Hectospec and Hectochelle Spectroscopy of the Cep OB3b Cluster

Details Hectospec and Hectochelle Spectroscopy of the Cep OB3b Cluster Hectospec and Hectochelle Spectroscopy of the Cep OB3b Cluster

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..449a&link_type=abstract

NOAO Proposal ID #2009B-0449

Physics

Scientific paper

We have recently discovered over 1000 young stars in the Cep OB3b young cluster with the Spitzer Space Telescope; showing that CepOB3b is one of the two large (1000+ member), young (< 5 Myr), dense clusters within 1 Kpc of the Sun. It has largely dispersed its natal gas, suggesting it is more evolved than the Orion Nebula Cluster, and thus can provide a rare glimpse at the evolution of young large clusters. We have recently found that the stars in Cep OB3b closest to an O7V star preferentially lack disks, evidence that disk evaporation is ongoing in this cloud. We propose hectospec and hectochelle observations to measure the spectral types, accretion properties and radial velocities of the member stars. This will allow us to analyze the age and dynamics of the emerging cluster, and to study the photoevaporation of disks around stars orbiting in the cluster. These observations will also support 150 kiloseconds of Chandra Observations to study the X-ray properties of this young cluster.

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