.3 mag E(HST) ? Reddening in flight system E(F439W-F555W)
33- 37 F5.3 mag E(B-V) ? Reddening in Johnson system E(B-V)
39- 43 F5.2 [Sun] [Fe/H]ZW ? Metallicity in the Zinn & West
(1984ApJS...55...45Z 1984ApJS...55...45Z) scale
45- 49 F5.2 [Sun] [Fe/H]CG ? Metallicity in the Carretta & Gratton
(1997A&AS..121...95C 1997A&AS..121...95C) scale
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Acknowledgements:
Alejandra Recio-Blanco, arecio(at)obs-nice.fr
(End) Alejandra Recio-Blanco [Obs. Cote d'Azur], P. Vannier [CDS] 20-Jun-2006