J/AJ/109/663 BV photometry in Terzan 7 (Buonanno+ 1995)
Terzan 7: a young metal-rich globular cluster in the Milky Way
Buonanno R., Corsi C.E., Pulone L., Fusi Pecci F., Richer H.B.,
Fahlman G.C.
<Astron. J. 109, 663 (1995)>
=1995AJ....109..663B 1995AJ....109..663B
ADC_Keywords: Clusters, globular ; Photometry, CCD
Abstract:
The first extensive CCD color-magnitude diagram for the metal-rich
galactic globular cluster Terzan 7 is presented. All age indicators
derived from this diagram suggest that the cluster is young, about 70%
of the age of 47 Tuc, which has similar metallicity. A rich population
of blue straggler stars is also found in this cluster. With Terzan 7,
the anomaly of young clusters is thus extended to cover almost the
entire range of galactic globular cluster metallicities. Several
possibilities for the origin of young galactic globular clusters are
discussed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 29 1731 Magnitudes, colors, and positions of stars in
Terzan 7
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Objects:
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RA (2000) DE Designation(s)
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19 17 42 -34 39.4 Cl Terzan 7 = C 1914-347
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Star Star number
7- 11 F5.2 mag Vmag V magnitude
13- 17 F5.2 mag B-V B-V color
19- 23 I5 pix Xpos X pixel position (1)
25- 29 I5 pix Ypos Y pixel position (1)
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Note (1): The Xpos and Ypos coordinates are in pixels relative to the cluster
center. The location of this reference point was determined by
evaluating the unweighted means of the X and Y positions of the
stars falling within a radius of 300 pixels from a provisional
center fixed by eye, until the procedure has converged to a stable
value. A small subset of bright stars has been indicated in Fig. 1
of the printed paper to provide a reference grid for the
identification of the stars in Table 2.
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Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 26-Sep-1995
(End) [CDS] 09-Jan-1996