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J/A+A/532/A103    Photometry and proper motions in IC4665       (Lodieu+, 2011)

The mass function of IC4665 revisited by the UKIDSS Galactic Clusters Survey. Lodieu N., de Wit W.J., Carraro G., Moraux E., Bouvier J., Hambly N.C. <Astron. Astrophys. 532, A103 (2011)> =2011A&A...532A.103L
ADC_Keywords: Clusters, open ; Photometry, infrared ; Proper motions ; Spectral types Keywords: techniques: photometric - stars: low-mass - brown dwarfs - stars: luminosity function, mass function - infrared: stars - open clusters and associations: individual: IC 4665 Abstract: Knowledge of the mass function in open clusters constitutes one way to constrain the formation of low-mass stars and brown dwarfs along with the knowledge of the frequency of multiple systems and the properties of disks. The aim of the project is to determine the shape of the mass function in the low-mass and substellar regimes in the pre-main sequence (27Myr) cluster IC4665 located at 350pc from the Sun. We have cross-matched the near-infrared photometric data from the Eighth Data Release (DR8) of the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS) with previous optical data obtained with the Canada-France-Hawaii (CFH) wide-field camera to improve the determination of the luminosity and mass functions in the low-mass and substellar regimes. The availability of i and z photometry taken with the CFH12K camera on the Canada France Hawaii Telescope added strong constraints to the UKIDSS photometric selection in this cluster located in a dense region of our Galaxy. We have derived the luminosity and mass functions of the cluster down to J=18.5mag, corresponding to masses of ∼0.025M at the distance and age of IC4665 according to theoretical models. In addition, we have extracted new candidate members down to ∼20 Jupiter masses in a previously unstudied region of the cluster. We have derived the mass function over the 0.6-0.04M mass range and found that it is best represented by a log-normal function with a peak at 0.25-0.16M, consistent with the determination in the Pleiades. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 125 493 Coordinates, photometry, proper motion, luminosity, and mass for confirmed optical candidates tableb1.dat 125 161 Coordinates, photometry and proper motion of 161 optical candidates rejected as members tablec1.dat 125 879 Coordinates, photometry and proper motion of new cluster member candidates from the GCS
See also: II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012) J/A+A/448/189 : IzJHK photometry of IC4665 (de Wit+, 2006) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 22 A22 --- Name Name following IAU nomenclature (G1) 24- 25 I2 h RAh Right ascension (J2000.0) 27- 28 I2 min RAm Right ascension (J2000.0) 30- 34 F5.2 s RAs Right ascension (J2000.0) 36 A1 --- DE- Declination sign (J2000.0) 37- 38 I2 deg DEd Declination (J2000.0) 40- 41 I2 arcmin DEm Declination (J2000.0) 43- 46 F4.1 arcsec DEs Declination (J2000.0) 48- 53 F6.3 mag imag I-band magnitude from the CFH12K 55- 60 F6.3 mag zmag z-band magnitude from the CFH12K 62- 67 F6.3 mag Zmag UKIDSS/Z-band magnitude from UKIDSS GCS DR8 69- 74 F6.3 mag Ymag UKIDSS/Y-band magnitude from UKIDSS GCS DR8 76- 81 F6.3 mag Jmag UKIDSS/J-band magnitude from UKIDSS GCS DR8 83- 88 F6.3 mag Hmag UKIDSS/H-band magnitude from UKIDSS GCS DR8 90- 95 F6.3 mag Kmag UKIDSS/K-band magnitude from UKIDSS GCS DR8 97-104 F8.2 mas/yr pmRA Proper motion in right ascension 106-113 F8.2 mas/yr pmDE Proper motion in declination 115-119 F5.2 [Lsun] logL Star luminosity 121-125 F5.3 Msun Mass Star mass
Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 22 A22 --- Name Name following IAU nomenclature (G1) 24- 25 I2 h RAh Right ascension (J2000.0) 27- 28 I2 min RAm Right ascension (J2000.0) 30- 34 F5.2 s RAs Right ascension (J2000.0) 36 A1 --- DE- Declination sign (J2000.0) 37- 38 I2 deg DEd Declination (J2000.0) 40- 41 I2 arcmin DEm Declination (J2000.0) 43- 46 F4.1 arcsec DEs [0/60] Declination (J2000.0) 48- 53 F6.3 mag imag I-band magnitude from the CFH12K 55- 60 F6.3 mag zmag z-band magnitude from the CFH12K 62- 67 F6.3 mag Zmag ?=99.999 UKIDSS/Z-band magnitude from GCS DR8 69- 74 F6.3 mag Ymag UKIDSS/Y-band magnitude from UKIDSS GCS DR8 76- 81 F6.3 mag Jmag UKIDSS/J-band magnitude from UKIDSS GCS DR8 83- 88 F6.3 mag Hmag UKIDSS/H-band magnitude from UKIDSS GCS DR8 90- 95 F6.3 mag Kmag UKIDSS/K-band magnitude from UKIDSS GCS DR8 97-104 F8.2 mas/yr pmRA Proper motion in right ascension 106-113 F8.2 mas/yr pmDE Proper motion in declination 115-119 F5.2 [Lsun] logL ? Star luminosity 121-125 F5.3 Msun Mass ? Star mass
Byte-by-byte Description of file: tablec1.dat
Bytes Format Units Label Explanations
1- 22 A22 --- Name Name following IAU nomenclature (G1) 24- 25 I2 h RAh Right ascension (J2000.0) 27- 28 I2 min RAm Right ascension (J2000.0) 30- 34 F5.2 s RAs Right ascension (J2000.0) 36 A1 --- DE- Declination sign (J2000.0) 37- 38 I2 deg DEd Declination (J2000.0) 40- 41 I2 arcmin DEm Declination (J2000.0) 43- 46 F4.1 arcsec DEs [0/60] Declination (J2000.0) 48- 53 F6.3 mag Zmag UKIDSS/Z-band magnitude from UKIDSS GCS DR8 55- 60 F6.3 mag Ymag UKIDSS/Y-band magnitude from UKIDSS GCS DR8 62- 67 F6.3 mag Jmag UKIDSS/J-band magnitude from UKIDSS GCS DR8 69- 74 F6.3 mag Hmag UKIDSS/H-band magnitude from UKIDSS GCS DR8 76- 81 F6.3 mag Kmag UKIDSS/K-band magnitude from UKIDSS GCS DR8 83- 89 F7.2 mas/yr pmRA ?=99.99 Proper motion in right ascension 91- 97 F7.2 mas/yr pmDE ?=99.99 Proper motion in declination 115-119 F5.2 [Lsun] logL ? Star luminosity 121-125 F5.3 Msun Mass ? Star mass
Global notes: Note (G1): Names as HH:MM:SS.ss+DD:MM:SS.s, idenfied as <UGCS JHHMMSS.ss+DDMMSS.s> in Simbad.
Acknowledgements: Nicolas Lodieu, nlodieu(at)iac.es
(End) Nicolas Lodieu [IAC Tenerife, Spain], Patricia Vannier [CDS] 09-Jun-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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