J/AJ/121/916 HST obs. of NGC 2298, 5897, 6535, and 6626 (Testa+, 2001)
Horizontal-branch morphology and dense environments: Hubble Space Telescope
observations of globular clusters NGC 2298, 5897, 6535, and 6626.
Testa V., Corsi C.E., Andreuzzi G., Iannicola G., Marconi G.,
Piersimoni A.M., Buonanno R.
<Astron. J., 121, 916-934 (2001)>
=2001AJ....121..916T 2001AJ....121..916T
ADC_Keywords: Clusters, globular ; Photometry, HST
Keywords: color-magnitude diagrams - globular clusters: general -
stars: horizontal-branch -
globular clusters: individual (NGC 2298, NGC 5897, NGC 6535, NGC 6626)
Abstract:
HST observations of the core of four galactic globular clusters
allowed us to obtain interesting clues about the influence of the
environment on the star distribution along the horizontal branch. The
chemical composition and the age of the target clusters have been
derived through a detailed analysis of the (V, V-I) color-magnitude
diagrams. The photometric metallicities have been found in close
agreement with the recent spectroscopic determinations.
Description:
The observational data set for the study of the very central region of
the four clusters of our sample was obtained during HST Cycle 6,
proposal 6625, using the WFPC2 and the two filters, F555W and F814W,
roughly corresponding to the standard Johnson V and I bands.
Objects:
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RA (2000) DE Designation(s)
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06 48 59.2 -36 00 19 NGC 2298 = C 0647-359 (table4a.dat)
15 17 24.5 -21 00 37 NGC 5897 = GCl 33 (table4b.dat)
18 03 50.7 -00 17 49 NGC 6535 = GCl 83 (table4c.dat)
18 24 32.9 -24 52 12 NGC 6626 = M 28 (table4d.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4a.dat 49 8751 Photometry of NGC 2298
table4b.dat 49 14397 Photometry of NGC 5897
table4c.dat 49 3637 Photometry of NGC 6535
table4d.dat 49 33972 Photometry of NGC 6626
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See also:
J/PASP/106/404 : NGC 6535 BV CCD photometry (Sarajedini, 1994)
Byte-by-byte Description of file: table4?.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Stellar identification in the cluster (1)
11- 17 F7.4 mag Vmag V band magnitude (F555W)
19- 29 F11.6 mag V-I ?=-999.99 (V-I) color index (F555W-F814W)
32- 39 F8.3 arcsec oRA Right Ascension offset (2)
42- 49 F8.3 arcsec oDE Declination offset (2)
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Note (1): The format is aaa-# where aaa is the observation code
and # is the star number on aaa. The observation codes are:
PC1 = WFPC planetary camera chip
WF2 = WFPC wide field chip 2
WF3 = WFPC wide field chip 3
WF4 = WFPC wide field chip 4
ESO = Ground based observation taken at ESO
Note (2): Offset from:
table4a (NGC 2298) RA = 06:48:59.2, DE = -36:00:19 (J2000)
table4b (NGC 5897) RA = 15:17:24.5, DE = -21:00:37 (J2000)
table4c (NGC 6535) RA = 18:03:50.7, DE = -00:17:49 (J2000)
table4d (NGC 6626) RA = 18:24:32.9, DE = -24:52:12 (J2000)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Sep-2006