J/AJ/101/1699 Photometry in globular cluster NGC 6229 (Carney+, 1991)
The distant globular cluster NGC 6229 and its relation to other outer halo
clusters.
Carney B.W., Fullton L.K., Trammell S.R.
<Astron. J., 101, 1699-1719 (1991)>
=1991AJ....101.1699C 1991AJ....101.1699C
ADC_Keywords: Clusters, globular ; Photometry, CCD
Abstract:
We present CCD-based BV photometry for over 1100 stars in and around
the globular cluster NGC 6229. For the first time, the cluster's
entire giant branch and its horizontal branch are delineated, from
which metallicity ([Fe/H]~-1.4) and distance (d☉_∼28kpc;
dGC∼27kpc) estimates ensue. NGC 6229 is found to have a relatively
blue horizontal branch for its intermediate metallicity, which is
unusual for an outer halo cluster. Its low R value (defined as
NHB/NRG) hints that the blue color of its horizontal branch is due
to a lower than average helium abundance. Three possible new variable
stars are identified, including one RR Lyrae and two long-period
variables. We present a brief review of our knowledge of basic data
for the 13 globular clusters lying more than 24 kpc from the Galactic
center. The unusually red horizontal branch phenomenon is common only
among the outermost clusters. An average R value for these clusters
suggests the effect is not caused by an overabundance of helium. The
Oosterhoff dichotomy apparently persists into the outer halo, although
the number of clusters with RR Lyrae variables is small.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 52 1102 *Photometric data
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Note on table3.dat: the star SZ IV-12 has been added at the end of table,
hence 1102 stars instead of 1101, see the Note (1) below.
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See also:
J/ApJ/102/17 : V light curves of variable stars in NGC 6229 (Baade+, 1945)
J/MNRAS/452/727 : NGC 6229 variable VI light curves (Arellano Ferro+, 2015)
J/other/MmSAI/31.187 : Light curves of 12 variables in NGC 6229 (Mannino, 1960)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Star [1/1101]? Star number (1)
6- 11 F6.2 pix Xpos X position (pixel)
13- 18 F6.2 pix Ypos Y position (pixel)
20- 24 F5.2 mag Vmag V-band magnitude
26- 30 F5.3 mag e_Vmag ? Error (1-σ) on Vmag
32- 36 F5.2 mag B-V (B-V) color
38- 42 F5.3 mag e_B-V ? Error (1-σ) on (B-V) color
44- 45 A2 --- --- [SZ]
47- 52 A6 --- SZ Designation in Searle and Zinn (1)
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Note (1): number of the star in Searle and Zinn (1978ApJ...225..357S 1978ApJ...225..357S),
taken from table4. SZ IV-2 had been added at CDS with a blank
"Star" number and the position given in section 2.4 of the paper
(this star "is not included in Table 3 because if did not pass the
'chi' test of all four frames).
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Nomenclature Notes:
Stars are name "Cl* NGC 6229 CFT" followed by the star number in
Simbad.
History:
Prepared via OCR at CDS, with tesseract-ocr (V3.03)
(End) Francois Ochsenbein [CDS] 17-Jun-2016