J/MNRAS/373/95 ZYJHK survey of Upper Sco association (Lodieu+, 2006) ================================================================================ New members in the Upper Scorpius association from the UKIRT Infrared Deep Sky Survey Early Data Release. Lodieu N., Hambly N.C., Jameson R.F. =2006MNRAS.373...95L ================================================================================ ADC_Keywords: Clusters, open ; Photometry, infrared Keywords: techniques: photometric - techniques: spectroscopic - stars: low-mass, brown dwarfs - open clusters and associations: individual: Upper Scorpius - infrared: stars Abstract: We present the results of a 9.3-deg^2^ infrared (ZYJHK) survey in the Upper Scorpius association extracted from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey Early Data Release (Dye et al., 2006MNRAS.372.1227D). We have selected a total of 112 candidates from the (Z-J, Z) colour-magnitude diagram over the Z=12.5-20.5 magnitude range, corresponding to M=0.25-0.01M_{sun}_ at an age of 5Myr and a distance of 145pc. Additional photometry in J and K filters revealed most of them as reddened stars, leaving 32 possible members. Among them, 15 have proper motion consistent with higher-mass members from Hipparcos and optical spectra with strong H{alpha} in emission and weak gravity features. We have also extracted two lower-mass candidate members for which no optical spectra are in hand. Three members exhibit strong H{alpha} equivalent widths (>20{AA}), suggesting that they could still undergo accretion, whereas two other dwarfs show signs of chromospheric activity. The likelihood of the binarity of a couple of new stellar and substellar members is discussed as well. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 76 112 *All 112 photometric candidates selected from the (Z-J, Z) CMD in 9.3deg^2^ in the Upper Sco association. -------------------------------------------------------------------------------- Note on table2.dat: Stars identified as [LHJ2007] JHHMMSS.ss+DDMMSS.s in Simbad -------------------------------------------------------------------------------- See also: J/A+A/464/581 : Sco OB2 intermediate-mass stars (Kouwenhoven+, 2007) J/AJ/124/404 : Upper Sco OB association Lithium survey. II. (Preibisch, 2002) J/AJ/121/1040 : PMS members of upper Scorpius OB association (Preibisch+, 2001) http://surveys.roe.ac.uk/wsa : UKIDSS DR2 Home Page Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Right ascension (J2000) 4- 5 I2 min RAm Right ascension (J2000) 7- 11 F5.2 s RAs Right ascension (J2000) 13 A1 --- DE- Declination sign (J2000) 14- 15 I2 deg DEd Declination (J2000) 17- 18 I2 arcmin DEm Declination (J2000) 20- 23 F4.1 arcsec DEs Declination (J2000) 25- 30 F6.3 mag Zmag Z (0.8817um) magnitude from GCS (1) 32- 37 F6.3 mag Ymag Y (1.0305um) magnitude from GCS (1) 39- 44 F6.3 mag Jmag J (1.2483um) magnitude from GCS (1) 46- 51 F6.3 mag Hmag H (1.6313um) magnitude from GCS (1) 53- 58 F6.3 mag Kmag K (2.2010um) magnitude from GCS (1) 60- 67 F8.3 mas/yr pmRA Proper motion along RA, mu{alpha}*cos{delta} (2) 70- 76 F7.3 mas/yr pmDE Proper motion along DE, mu{delta} (2) -------------------------------------------------------------------------------- Note (1): GCS: UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey Note (2): Proper motions from GCS/2MASS cross-correlation for members and non-members. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 14-Aug-2007