J/A+A/400/917 UBVI photometry in NGC 458 (Alcaino+, 2003)
The Small Magellanic Cloud star cluster NGC 458. A new UBVI photometric study.
Alcaino G., Alvarado F., Borissova J., Kurtev R.
<Astron. Astrophys. 400, 917 (2003)>
=2003A&A...400..917A 2003A&A...400..917A
ADC_Keywords: Magellanic Clouds ; Clusters, open ; Photometry, UBVRI
Keywords: stars: Hertzsprung-Russell (HR) and C-M diagrams -
galaxies: stellar content - galaxies: Magellanic clouds -
galaxies: individual: SMC - galaxies: stars clusters
Abstract:
We present a new photometry of the Small Magellanic Cloud star
cluster NGC 458 in UBVI filters. We determine the reddening
E(B-V)=0.04±0.02. By comparison with the isochrones by
Bertelli et al. (1994, Cat. J/A+AS/106/275) we derive an age
of ∼140Myr. Three candidate blue straggler stars are proposed.
The evolved "blue loop'' stars of NGC 458 have masses between
4 and 5M☉ and are hotter than model predictions.
Description:
Our analysis is based on a set of "blue" UB and "red" VI CCD frames
obtained in October 1999 with the 1.3m Warsaw telescope, Las Campanas
Observatory with the 2048x2048 CCD camera.
Objects:
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RA (2000) DE Designation(s)
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01 14 54 -71 33.0 NGC 458 = ESO 51- 26
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 5488 Photometry of NGC 458
table2.dat 91 30 Blue loop stars in NGC 458
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- AAB Sequential number (Cl* NGC 458 AAB NNNN)
7- 13 F7.2 pix Xpos X position (G1)
16- 22 F7.2 pix Ypos Y position (G1)
24- 29 F6.3 arcmin Dist Distance from cluster's center
32- 38 F7.3 mag U-B ?=100. U-B colour index
40- 46 F7.3 mag B-V ?=100. B-V colour index
48- 54 F7.3 mag V-I ?=100. V-I colour index
56- 61 F6.3 mag Vmag ?=2. V magnitude
63- 67 F5.3 mag e_Vmag rms uncertainty on Vmag
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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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2- 3 I2 --- BLS [1/30] Sequential number (Cl* NGC 458 BLS NN)
5- 11 F7.2 pix Xpos X position (G1)
13- 19 F7.2 pix Ypos Y position (G1)
21- 25 F5.3 arcmin Dist Distance from cluster's center
27- 33 F7.3 mag U-B ?=100.000 U-B colour index
35- 40 F6.3 mag B-V B-V colour index
42- 46 F5.3 mag V-I V-I colour index
48- 53 F6.3 mag Vmag V magnitude
55- 60 F6.3 mag Jmag J magnitude
62- 67 F6.3 mag Hmag H magnitude
69- 74 F6.3 mag Kmag K magnitude
76- 80 F5.3 mag V-K V-K colour index
82- 85 I4 K Teff Effective temperature
87- 91 F5.3 [solLum] log(L) Luminosity
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Global notes:
Note (G1): 1 pix = 0.417"
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 24-Apr-2003