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The 2MASS Wide-Field T Dwarf Search. II. Discovery of Three T Dwarfs in the Southern Hemisphere
We present the discovery of three new southern hemisphere T dwarfsidentified in the Two Micron All Sky Survey. These objects, 2MASS0348-6022, 2MASS 0516-0445, and 2MASS 2228-4310, have classificationsT7, T5.5, and T6.5, respectively. Using linear absolutemagnitude/spectral type relations derived from T dwarfs with measuredparallaxes, we estimate spectrophotometric distances for thesediscoveries; the closest, 2MASS 0348-6022, is likely within 10 pc of theSun. Proper motions and estimated tangential velocities are consistentwith membership in the Galactic disk population. We also list southernhemisphere T dwarf candidates that were either not found in subsequentnear-infrared imaging observations and are most likely uncataloged minorplanets, or have near-infrared spectra consistent with background stars.
| Four-colour and H BET photometry of some bright southern stars- II.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972MNRAS.160..155S&db_key=AST
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Observation and Astrometry data
| Constellation: | Octans |
| Right ascension: | 21h33m20.60s |
| Declination: | -80°02'21.0" |
| Apparent magnitude: | 6.47 |
| Distance: | 110.497 parsecs |
| Proper motion RA: | 23 |
| Proper motion Dec: | -22.8 |
| B-T magnitude: | 6.519 |
| V-T magnitude: | 6.471 |
Catalogs and designations:
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NEWS@SKY (Science&Space News)
