Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23r.103d&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p.103-103
Astronomy and Astrophysics
Astronomy
Scientific paper
Nearby associations or moving groups of Post-T Tauri stars with ages between 10 and 30 Myr are excellent objects for the study of the initial spin up phase during the PMS evolution. An empirical approach is made here to infer their rotation properties and relations to X-ray emission. Three associations with distances less than 100 pc are considered. The TW HYa association (TWA) with an age of 10 Myr, The Beta Pic Moving Group (BPMG) with an age of 12 Myr and a combination of Horologium and Tucana associations (30 Myr). Two high and low rotation modes are considered for each association corresponding to high mass (1.0-2.0 Mo) and low mass ( < = 1.0 Mo) respectively. Whereas the low mode practically doesn't change during this interval of ages, the high mode changes drastically. Following this, we propose that the high mode could be used as a fine tuning gyrochronometer for associations. The high mode difference between TWA and BPMG is particularly large and leaves us to consider that TWA could be younger than 10 Myr. A new age for TWA of < = 9 Myr is suggested admitting that the disks frequency decreases as 1/t. The two indicators of X-ray activity Lx and Lx/Lb present, for these three associations, a behavior similar as found for the younger T Tauri stars. The X-ray luminosities continue to be saturated, specially for the least massive components.
de La Reza Ramiro
Pinzon Giovanni
No associations
LandOfFree
On rotation of post-T Tauri stars in associations 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 On rotation of post-T Tauri stars in associations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On rotation of post-T Tauri stars in associations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1666309