Rotational Velocities, Radii, and Spectral Types of Pre-Main Sequence Stars in NGC 2362

Details Rotational Velocities, Radii, and Spectral Types of Pre-Main Sequence Stars in NGC 2362 Rotational Velocities, Radii, and Spectral Types of Pre-Main Sequence Stars in NGC 2362

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..473h&link_type=abstract

NOAO Proposal ID #2008B-0473

Physics

Scientific paper

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 sin(i) values. Our sample includes ~ 100 stars with V=14.5-18.5 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 radial velocity measurements, to our knowledge, will be the first for the PMS stars in NGC 2362. Additionally, we wish to obtain low-resolution spectra of our targets for the purpose of spectral classification. This will provide an independent assessment of each star's radius by traditional means using L and T_eff.

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