J/MNRAS/361/272 JHKs photometry of 4 Bulge globular clusters (Valenti+, 2005)
Near-Infrared photometry of four metal-rich Bulge globular clusters:
NGC 6304, NGC 6569, NGC 6637, NGC 6638.
Valenti E., Origlia L., Ferraro, F.R.
<Mon. Not. R. Astron. Soc. 361, 272 (2005)>
=2005MNRAS.361..272V 2005MNRAS.361..272V
ADC_Keywords: Clusters, globular ; Photometry, infrared
Keywords: techniques: photometric - infrared: stars -
globular clusters: individual (NGC 6304, NGC 6569, NGC 6637, NGC 6638)
Abstract:
We present high-quality near-infrared photometry of four bulge
metal-rich globular clusters, namely: NGC 6304, NGC 6569, NGC 6637 and
NGC 6638. By using the observed Colour-Magnitude Diagrams we derived a
photometric estimates of the cluster reddening and distance. We
performed a detailed analysis of the Red Giant Branch, presenting a
complete description of morphologic parameters and evolutionary
features (Bump and Tip). Photometric estimates of the cluster
metallicity have been obtained by using the updated set of relations
(published by our group) linking the metal abundance to a variety of
near-Infrared indices measured along the Red Giant Branch. The
detection of the Red Giant Branch Bump and the Tip is also presented
and briefly discussed.
Description:
The IR catalogs of the observed clusters are based on ground-based
observations using the near-IR camera SOFI@ESO/NTT equipped with a
1024x1024 Hawaii HgCdTe array detector. By using two different
magnifications: 0.146"/pix and 0.288"/pix a total FoV of 4.9'x4.9'
has been covered.
The instrumental magnitudes have been calibrated into the 2MASS
photometric system and astrometrically corrected by using 2MASS
catalogs (II/246), with an accuracy of <0.2".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table13.dat 72 4 Adopted parameters for the observed clusters
ngc6304.dat 66 9103 NGC 6304 IR Catalog
ngc6569.dat 66 10182 NGC 6569 IR Catalog
ngc6637.dat 66 12295 NGC 6637 IR Catalog
ngc6638.dat 66 10255 NGC 6638 IR Catalog
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
10- 11 I2 h RAh Right ascension (J2000.0)
13- 14 I2 min RAm Right ascension (J2000.0)
16- 19 F4.1 s RAs Right ascension (J2000.0)
21 A1 --- DE- Declination sign (J2000.0)
22- 23 I2 deg DEd Declination (J2000.0)
25- 26 I2 arcmin DEm Declination (J2000.0)
28- 29 I2 arcsec DEs Declination (J2000.0)
31- 36 F6.2 deg GLON Galactic longitude
38- 43 F6.2 deg GLAT Galactic latitude
45- 49 F5.2 mag VMAG Absolute V magnitude
51- 55 F5.2 [Sun] [Fe/H] Metallicity from Carretta & Gratton, 1997,
Cat. J/A+AS/121/95
57- 61 F5.2 [Sun] [M/H] Global metallicity (1)
63- 66 F4.2 mag E(B-V) Reddening
68- 72 F5.2 mag (m-M)0 Distance modulus
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Note (1): [M/H] = [Fe/H] +log(0.638fα+0.362), where fα is the
enhancement factor of the α elements.
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Byte-by-byte Description of file: ngc*.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- Seq Star sequential number in the cluster
11- 16 F6.3 mag Jmag J magnitude in 2MASS system (1.2µm)
21- 26 F6.3 mag Hmag H magnitude in 2MASS system (1.6µm)
31- 36 F6.3 mag Ksmag Ks magnitude in 2MASS system (2.2µm)
41- 51 F11.7 deg RAdeg Right Ascension J2000 , Epoch 1989.0 (degrees)
56- 66 F11.7 deg DEdeg Declination J2000 , Epoch 1989.0 (degrees)
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Acknowledgements: Elena Valenti, elena.valenti3(at)unibo.it
(End) Elena Valenti [Univ. Bologna], Patricia Vannier [CDS] 06-May-2005