Nolan R. Walborn, Hugues Sana, William D. Taylor, Sergio Simon-Diaz, Christopher J. Evans
The spectral and spatial characteristics of two special categories of O stars
found in the VFTS dataset are presented. One of them comprises very rapid
rotators, including several more extreme than any previously known. These
objects are distributed around the peripheries of the main 30 Doradus clusters,
suggesting a runaway nature for which their radial velocities already provide
preliminary supporting evidence. The other category consists of a large number
of Vz stars, previously hypothesized on spectroscopic grounds to be on or very
near the ZAMS. Their distribution is the inverse of that of the rapid rotators:
the Vz are strongly concentrated to the ionizing clusters, plus a newly
recognized band of recent and current star formation to the north, which
provides strong circumstantial evidence for their extreme youth.
View original:
http://arxiv.org/abs/1112.4435
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