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. <Mon. Not. R. Astron. Soc., 373, 95-104 (2006)> =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-deg2 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☉ 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 Hα 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 Hα equivalent widths (>20Å), 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 9.3deg2 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, muα*cosδ (2) 70- 76 F7.3 mas/yr pmDE Proper motion along DE, muδ (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
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