J/A+A/462/245 BVI photometry in NGC 6611 (Guarcello+, 2007)
Correlation between the spatial distribution of circumstellar disks and massive
stars in the open cluster NGC 6611. Compiled catalog and cluster parameters.
Guarcello M.G., Prisinzano L., Micela G., Damiani F., Peres G.,
Sciortino S.
<Astron. Astrophys., 462, 245-255 (2007)>
=2007A&A...462..245G 2007A&A...462..245G
ADC_Keywords: Clusters, open ; Photometry, UBVRI
Keywords: stars: formation - planetary systems: protoplanetary disks -
stars: pre-main sequence -
open cluster and associations: individual: NGC 6611 -
infrared: stars - X-ray: stars
Abstract:
The observation of young stars with circumstellar disks suggests that
the disks are dissipated, starting from the inner region, by the
radiation of the central star and eventually by the formation of rocky
planetesimals, over a time scale of several million years. It was also
shown that strong UV radiation emitted by nearby massive stars can
heat a circumstellar disk up to some thousand degrees, inducing the
photoevaporation of the gas. This process strongly reduces the
dissipation time scale. We study whether there exists a correlation
between the spatial distribution of stars with circumstellar disks and
the position of massive stars with spectral class earlier than B5, in
the open cluster NGC 6611.
We created a multiband catalog of the cluster, down to V∼23mag, using
optical data from a WFI observation at 2.2m of ESO in the BVI bands,
the 2MASS public point source catalog and an archival X-ray
observation made with CHANDRA/ACIS. We selected the stars with
infrared excess (due to the emission of a circumstellar disk) using
suitable color indices independent of extinction, and studied their
spatial distribution.
Description:
The optical data have been taken in the BVI bands with the Wield Field
Camera (WFI), mounted on the 2.2m telescope of the European Southern
Observatory (ESO) in La Silla (Chile).
The optical images used in this work were taken on 29 July 2000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 147 39143 Electronic multiband catalog (full catalog +
148 X-ray sources without optical or 2MASS
counterpart)
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+AS/134/525 : NGC 6611 compiled catalog (Belikov+ 1999)
J/AJ/106/1906 : NGC 6611: A Cluster Caught in the Act (Hillenbrand+ 1993)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Identification number, Cl* NGC 6611 GPM NNNNN
7- 16 F10.6 deg RAdeg Right ascension, in decimal degrees (J2000)
18- 27 F10.6 deg DEdeg Declination, in decimal degrees (J2000)
29- 35 F7.3 mag Bmag ?=999.000 WFI Johnson B magnitude
37- 43 F7.3 mag e_Bmag ?=999.000 rms uncertainty on Bmag
45- 51 F7.3 mag Vmag ?=999.000 WFI Johnson V magnitude
53- 59 F7.3 mag e_Vmag ?=999.000 rms uncertainty on Vmag
61- 67 F7.3 mag Icmag ?=999.000 WFI Cousins I magnitude
69- 75 F7.3 mag e_Icmag ?=999.000 rms uncertainty on Imag
77- 83 F7.3 mag Jmag ?=999.000 2MASS J magnitude
85- 91 F7.3 mag e_Jmag ?=999.000 rms uncertainty on Jmag
93- 99 F7.3 mag Hmag ?=999.000 2MASS H magnitude
101-107 F7.3 mag e_Hmag ?=999.000 rms uncertainty on Hmag
109-115 F7.3 mag Kmag ?=999.000 2MASS K magnitude
117-123 F7.3 mag e_Kmag ?=999.000 rms uncertainty on Kmag
125 I1 --- X [0/1] 1: star has an X-ray counterpart
127-133 F7.3 --- chi2 ?=999.000 chi2 parameter
135-141 F7.3 --- SHARP ?=999.000 SHARP parameter (2)
143-145 I3 --- M [0/1]?=999 1: star with multiple
identifications between the optical,
2MASS or CHANDRA catalogs (1)
147 I1 --- Flag [0/1] 1: possible optical spurious detections
near very bright stars
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Note (1): 999 for the 148 stars without counterpart identification.
Note (2): the SHARP parameter parameter is calculated in the source
detection procedure and takes into account the sharpness of the
source, allowing one to discard the extended sources and the events
due to cosmic rays (Stetson, 1987PASP...99..191S 1987PASP...99..191S)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Sep-2007