J/A+A/450/147 IzJHKs photometry of Collinder 359 (Lodieu+, 2006)
A deep wide-field optical survey in the young open cluster Collinder 359.
Lodieu N., Bouvier J., James D.J., de Wit W.-J., Palla F., McCaughrean M.J.,
Cuillandre J.-C.
<Astron. Astrophys. 450, 147 (2006)>
=2006A&A...450..147L 2006A&A...450..147L
ADC_Keywords: Clusters, open - Photometry, CCD ; Photometry, infrared
Keywords: Galaxy: open clusters and associations: individual: Collinder 359 -
stars: low-mass, brown dwarfs - techniques: photometric
Abstract:
We present the first deep, optical, wide-field imaging survey of the
young open cluster Collinder 359, complemented by near-infrared
follow-up observations. This study is part of a large programme aimed
at examining the dependence of the mass function on environment and
time. We have surveyed 1.6 square degrees in the cluster, in the I and
z filters, with the CFH12K camera on the Canada-France-Hawaii 3.6-m
telescope down to completeness and detection limits in both filters of
22.0 and 24.0mag, respectively. Based on their location in the optical
(I-z,I) colour-magnitude diagram, we have extracted new cluster member
candidates in Collinder 359 spanning 1.3-0.03M☉, assuming an age
of 60Myr and a distance of 450pc for the cluster. We have used the
2MASS database as well as our own near-infrared photometry to examine
the membership status of the optically-selected cluster candidates.
Comparison of the location of the most massive members in Collinder
359 in a (B-V,V) diagram with theoretical isochrones suggests that
Collinder 359 is older than Alpha Per but younger than the Pleiades.
We discuss the possible relationship between Collinder 359 and IC 4665
as both clusters harbour similar parameters, including proper motion,
distance, and age.
Description:
Catalogue of cluster member candidates in Collinder 359, assuming a
distance of 450pc and an age of 60Myr for the cluster. The total
number of sources is 506. The observations were conducted in the I and
z filters with the CFH12K wide-camera on the Canada-France-Hawaii
Telescope in June 2002. Five CFH12K fields (A to E) were observed
covering an area of 1.6 square degree in the cluster. The table
provides the coordinates (in J2000), the I and z magnitudes from the
optical survey as well as the infrared magnitudes from 2MASS when
available of all possible cluster members. The CFH12K field-of-view
and the identification number of each source is given as well.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 97 506 Possible cluster member candidates in the
open cluster Collinder 359
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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- 5 A5 --- --- [Cr359]
7- 25 A19 --- Cr359 IAU name, JHHMMSS.ss+DDMMSS.s (1)
27- 29 A3 --- FOV CFH12K field (A to E) and CCD number (0 to 11)
31- 35 I5 --- Number Identification number of the source
37- 38 I2 h RAh Right ascension (J2000.0)
40- 41 I2 min RAm Right ascension (J2000.0)
43- 47 F5.2 s RAs Right ascension (J2000.0)
49 A1 --- DE- Declination sign (J2000.0)
50- 51 I2 deg DEd Declination (J2000.0)
53- 54 I2 arcmin DEm Declination (J2000.0)
56- 59 F4.1 arcsec DEs Declination (J2000.0)
61- 66 F6.3 mag Imag I (822nm) magnitude from CFH12K
68- 73 F6.3 mag zmag z magnitude from CFH12K
75- 80 F6.3 mag Jmag ?=- J magnitude from 2MASS when available
82- 87 F6.3 mag Hmag ?=- H magnitude from 2MASS when available
89- 94 F6.3 mag Ksmag ?=- Ks magnitude from 2MASS when available
96- 97 A2 --- Memb? [Y NM] Membership
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Note (1): The numbering of the object conforms to the IAU convention.
The prefix used is Cr359 J for Collinder 359 at the J2000 equinox,
followed by the sexagesimal Right Ascension [hhmmss.ss] and
Declination [ddmmss.s].
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Acknowledgements: Nicolas Lodieu, nl41(at)star.le.ac.uk
(End) Nicolas Lodieu [Leicester Univ., UK] Patricia Vannier [CDS] 09-Jan-2006