J/A+A/453/101 UBV(RI)c photometry of 4 open clusters (Lyra+, 2006)
On the difference between nuclear and contraction ages.
Lyra W., Moitinho A., van der Bliek N.S., Alves J.F.
<Astron. Astrophys. 453, 101 (2006)>
=2006A&A...453..101L 2006A&A...453..101L
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: Galaxy: open clusters and associations: general -
galaxies: star clusters - stars: formation -
techniques: photometric - Hertzsprung-Russell (HR) and C-M diagrams
Abstract:
Ages derived from the low mass stars still contracting onto the main
sequence often differ from ages derived from the high mass ones that
have already evolved away from it. We investigate the general claim of
disagreement between these two independent age determinations by
representing UBVRI photometry of the young galactic open clusters
NGC 2232, NGC 2516, NGC 2547 and NGC 4755, spanning the age range
∼10-150Myr.
Description:
Astrometry and CCD UBVRI photometry of the young open clusters
NGC2232, NGC2516, NGC2547 and NGC4755
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 94 1407 Photometric parameters for NGC 2232
table7.dat 94 3461 Photometric parameters for NGC 2516
table8.dat 94 12813 Photometric parameters for NGC 2547
table9.dat 94 7188 Photometric parameters for NGC 4755
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See also:
J/AJ/123/290 : UBVI CCD photometry of NGC 2516 (Sung+, 2002)
J/A+A/375/863 : Photometry in NGC 2516 (Jeffries+, 2001)
J/MNRAS/335/291 : BVI photometry of NGC 2547 (Naylor+, 2002)
J/MNRAS/351/1401 : RcIcZ photometry of NGC 2547 (Jeffries+, 2004)
J/A+A/369/511 : Open star clusters. III. NGC 4103, 5281, 4755 (Sanner+ 2001)
Byte-by-byte Description of file: table6.dat table7.dat table8.dat table9.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (J2000) (1)
4- 5 I2 min RAm Right Ascension (J2000) (1)
7- 11 F5.2 s RAs Right Ascension (J2000) (1)
13 A1 --- DE- Declination sign (J2000) (1)
14- 15 I2 deg DEd Declination (J2000) (1)
17- 18 I2 arcmin DEm Declination (J2000) (1)
20- 23 F4.1 arcsec DEs Declination (J2000) (1)
25- 30 F6.3 mag Umag ?=99.999 Johnson U magnitude
32- 38 F7.3 mag Bmag ?=99.999 Johnson B magnitude
40- 45 F6.3 mag Vmag ?=99.999 Johnson V magnitude
47- 52 F6.3 mag Rcmag ?=99.999 Cousins R magnitude
54- 59 F6.3 mag Icmag ?=99.999 Cousins I magnitude
61- 66 F6.3 mag e_Umag ?=99.999 Standard error for Umag
68- 73 F6.3 mag e_Bmag ?=99.999 Standard error for Bmag
75- 80 F6.3 mag e_Vmag ?=99.999 Standard error for Vmag
82- 87 F6.3 mag e_Rcmag ?=99.999 Standard error for Rcmag
89- 94 F6.3 mag e_Icmag ?=99.999 Standard error for Icmag
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Note (1): WCS (world coordinate system) astrometric solution is tied to the
system defined by the US Naval Observatory Guide Star Catalog of
Monet et al. (2003, Cat. I/284). The coordinates were calculated
using ESO's (European Southern Observatory) SKYCAT tool.
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Acknowledgements: Wladimir Lyra, wlyra(at)astro.uu.se
(End) Wladimir Lyra [UAO, Sweden], Patricia Vannier [CDS] 20-Mar-2006