The Great Austral Nearby Young Association

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dc.creatorTorres, C. A. O.
dc.creatorQuast, G. R.
dc.creatorde la Reza, R.
dc.creatorda Silva, L.
dc.creatorMelo, C. H. F.
dc.date2001-05-16
dc.date.accessioned2026-07-07T01:58:36Z
dc.date.available2026-07-07T01:58:36Z
dc.descriptionObserving 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 $\sim60°$ 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.
dc.descriptionlatex file, 5 pages, 3 figures, conference: Young Stars Near Earth: Progress and Prospects, ASP Conference Series ed:Ray Jayawardhana and Thomas Greene
dc.identifierhttps://arxiv.org/abs/astro-ph/0105291
dc.identifierhttp://arxiv.org/abs/astro-ph/0105291
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2781
dc.subjectAstrophysics
dc.titleThe Great Austral Nearby Young Association
dc.typetext

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