NOAO >   Observing Info >   Approved Programs >   2004B-0491

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Proposal Information for 2004B-0491


PI: John R. Stauffer, Caltech, stauffer@ipac.caltech.edu
Address: Spitzer Science Center, 1200 E. California Blvd, Pasadena, CA 91125, USA

CoI: Luisa Rebull, Spitzer Science Center/Caltech
CoI: Constantine Deliyannis, University of Indiana
CoI: Burt Jones, UCO/Lick
CoI: David Barrado y Navascues, Laboratorio de Astrofisica Espacial y Fisica Fundamental
CoI: Steve Strom, NOAO
CoI: Marc Pinsonneault, Ohio State
CoI: Don Terndrup, Ohio State

Title: Rotation Velocities in Alpha Persei

Abstract: The physical mechanisms controlling the angular momentum loss rate, the coupling of matter and angular momentum between the outer convective envelope and the radiative core, and the coronal and chromospheric emission generated by rotation for low mass stars remain a matter of considerable debate. New observations of open clusters whose ages are in the time period when rotational evolution is rapid can provide strong constraints on theoretical models of this evolution (cf. Sills et al.\ 2000). We propose here to obtain new high resolution spectra for ~150 K and M dwarf candidate members of the ~80 Myr old Alpha Persei cluster, tripling the number of low mass members of this cluster with known v \sin i, chromospheric activity and lithium abundance. We will compare these data to a similar-sized database for the low mass members of the Pleiades, age ~120 Myr, and we will use these data to measure the angular momentum loss rate as a function of mass for (tau)=80 to (tau)=120 Myr, and the correlation between rotation, lithium abundance and mass at 80 Myr. We will compare these constraints to predictions of the YREC models, and use the differences to help guide our efforts to improve the models.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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