  A census of classical T Tauri stars and Herbig Ae/Be stars has been performed
around the Orion-Eridanus Superbubble which is ionized and created by the Ori
OB1 association. This sample is used to study the spatial distribution of
newborn stars, hence the recent star formation sequence, in the region that
includes two giant molecular clouds (Orion A and B) and additional smaller
clouds (NGC 2149, GN 05.51.4, VdB 64, the Crossbones, the Northern Filament,
LDN 1551, LDN 1558, and LDN 1563). Most of the molecular clouds are located on
the border of the Superbubble, and associated with H-alpha filaments and star
formation activity, except the Northern Filament which is probably located
outside the Superbubble. This suggests that while star formation progresses
from the oldest Ori OB1a subgroup to 1b, 1c and 1d, the Superbubble compresses
and initiates starbirth in clouds such as NGC 2149, GN 05.51.4, VdB 64, and the
Crossbones, which are located more than one hundred pc away from the center of
the Superbubble, and even in clouds some two hundred pc away, i.e., in LDN
1551, LDN 1558, and LDN 1563. A superbubble appears to have potentially a
long-range influence in triggering next-generation star formation in an OB
association.
