J/MNRAS/339/44 UBVRI photometry of Tr 14, Tr 15 and Tr 16 (Tapia+, 2003)
Imaging study of NGC 3372, the Carina nebula.
I. UBVRIJHK photometry of Tr 14, Tr 15, Tr 16 and Car I.
Tapia M., Roth M., Vazquez R.A., Feinstein A.
<Mon. Not. R. Astron. Soc., 339, 44-62 (2003)>
=2003MNRAS.339...44T 2003MNRAS.339...44T
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: stars: formation - HII regions - ISM: individual: NGC 3372 -
open clusters and associations: general
Abstract:
We present the results of a large-scale imaging photometric study of
the stellar population in the northern part of NGC 3372 in the
UBVRIJHK bands with a wavelength coverage from 0.33 to 2.5µm. The
observations were made at Las Campanas Observatory. The optical CCD
mosaics cover an area approximately of 32x22arcmin2 centred between
the Tr 14 and Tr 16 clusters. The survey was extended to cover
12x12arcmin2 at the location of Tr 15. Near-infrared NICMOS3 mosaics
covering the areas occupied by these clusters were obtained in the JHK
photometric bands. By means of star counts in V, the centres and sizes
of each cluster were redetermined yielding: Tr 14 (r=264"),
Tr 15 (r=320") and Tr 16 (r=320"). It was confirmed that Cr 232 is not
a true cluster. Multicolour optical photometry was obtained for 4152
stars. Two colour and colour-magnitude diagrams are presented and
analysed for each individual cluster and compared to those of the
field. We confirm the widespread variations in the dust density and
also in the dust size distribution leading to widely different values
of AVand reddening laws towards Tr 14 and Tr 16. No spatial patterns
were found for these variations. Spectroscopic parallaxes were
computed and the results are consistent with all three clusters being
at a similar distance from the Sun (=2.7kpc) but the data have
shown very large scatter in both AVand d. Analyses of the
extinction-corrected colour-magnitude diagrams suggest ages between 3
and 60 million years for the stars in Tr 15 and between less than 1
and 6 million years for Tr 14 and Tr 16. A small number of
infrared-excess stars were found in Tr 16 and Tr 14 but not in Tr 15.
The distribution of stars in Tr 14 seen in the near-infrared suggests
that this cluster is partially embedded in a molecular cloud. This
molecular cloud extends towards the west reaching its highest density,
marked by a CO peak emission, some three arcmin to the south-west of
the nucleus of Tr 14. The rich ultraviolet field created by the Tr 14
stars ionizes most of the visible HII region in its vicinity and most
of the radio HII region Car I. Evidence is found of ionization fronts
leading into the molecular cloud, which appears to be "wrapping" the
Tr 14 cluster. Deep JHK images of the Car I region reveal the presence
of an embedded stellar population illuminating a large infrared
reflection nebula. It includes at least one O9-B0 star associated with
an ultracompact HII region. Nebulous 2.2µm emission from three of
the mid-infrared sources in the Tr 14 region is also found.
Description:
UBVRI individual photometric measurements for all measured stars in
the clusters Tr 14, Tr 15 and Tr 16.
Objects:
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RA (ICRS) DE Designation(s) (files)
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10 43 55.4 -59 32 16 Tr 14 = Cl Trumpler 14 (tr14phot.dat)
10 44 40.8 -59 22 10 Tr 15 = Cl Trumpler 15 (tr15phot.dat)
10 45 10.6 -59 42 28 Tr 16 = Cl Trumpler 16 (tr16phot.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tr14phot.dat 47 284 Individual UBVRI photometry for Tr 14
tr15phot.dat 47 390 Individual UBVRI photometry for Tr 15
tr16phot.dat 47 369 Individual UBVRI photometry for Tr 16
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See also:
J/A+AS/116/75 : Region of the open cluster Tr 14 (Vazquez+, 1996)
J/AJ/105/980 : Stellar content of Tr 14 and Tr 16 (Massey+ 1993)
J/A+A/490/1055 : Tr 16 low-mass stars Chandra survey (Albacete-Colombo+, 2008)
J/AJ/143/41 : UBVIc CCD photometry of star clusters Tr14 & Tr16 (Hur+, 2012)
Byte-by-byte Description of file: tr14phot.dat tr15phot.dat tr16phot.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 10 F4.1 s RAs Right ascension (J2000.0)
12 A1 --- DE- Declination sign (J2000.0)
13- 14 I2 deg DEd Declination (J2000.0)
16- 17 I2 arcmin DEm Declination (J2000.0)
19- 20 I2 arcsec DEs Declination (J2000.0)
22- 26 F5.2 mag Vmag Johnson V magnitude
28- 31 F4.2 mag B-V Johnson B-V colour index
33- 37 F5.2 mag U-B ? Johnson U-B colour index
39- 42 F4.2 mag V-R Johnson-Cousins V-R colour index
44- 47 F4.2 mag R-I Cousins R-I colour index
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Acknowledgements:
Mauricio Tapia, mt(at)astrosen.unam.mx
(End) Mauricio Tapia [IA-UNAM], Patricia Vannier [CDS] 08-Apr-2015