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J/AJ/114/1471 Fornax Globular 3 (Smith+ 1997)
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Fornax globular cluster 3: new color-magnitude diagrams
for cluster and surrounding field
Smith E.O., Michael R.R., Neill J.D.
<Astron. J. 114, 1471 (1997)>
=1997AJ....114.1471S
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ADC_Keywords: Clusters, globular ; Photometry, UBV
Abstract:
We present new B-V color-magnitude diagrams for Fornax globular
cluster 3 and the surrounding field where our data reach one magnitude
below the horizontal branch which is at V_HB_=21.28. After
subtracting the field stars from the cluster CMD, we found no evidence
for an intrinsic width of the red giant branch because the scatter is
only slightly wider than the photometric errors. We determine that
there is an intrinsic width to the horizontal branch because the
scatter is larger than the photometric errors. After comparing our
data with earlier photometry, we find 7 possible variable stars, both
within and outside the instability strip, out of a total of 74
horizontal branch stars. We calculate the horizontal branch type of
cluster 3 to be of intermediate color, -0.110+/-0.104, which when
compared to Fornax cluster 1, having similar metallicity, suggests a
second-parameter pair. Five carbon star candidates identified by
Jorgensen & Jimenez (1997, Cat. <J/A+A/317/54>) are marked in the
field-subtracted color-magnitude diagram.
(c) 1997 American Astronomical Society.
Objects:
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RA (2000) DE Designation(s)
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02 39.8 -34 16 Cluster 3 in Fornax
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 42 2698 *Fornax cluster 3 photometry
table3.tex 56 2724 AASTeX version of table3.dat
table3.ps 72 4182 PostScript version
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Note on table3.dat:
the numbering in the first column of table 4 disagrees with
the ID of table 3.
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See also:
J/A+A/317/54 : Fornax cluster 1 and 3 photometry (Jorgensen+ 1997)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Identification number (2)
6- 11 F6.1 pix Xpos X pixel coordinate (1)
13- 18 F6.1 pix Ypos Y pixel coordinate (1)
20- 24 F5.2 mag Vmag V magnitude
27- 30 F4.2 mag e_Vmag V error
32- 36 F5.2 mag B-V B-V color
39- 42 F4.2 mag e_B-V B-V error
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Note (1): North at the top and east to the left.
The image is 233" on a side and the center of the cluster in pixels is
at the position of (X, Y)=(675, 1214), RA=02h 37m 44s, DE=-34deg 28'
18". 1 pix = 0.43"
Note (2): This number disagrees with the first column of Table 4.
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Origin: AAS CD-ROM series, Volume 9, 1997 Lee Brotzman [ADS] 04-Nov-1997
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(End) [CDS] 05-Feb-1998