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J/AJ/126/2487       T dwarfs in the southern hemisphere      (Burgasser+, 2003)

The 2MASS wide-field T dwarf search. II. Discovery of three T dwarfs in the southern hemisphere. Burgasser A.J., Mcelwain M.W., Kirkpatrick J.D. <Astron. J., 126, 2487-2494 (2003)> =2003AJ....126.2487B
ADC_Keywords: Infrared sources ; Stars, dwarfs ; Photometry, infrared Keywords: infrared radiation - solar neighborhood - stars: individual (2MASS J03480772-6022270, 2MASS J05160945-0445499, 2MASS J22282889-4310262) - stars: low-mass, brown dwarfs Abstract: We present the discovery of three new southern hemisphere T dwarfs identified in the Two Micron All Sky Survey (Cat. II/246). These objects, 2MASS 0348-6022, 2MASS 0516-0445, and 2MASS 2228-4310, have classifications T7, T5.5, and T6.5, respectively. Using linear absolute magnitude/spectral type relations derived from T dwarfs with measured parallaxes, we estimate spectrophotometric distances for these discoveries; the closest, 2MASS 0348-6022, is likely within 10pc of the Sun. Proper motions and estimated tangential velocities are consistent with membership in the Galactic disk population. We also list southern hemisphere T dwarf candidates that were either not found in subsequent near-infrared imaging observations and are most likely uncataloged minor planets, or have near-infrared spectra consistent with background stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 98 50 T dwarf candidates absent in follow-up OSIRIS images table2.dat 108 35 Results of OSIRIS spectroscopic observations
See also: II/241 : 2MASS Catalog Intermediate Data Release (IPAC/UMass, 2000) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [2MASS] 7- 23 A17 --- 2MASS 2MASS designation 25- 27 I3 deg beta Ecliptic latitude 29- 38 A10 "YYYY/MM/DD" Date 2MASS observation date 40- 44 F5.2 mag Jmag 2MASS J magnitude (G1) 46- 49 F4.2 mag e_Jmag rms uncertainty on Jmag 51- 55 F5.2 mag J-H 2MASS J-H colour index (G1) 57- 60 F4.2 mag e_J-H rms uncertainty on J-H 62 A1 --- l_H-Ks Limit flag on H-Ks 63- 67 F5.2 mag H-Ks 2MASS H-Ks colour index (G1) 69- 72 F4.2 mag e_H-Ks ? rms uncertainty on H-Ks 74- 83 A10 --- Ident Identification (1) 85- 98 A14 --- Com Comment
Note (1): Asteroid identifications are from the Small-Body Search tool maintained by the Jet Propulsion Laboratory Solar System Dynamics Group (
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 25 A25 --- Name Designation (2MASS or SDSS) 27- 31 F5.2 mag Jmag ? 2MASS J magnitude (G1) 33- 36 F4.2 mag e_Jmag ? rms uncertainty on Jmag 38- 42 F5.2 mag J-Ks ? 2MASS J-Ks colour index (G1) 44- 47 F4.2 mag e_J-Ks ? rms uncertainty on J-Ks 49- 58 A10 "YYYY/MM/DD" Date UT date 60- 63 I4 s Texp Exposition time 65- 68 F4.2 --- AirMass Air mass 70- 78 A9 --- Comp HD number of the calibrator 80- 85 A6 --- SpType Spectral type of the calibrator 88-107 A20 --- Type Type of the star 108 A1 --- n_Type [bc] Individual notes (1)
Note (1): Individual notes as follows: b = Candidate young brown dwarf in the Orion A complex (Strom et al., 1993ApJ...412..233S; Carpenter, 2000AJ....120.3139C). c = This object appeared much fainter at J band when imaged with OSIRIS than as observed by 2MASS. It is possible that the 2MASS source is a chance alignment with an uncataloged minor planet, or that this source is intrinsically variable.
Global notes: Note (G1): Photometry from the 2MASS EDR; note that some objects have revised photometry placing them outside of our original WPSD search constraints.
History: From electronic version of the journal References: Burgasser et al., Paper I 2003AJ....125..850B
(End) James Marcout, Patricia Bauer [CDS] 12-Jan-2004
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