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Low-Mass Young Stars in Cep OB2: Ages, Distribution and Accretion Disks |
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| Authors: | Aurora Sicilia-Aguilar Lee Hartmann César Briceño María Eugenia Contreras James Muzerolle Nuria Calvet |
| Institution: | 1. Smithsonian Astrophysical Observatory, Cambridge, MA, U.S.A 2. Centro de Investigaciones de Astronomía, Venezuela 3. Universidad Autónoma de México, Mexico 4. University of Arizona, U.S.A |
| Abstract: | We are studying the young clusters Tr37 and NGC7160 in the Cep OB2 region as part of a program to understand the evolution of accretion disks at the ages of disk dissipation and planet formation. Here, we present the first identifications of low mass (spectral types K-M) members of the clusters and study the presence and characteristics of their accretion disks, finding evidences of disk evolution. Using optical photometry and spectroscopy, we have identified ～70 members in Tr37 and ～20 in NGC7160, confirming age estimates of 3 and 10 Myr respectively. Accretion rates are ～10?8 M ⊙yr?1 in Tr37. We have not found any accreting members in NGC7160, suggesting that disk accretion generally ends before the age of 10 Myr, which is consistent with the results from other populations. |
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