J/MNRAS/418/1231 New brown dwarfs in upper Sco (Dawson+, 2011)
New brown dwarfs in the south part of the upper Scorpius association. Dawson P., Scholz A., Ray T.P. <Mon. Not. R. Astron. Soc., 418, 1231-1237 (2011)> =2011MNRAS.418.1231D
ADC_Keywords: Clusters, open ; Stars, late-type ; Infrared sources ; Photometry, infrared Keywords: techniques: photometric - open clusters and associations: individual: Upper Scorpius - infrared: stars Abstract: This paper presents the results of a search for brown dwarfs in the Upper Scorpius Association using data from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey. Candidate young brown dwarfs were first chosen by their position in colour magnitude diagrams with further selection based on proper motions to ensure Upper Scorpius membership. Proper motions were derived by comparing UKIDSS and Two Micron All Sky Survey (2MASS) data. Using that method we identify 19 new brown dwarfs in the southern part of the association. In addition there are up to eight likely members with slightly higher dispersion velocity. The ratio of brown dwarfs to stars was found to be consistent with other areas in Upper Scorpius. It was also found to be similar to other results from young clusters with OB associations, and lower than those without, suggesting the brown dwarf formation rate may be a function of environment. Description: The United Kingdom Infra-Red Telescope (UKIRT) is currently conducting the United Kingdom UKIDSS - the results of which are being made available in a series of releases. This work used the 8th Data Release (DR8Plus). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 95 6 Data for the 6 objects outside the range of Fig.4 table2.dat 95 28 *Data for the final objects selected
Note on table2.dat: Also included are the eight other objects shown in Fig.3 and lastly, the object too faint to be recorded in 2MASS.
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 25 A25 --- Name Name (2MASS JHHMMSSss+DDMMSSs or UGCS JHHMMSS.ss+DDMMSS.s) (1) 26 A1 --- n_Name [*] Note (2) 27- 28 I2 h RAh UKIDSS Right ascension (J2000, epoch≃2007.3) 30- 31 I2 min RAm UKIDSS Right ascension (J2000, epoch≃2007.3) 33- 37 F5.2 s RAs UKIDSS Right ascension (J2000, epoch≃2007.3) 39 A1 --- DE- UKIDSS Declination sing (J2000, epoch≃2007.3) 40- 41 I2 deg DEd UKIDSS Declination (J2000, epoch≃2007.3) 43- 44 I2 arcmin DEm UKIDSS Declination (J2000, epoch≃2007.3) 46- 49 F4.1 arcsec DEs UKIDSS Declination (J2000, epoch≃2007.3) 51- 55 F5.2 mag Zmag UKIDSS Z magnitude 57- 61 F5.2 mag Ymag UKIDSS Y magnitude 63- 67 F5.2 mag Jmag UKIDSS J magnitude 69- 73 F5.2 mag Hmag UKIDSS H magnitude 75- 79 F5.2 mag Kmag UKIDSS K magnitude 81- 87 F7.2 mas/yr pmRA ? Proper motion along RA (*cos(DE)) 89- 95 F7.2 mas/yr pmDE ? Proper motion along DE
Note (1): the published table use "2MASSJ" and "UGCSJ" designations; the 'J' is here attached to the position to conform to IAU nomenclature recommendations. Note (2): In table1, 2MASS J16035915-2806086 (contraction of 2MASS J16035915-2806104 and 2MASS J16035875-2806086) was a typo, corrected into 2MASS J16035875-2806086 by CDS.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Jun-2012
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