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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 (http://ssd.jpl.nasa.gov/cgi-bin/sb_search)
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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