Cluster survey of protoplanetary disk evolution

Details Cluster survey of protoplanetary disk evolution Cluster survey of protoplanetary disk evolution

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..199s&link_type=abstract

NOAO Proposal ID #2002B-0199

Physics

Scientific paper

We propose to identify cluster samples for studying disk evolution in the 3-10 Myr age range, the epoch during which planet formation is thought to occur. Based on studies of the high-mass members, and on our previous observations with Hydra, Tr 37 and NGC 7160 have ages of ~ 3-5 and ~ 10 Myr, respectively, so they are good clusters for our survey. We have selected 600 candidates in each cluster from photometry, which require spectroscopic followup with Hydra to confirm membership. Our previous limited observations have revealed the power of Hydra spectra to identify cluster members through the presence of two main spectral features, H(alpha) emission, related to accretion processes, and Li I 6707 Aabsorption, a characteristic feature of young, low-mass (late K and M types) stars. Our proposed Hydra observations will result in a sample of stars with well-established ages in the 3-10 Myr range for studies of disk evolution as a function of stellar mass and age.

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