Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-05-16
Astronomy and Astrophysics
Astrophysics
latex file, 5 pages, 3 figures, conference: Young Stars Near Earth: Progress and Prospects, ASP Conference Series ed:Ray Jayaw
Scientific paper
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 $\sim60\deg$ 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.
da Silva Licio
la Reza Ramiro de
Melo Claudio H. F.
Quast Germano R.
Torres Carlos A. O.
No associations
LandOfFree
The Great Austral Nearby Young Association does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Great Austral Nearby Young Association, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Great Austral Nearby Young Association will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-184464