Stellar Rotation: A Probe of Initial Star-Forming Conditions

Details Stellar Rotation: A Probe of Initial Star-Forming Conditions Stellar Rotation: A Probe of Initial Star-Forming Conditions

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sfet.confe..26s&link_type=abstract

"Star Formation in the Era of Three Great Observatories, meeting abstracts from the conference held July 13-15, 2005 in Cambridg

Computer Science

Scientific paper

Projected rotational velocities (vsini) have been measured for B stars in the rich, dense h and chi Persei double cluster along with 7 young (1-7 Myr age) clusters of intermediate density, and compared with the distribution of rotational velocities for a sample of field stars having similar ages. In comparison with stars populating the field (and presumably formed in low density environments), the observed rotation speeds among stars formed in denser cluster environments are consistently higher. Moreover, the cluster population lacks the large cohort of slow (vsini < 50 km/sec) stars found among field B stars. We argue that both the higher rotation rates and the pattern of rotation speeds that differentiate B stars in clusters from their field analogs were likely imprinted during the star formation process rather than a result of angular momentum evolution. We suggest that these differences may reflect the effects of the higher accretion rates that theory suggests are characteristic of regions that give birth to dense clusters, namely, (1) higher initial rotation speeds; and (2) higher initial radii along the stellar birth line, resulting in greater spin-up between the birth line and the ZAMS.

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