NOAO >   Observing Info >   Approved Programs >   2011B-0540

Small NOAO Logo

Proposal Information for 2011B-0540


PI: Catrina Hamilton-Drager, Dickinson College, hamiltoc@dickinson.edu
Address: Physics Department, P.O. Box 1773, Carlisle, PA 17013, USA

CoI: Christopher Johns-Krull, Rice University

Title: Rotational Velocities of Pre-Main Sequence Stars in NGC 2362

Abstract: We wish to obtain high-resolution spectra for a large number of pre- main sequence (PMS) stars in NGC 2362 in order to measure v\thinspace sin(i) values. Our sample includes ~ 275 stars with V=16.5-19.5 for which accurate rotation periods are known from photometric monitoring. By combining rotation periods with projected velocities for this large sample of stars, we will be able to apply statistical arguments to arrive at estimates for the mean radii of the stars in NGC 2362. Stellar radii and rotational velocities are crucial fundamental parameters which constrain theoretical models describing PMS evolution, as well as magnetospheric accretion. Our method uses a novel approach for the estimation of stellar radii, which has already been successfully employed in the Orion Nebula Cluster (ONC), NGC 2264, and IC 348. As a part of the cross-correlation process, we plan to measure the target stars' radial velocities. These v\thinspace sin(i) and radial velocity measurements, to our knowledge, will be the first for the PMS stars in NGC 2362.


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



NOAO >   Observing Info >   Approved Programs >   2011B-0540

noaoprop-help@noao.edu

Small NOAO Logo