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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
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) and Carretta &
    Gratton (1997A&AS..121...95C) scales.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table34.dat       49       72   Distances and reddening of globular clusters


See also:
 J/A+A/391/945 : HST photometry of 74 galactic globular clusters (Piotto+, 2002)


Byte-by-byte Description of file: table34.dat

   Bytes Format Units  Label      Explanations

   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) scale
  45- 49  F5.2  [Sun]  [Fe/H]CG   ? Metallicity in the Carretta & Gratton
                                   (1997A&AS..121...95C) scale


Acknowledgements:
    Alejandra Recio-Blanco, arecio(at)obs-nice.fr
(End) Alejandra Recio-Blanco [Obs. Cote d'Azur], P. Vannier [CDS]    20-Jun-2006