J/MNRAS/431/3222 UKIDSS GCS Upper Sco members (Lodieu, 2013)
Astrometric and photometric initial mass functions from the UKIDSS Galactic
Clusters Survey. IV. Upper Sco.
Lodieu N.
<Mon. Not. R. Astron. Soc. 431, 3222 (2013)>
=2013MNRAS.431.3222L 2013MNRAS.431.3222L
ADC_Keywords: Clusters, open ; Photometry, infrared ; Proper motions
Keywords: methods: observational - techniques: photometric - brown dwarfs -
stars: low-mass - stars: luminosity function, mass function -
open clusters and associations: individual: Upper Sco
Abstract:
We present the results of a proper motion wide-field near-infrared
survey of the entire Upper Sco (USco) association (about 160 square
degrees) released as part of the UKIRT Infrared Deep Sky (UKIDSS)
Galactic Clusters Survey (GCS) Data Release 10 (DR10). We have
identified a sample of about 400 astrometric and photometric member
candidates combining proper motions and photometry in five
near-infrared passbands and another 286 with HK photometry and
2MASS/GCS proper motions. We also provide revised membership for all
previously published USco low-mass stars and substellar members based
on our selection and identify new candidates, including in regions
affected by extinction. We find negligible variability between the two
K-band epochs, below the 0.06mag rms level. We estimate an upper
limit of 2.2% for wide common proper motions with projected physical
separations less than 15000AU. We derive a disk frequency for USco
low-mass stars and brown dwarfs between 26 and 37%, in agreement with
estimates in IC 348 and sigma Ori. We derive the mass function of the
association and find it consistent with the (system) mass function of
the solar neighbourhood and other clusters surveyed by the GCS in the
0.2-0.03M☉ mass range. We confirm the possible excess of brown
dwarfs in USco.
Description:
Table A1 lists the coordinates (J2000), near-infrared photometry
(ZYJHK), astrometry (proper motions in mas/yr), and the χ-square
fit for the sample of 201 USco member candidates in the GCS DR10 PM
region devoid of reddening, including known members previously
published in the literature.
Table B1 lists the coordinates (J2000), near-infrared photometry
(ZYJHK), astrometry (proper motions in mas/yr), and the χ-square
fit for the sample of 120 USco member candidates in the GCS DR10 PM
region affected by reddening, including known members previously
published in the literature.
Table C1 lists the coordinates (J2000), near-infrared photometry
(ZYJHK), and astrometry (proper motions in mas/yr) for the sample of
81 USco member candidates identified in the GCS Science Verification,
including known members previously published in the literature. The
proper motion measurements come from the 2MASS/GCS cross-match.
Table D1 lists the coordinates (J2000), near-infrared photometry (HK),
and astrometry (proper motions in mas/yr) for the sample of 286 USco
member candidates identified in the GCS DR10 HK-only region, including
known members previously published in the literature.
Table E1 lists the WISE all-sky mid-infrared photometry for USco
member candidates identified in GCS DR10.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 139 201 USco candidates from GCS DR10 pm region devoid
of reddening
tableb1.dat 139 120 USco candidates from GCS DR10 pm region affected
by reddening
tablec1.dat 107 81 USco candidates from GCS Science Verification
tabled1.dat 65 286 USco candidates from GCS HK-only
tablee1.dat 80 660 USco candidates from GCS with WISE photometry
table3.dat 44 4 Potential variable candidates in our USco
ZYJHK-pm sample of low-mass stars and brown dwarfs
--------------------------------------------------------------------------------
See also:
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
J/AJ/120/479 : Low-mass stars in the Upper Sco association (Ardila+, 2000)
J/ApJ/651/L49 : Upper Sco OB association IRAC observations (Carpenter+ 2006)
J/A+A/504/981 : Proper motions of cool stars in Upper Sco OB (Bouy+, 2009)
J/ApJ/703/1511 : Wide binaries in Taurus and Upper Sco (Kraus+, 2009)
J/ApJ/705/1646 : Debris disks in Upper Sco (Carpenter+, 2009)
J/AJ/139/1338 : UV-selected stars in Tau and Upper Sco (Findeisen+, 2010)
J/MNRAS/418/1231 : New brown dwarfs in upper Sco (Dawson+, 2011)
J/MNRAS/373/95 : ZYJHK survey of Upper Sco association (Lodieu+, 2006)
J/MNRAS/374/372 : ZYJHK photometry in Upper Sco (Lodieu+, 2007)
J/A+A/527/A24 : Spectra of low-mass stars in Upper Sco (Lodieu+, 2011)
J/MNRAS/422/1495 : UKIDSS GCS Pleiades members (Lodieu+ 2012)
J/MNRAS/426/3419 : UKIDSS GCS Praesepe members (Boudreault+ 2012)
J/MNRAS/426/3403 : UKIDSS GCS alpha Persei members (Lodieu+, 2012)
http://www.ukidss.org/surveys/surveys.html : UKIDSS Surveys
Byte-by-byte Description of file: tablea1.dat tableb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 11 F5.2 s RAs Right ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
17- 18 I2 arcmin DEm Declination (J2000.0)
20- 23 F4.1 arcsec DEs Declination (J2000.0)
25- 30 F6.3 mag Zmag UKIDSS Z-band magnitude
32- 37 F6.3 mag e_Zmag Error on the Z-band magnitude
39- 44 F6.3 mag Ymag ?=99.999 UKIDSS Y-band magnitude
46- 51 F6.3 mag e_Ymag ?=99.999 Error on the Y-band magnitude
53- 58 F6.3 mag Jmag UKIDSS J-band magnitude
60- 65 F6.3 mag e_Jmag Error on the J-band magnitude
67- 72 F6.3 mag Hmag UKIDSS H-band magnitude
74- 79 F6.3 mag e_Hmag Error on the H-band magnitude
81- 86 F6.3 mag K1mag UKIDSS K1-band magnitude from first epoch
88- 93 F6.3 mag e_K1mag Error on the K1-band magnitude
95-100 F6.3 mag K2mag UKIDSS K2-band magnitude from second epoch
102-107 F6.3 mag e_K2mag Error on the K2-band magnitude
109-114 F6.2 mas/yr pmRA Proper motion in right ascension
116-120 F5.2 mas/yr e_pmRA Error on the proper motion in right ascension
122-127 F6.2 mas/yr pmDE Proper motion in declination
129-133 F5.2 mas/yr e_pmDE Error on the proper motion in declination
135-139 F5.2 --- chi2 χ2 of the astrometric solution
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablec1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 11 F5.2 s RAs Right ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
17- 18 I2 arcmin DEm Declination (J2000.0)
20- 23 F4.1 arcsec DEs Declination (J2000.0)
25- 30 F6.3 mag Zmag UKIDSS Z-band magnitude
32- 37 F6.3 mag e_Zmag Error on the Z-band magnitude
39- 44 F6.3 mag Ymag ?=99.999 UKIDSS Y-band magnitude
46- 51 F6.3 mag e_Ymag ?=99.999 Error on the Y-band magnitude
53- 58 F6.3 mag Jmag UKIDSS J-band magnitude
60- 65 F6.3 mag e_Jmag Error on the J-band magnitude
67- 72 F6.3 mag Hmag UKIDSS H-band magnitude
74- 79 F6.3 mag e_Hmag Error on the H-band magnitude
81- 86 F6.3 mag K1mag UKIDSS K1-band magnitude from first epoch
88- 93 F6.3 mag e_K1mag Error on the K1-band magnitude
95-100 F6.2 mas/yr pmRA Proper motion in right ascension
102-107 F6.2 mas/yr pmDE Proper motion in declination
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tabled1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 11 F5.2 s RAs Right ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
17- 18 I2 arcmin DEm Declination (J2000.0)
20- 23 F4.1 arcsec DEs Declination (J2000.0)
25- 30 F6.3 mag Hmag UKIDSS H-band magnitude
32- 37 F6.3 mag e_Hmag Error on the H-band magnitude
39- 44 F6.3 mag Kmag UKIDSS K-band magnitude
46- 51 F6.3 mag e_Kmag Error on the K-band magnitude
53- 58 F6.2 mas/yr pmRA Proper motion in right ascension
60- 65 F6.2 mas/yr pmDE Proper motion in declination
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablee1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 11 F5.2 s RAs Right ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
17- 18 I2 arcmin DEm Declination (J2000.0)
20- 23 F4.1 arcsec DEs Declination (J2000.0)
25- 30 F6.3 mag W1mag WISE w1-band (3.35um) magnitude
32- 36 F5.3 mag e_W1mag Error on the w1-band magnitude
38- 43 F6.3 mag W2mag WISE w2-band (4.6um) magnitude
45- 49 F5.3 mag e_W2mag Error on the w2-band magnitude
51- 56 F6.3 mag W3mag WISE w3-band (11.6um) magnitude
58- 62 F5.3 mag e_W3mag Error on the w3-band magnitude
64- 69 F6.3 mag W4mag WISE w4-band (22.1um) magnitude
71- 75 F5.3 mag e_W4mag Error on the w4-band magnitude
77- 80 I4 --- Wdet WISE detection label, 0 or 1 for each band
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right ascension (J2000.0)
4- 5 I2 min RAm Right ascension (J2000.0)
7- 11 F5.2 s RAs Right ascension (J2000.0)
13 A1 --- DE- Declination sign (J2000.0)
14- 15 I2 deg DEd Declination (J2000.0)
17- 18 I2 arcmin DEm Declination (J2000.0)
20- 23 F4.1 arcsec DEs Declination (J2000.0)
25- 30 F6.3 mag K1mag UKIDSS K magnitude from first epoch
32- 37 F6.3 mag K2mag UKIDSS K magnitude from second epoch
39- 44 F6.3 mag K1-K2 K1-K2 magnitude difference
--------------------------------------------------------------------------------
Acknowledgements:
Nicolas Lodieu, nlodieu(at)iac.es
References:
Lodieu et al., Paper I 2012MNRAS.422.1495L 2012MNRAS.422.1495L, Cat. J/MNRAS/422/1495
Lodieu et al., Paper II 2012MNRAS.426.3403L 2012MNRAS.426.3403L, Cat. J/MNRAS/426/3403
Boudreault et al., Paper III 2012MNRAS.426.3419B 2012MNRAS.426.3419B, Cat. J/MNRAS/426/3419
(End) Patricia Vannier [CDS] 07-May-2013