Table 2: Star formation regions of potential triggered origins.
Cloud
Spectral type of Projected distance from Estimated shock Evidence of triggered

main ionizing star ionizing star velocity star formation

Molecular pillars in M16¹ O5V 2 pc 1.3 ${\rm km~s^{-1}}$ age gradient of YSOs

IC1396N²
O6.5f 11 pc 0.6 ${\rm km~s^{-1}}$ age gradient of YSOs

SFO11, SFO11NE, SFO11E³
O6V 11 pc 1.4 ${\rm km~s^{-1}}$ on-going star formation

near ionization front

Orion bright-rimmed clouds⁴
O8III^a or O6:^b - - on-going star formation

near ionization front

^a Ionizing star of B30 and B35. ^b Ionizing star of IC2118, LDN1616, and LDN1634.
References: (1) Fukuda et al. (2002); White et al. (1999); (2) Getman et al. (2007);
(3) Thompson et al. (2004); (4) Lee et al. (2005).

**Table 2:** Star formation regions of potential triggered origins.
Cloud	Spectral type of	Projected distance from	Estimated shock	Evidence of triggered
	main ionizing star	ionizing star	velocity	star formation
Molecular pillars in M16¹	O5V	2 pc	1.3 ${\rm km~s^{-1}}$	age gradient of YSOs
IC1396N²	O6.5f	11 pc	0.6 ${\rm km~s^{-1}}$	age gradient of YSOs
SFO11, SFO11NE, SFO11E³	O6V	11 pc	1.4 ${\rm km~s^{-1}}$	on-going star formation
				near ionization front
Orion bright-rimmed clouds⁴	O8III^a or O6:^b	-	-	on-going star formation
				near ionization front

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