NOAO >   Observing Info >   Approved Programs >   2008B-0207

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Proposal Information for 2008B-0207


PI: Wenjin Huang, Caltech, wenjin@astro.caltech.edu
Address: Astronomy Department, MC 105-24, Pasadena, CA 91125, USA

CoI: Douglas Gies, Georgia State University
CoI: Virginia McSwain, Lehigh University

Title: Stellar Rotation of Nearby Field B-Stars

Abstract: Here we propose a spectroscopic survey of field B-type stars using the GoldCam Spectrometer on the Kitt Peak 2.1-m telescope. The primary goal of this survey is to understand why field B stars are slow rotators compared to those in open clusters. We plan to obtain blue spectra (4000-4900\AA) of roughly 300 field B stars that will make the size of the field sample comparable to our previously investigated cluster sample. The projected rotational velocities (V \sin i) will be derived using He I lines (4380 and 4471\AA) and/or a Mg II line (4481\AA) while the surface temperatures/gravities (indicating stellar evolutionary status) will be derived from the Balmer lines (H(delta), H(gamma), and H(beta)). This study will deepen our understanding of how angular momentum evolves during the forming era and the infant stage of massive stars.


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NOAO >   Observing Info >   Approved Programs >   2008B-0207

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