Next: Spectral Energy Distribution (SED)
Up: T Tauri Stars
Previous: T Tauri Stars
Infrared studies of T Tauri stars in star-forming regions have suggected
that initial disk frequency if rather high and that the disk lifetimes
are relatively short Myr.
From JHKL photometry, Haish, Lada, & Lada (2001) obtained the fraction
of disk-bearing stars for 6 star firmation regions.
L band excess emission indicates an accompanied disk.
The fraction is a decreasing function of age of the cluster as
in Figure 1.6.
This figure shows clearly that the disk fraction is initially very high
) and rapidly decreases with increasing cluster age.
In 3 Myr a half of the disk stars lose their disks.
Overall disk lifetime is estimated as Myr.
Fractions of IR excess sources in respective clusters are
plotted againt the age of the clusters.