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The Great Austral Nearby Young Association | | C. A. O. Torres
; G.R. Quast
; R. de la Reza
; L. da Silva
; C. H. F. Melo
; | | Date: |
17 May 2001 | | Subject: | astro-ph | | Abstract: | Observing ROSAT sources in an area covering $sim$30% of the Southern Hemisphere, we found evidences for a great nearby association (GAYA), comprising the proposed associations of Horologium (HorA) and the eastern part of Tucana (TucA), formed by at least 44 Post-T Tauri stars. The stars of the GAYA have similar space velocity components relative to the Sun (U, V, W) = ($-9.8 pm 1.2, -21.7 pm 1.1, -2.0 pm 2.2$) km/s and their Li line intensities are between those of the classical T Tauri stars and the ones of the Local Association stars. The distances of the members of the GAYA cover an interval of $sim$70 pc, compatible with the angular size of $sim60deg$ and in agreement with an initial velocity dispersion of $sim$1.5 km/s and its evolutive age. We found many other young stars, not members of the GAYA. We also observed a control region near the equator, covering 700 square degrees, where we found only four young stars. The overabundance of young stars near the South Pole (by a factor of five) seems to show that there may be other young associations not yet characterized. | | Source: | arXiv, astro-ph/0105291 | | Services: | Forum | Review | PDF | Favorites | |
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