Mid-IR Variability of YSOs in the Large, Evolved, Young Cluster, Cep OB3b

Details Mid-IR Variability of YSOs in the Large, Evolved, Young Cluster, Cep OB3b Mid-IR Variability of YSOs in the Large, Evolved, Young Cluster, Cep OB3b

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80181g&link_type=abstract

Spitzer Proposal ID #80181

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Scientific paper

Cep OB3b is a rich young massive cluster similar in size and membership to the ONC, yet more evolved, less obscured, and ~3 Myr older. Cep OB3b and ONC are the only two such massive (> 1000 member) young clusters within 1 kpc of the Sun. Its age range of 3-5 Myr, in contrast to the ONC?s age < 2Myr, places Cep OB3b in the important 2-5 Myr period when disks are beginning to dissipate, dust is beginning to settle to the midplane, disk accretion rates onto the star decrease, and planet formation, especially giant planet formation, begins and may induce asymmetry to the inner disk wall. Throughout pre-main sequence evolution, variability is ubiquitous. These rapid changes to and in the disk during the 2-5 Myr period may result in signatures in both the period and amplitude of the variability. Thus we propose a mid-IR variability study of the Cep OB3b cluster to complement the YSOVAR variability study of the ONC. Because of Cep OB3b?s high ecliptic latitude, continuous monitoring over a 90-day observation window is possible, so that long period variables will not be missed. ONC, on the other hand, is restricted to a 40 day window. We plan to monitor approximately 400 YSOs in the 4-5 Myr population in Cep OB3b using a similar observing strategy to that employed for the ONC to facilitate comparison. Because Cep OB3b is not very obscured, for the most part, we have been able to obtain a vast complementary data set of medium and high resolution spectroscopic observations for over 1000 stars in the cluster, so that accretion rates and mass determinations (from spectral classifications) will be available to aid interpretation. Deep near-IR images, and Xray data on the cluster are also in hand, and Herschel observations are scheduled.

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