PI: Thomas Allen, Lowell Observatory, firstname.lastname@example.org
Address: 1400 W Mars Hill Rd., Flagstaff, AZ 86001 USA
CoI: S T Megeath, U. of Toledo
CoI: Jakub Prchlik, Case Western Reserve U.
CoI: Nicole Karnath, U. of Toledo
CoI: Robert Gutermuth, U. Mass
CoI: Lori Allen, NOAO
CoI: Judy Pipher, Segev BenZvi
Title: Kosmos Spectroscopy of Cep OB3b
Abstract: Using a combination of Spitzer, Chandra and ground-based measurements, we have recently per- formed a census of young stars in the Cep OB3b cluster. These data show that CepOB3b is one of two known massive ($>$ 1000 members), young ($<$ 5 Myr), clusters within 1 Kpc of the Sun. Compared to the Orion Nebula Cluster, it has a similar in the number of members, but it has largely dispersed its natal gas, it has a median isochronal age of 3-4 Myr, and it has a disk fraction of 30\% (compared to 80\% in the ONC); these three lines indicate that the Cep OB3b is a more evolved counterpart to the Orion Nebula Cluster. We are now engaged in a large multi-wavelength study of Cep OB3b designed to study disk and cluster evolution. We propose KOSMOS observations needed to complete a study spectrally classifying the member stars. These data will allow us to analyze the dynamics of the emerging cluster, and to study the accretion properties of gas rich, 1-10 Myr disks. The observations will provide a unique snapshot of a massive young cluster emerging from its natal cloud. This is a continuation of NOAO Proposals 2009B-0449, 2010B-0436, 2011B-0472 and 2013A-0423.
Program Type: Standard/Galactic
Run 1 (2015B): KP-4m/KOSMOS -- 2.5n on Sep 18 - Sep 20 2015
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360