Probing the evolving massive star population in Orion with kinematic and radioactive tracers

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Table 1:

The 5 regions with massive stars in Orion.
Association	Stars ${>}2~M_{\odot}$	Age (rotating)	Age (non-rotating)	$M_{\rm up}$	Stars ${>}M_{\rm up}$	Distance
OB1a	160	12 Myr	10 Myr	18.5	7.3	330
OB1b	120	5.5 Myr	4.6 Myr	45	1.3	360
OB1c	140	5.5 Myr	4.6 Myr	45	1.5	400
OB1d	60	1 Myr	1 Myr	120	0	410
$\lambda$ Ori	60	5.5 Myr	4.6 Myr	45	0.65	450

Notes. Given are the estimated number of stars above 2 $M_{\odot }$ , the age for rotating and non-rotating models, the highest mass possible mass for stars at these ages, the estimated number of stars that has already exploded as supernovae and the distance.

Source LaTeX | All tables | In the text

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