J/A+A/430/941 Star formation region NGC 6530 (Prisinzano+, 2005)
The star formation region NGC 6530: Distance, ages and initial mass function.
Prisinzano L., Damiani F., Micela G., Sciortino S.
<Astron. Astrophys., 430, 941-957 (2005)>
=2005A&A...430..941P 2005A&A...430..941P
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Stars, pre-main sequence ;
X-ray sources
Keywords: Galaxy: open clusters and association: individual: NGC 6530 -
techniques: photometric - astrometry -
stars: pre-main sequence stars -
stars: Hertzprung-Russel (HR) and C-M diagrams
Abstract:
We present astrometry and BVI photometry, down to V∼22, of the very
young open cluster NGC 6530, obtained from observations taken with the
Wide Field Imager camera at the MPG/ESO 2.2m Telescope.
We have positionally matched our optical catalog with the list of
X-ray sources found in a Chandra-ACIS observation, finding a total of
828 common stars, 90% of which are pre-main sequence stars in
NGC 6530.
Description:
The data used in this work come from the combination of optical BVI
images taken with the Wide Field Imager (WFI) camera at the 2.2m
Telescope of the European Southern Observatory (ESO) made on 27-28 Jul
2000, a 60ks Chandra ACIS X-ray observation and public near-infrared
data from the All-Sky Catalog of Point Sources of the Two Micron All
Sky Survey (2MASS, Cat. II/24)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 161 797 Cross-identifications of this catalog with the
previous works of Walker (1957ApJ...125..636W 1957ApJ...125..636W),
Kilambi (1977MNRAS.178..423K 1977MNRAS.178..423K) and Sung et al.
(2000, Cat. J/AJ/120/333)
table5.dat 81 826 Cross-identifications of the optical catalog
with the X-ray source catalog of
Damiani et al. (2004ApJ...608..781D 2004ApJ...608..781D)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [WFI] Optical Catalog
5- 9 I5 --- ID WFI Identification number
11- 12 I2 h RAh Right Ascension (hours) (J2000.0)
14- 15 I2 min RAm Right Ascension (minutes) (J2000.0)
17- 21 F5.2 s RAs Right Ascension (seconds) (J2000.0)
23 A1 --- DE- Declination (sign) (J2000.0)
24- 25 I2 deg DEd Declination (degrees) (J2000.0)
27- 28 I2 arcmin DEm Declination (arcminutes) (J2000.0)
30- 34 F5.2 arcsec DEs Declination (arcseconds) (J2000.0)
36- 41 F6.3 mag Bmag ?=99.999 B magnitude
43- 47 F5.3 mag e_Bmag Error on B magnitude
49- 54 F6.3 mag Vmag V magnitude
56- 60 F5.3 mag e_Vmag Error on V magnitude
62- 67 F6.3 mag Icmag Cousins I magnitude
69- 73 F5.3 mag e_Icmag Error on Ic magnitude
75- 77 I3 -- SCB ?=999 Sung et al. (2000, Cat. J/AJ/120/333)
id. number, Cl* NGC 6530 SCB NNNN in Simbad
79- 87 F9.5 arcsec DRA1 ?=999.00000 Ascension Right residuals with
respect the Sung et al. (2000) catalog
89- 97 F9.5 arcsec DDE1 ?=999.00000 Declination residuals with
respect the Sung et al. (2000) catalog
99-105 F7.3 mag DVmag1 ?=999.000 Vmag residuals with respect to the
Sung et al. (2000) catalog
107-113 F7.3 mag D(B-V)1 ?=999.000 B-V residuals with respect to the
Sung et al. (2000) catalog
115-121 F7.3 mag D(V-I)1 ?=999.000 V-I residuals with respect to the
Sung et al. (2000) catalog
123-125 I3 -- NGC6530 ?=999 Walker-Kilambi (1957ApJ...125..636W 1957ApJ...125..636W &
1977MNRAS.178..423K 1977MNRAS.178..423K, NGC 6530 NNN in Simbad)
id. number
127-135 F9.5 arcsec DRA2 ?=999.00000 Ascension Right residuals with
respect the Walker-Kilambi catalog
137-145 F9.5 arcsec DDE2 ?=999.00000 Declination residuals with respect
to the Walker-Kilambi catalog
147-153 F7.3 mag DVmag2 ?=999.000 Vmag residuals with respect to the
Walker-Kilambi catalog
155-161 F7.3 mag D(B-V)2 ?=999.000 B-V residuals with respect to the
Walker-Kilambi catalog
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (hours) (J2000.0)
4- 5 I2 min RAm Right Ascension (minutes) (J2000.0)
7- 11 F5.2 s RAs Right Ascension (seconds) (J2000.0)
13 A1 --- DE- Declination (sign) (J2000.0)
14- 15 I2 deg DEd Declination (degrees) (J2000.0)
17- 18 I2 arcmin DEm Declination (arcminutes) (J2000.0)
20- 24 F5.2 arcsec DEs Declination (arcseconds) (J2000.0)
27- 29 A3 -- Cat Optical Catalog (WFI or SCB) (1)
31- 35 I5 -- ID Identification number
38- 43 F6.3 mag Bmag ?=99.999 B magnitude
45- 49 F5.3 mag e_Bmag Error on B magnitude
51- 56 F6.3 mag Vmag V magnitude
58- 62 F5.3 mag e_Vmag Error on V magnitude
64- 69 F6.3 mag Imag I magnitude
71- 75 F5.3 mag e_Imag Error on I magnitude
77- 79 I3 -- [DFM2004] Identification number in the Damiani et al.
(2004ApJ...608..781D 2004ApJ...608..781D) catalog
81 I1 -- Nopt Number of optical sources corresponding to
each X-ray detection
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Note (1): Nomenclature note:
SCB NNN = Cl* NGC 6530 SCB NNN in Simbad (Sung et al., J/AJ/120/333)
WFI : Wide Field Imager
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Acknowledgements: Loredana Prisinzano, loredana(at)astropa.unipa.it
History:
* 21-Feb-2005: Original version
* 02-Mar-2005: Columns Bmag and Vmag were interchanged in the description.
(End) Patricia Vannier [CDS] 21-Feb-2005