Disk Evolution Near the End of the Accretion Phase: Membership of the 5- 10 Myr-old Cluster IC 2395

Details Disk Evolution Near the End of the Accretion Phase: Membership of the 5- 10 Myr-old Cluster IC 2395 Disk Evolution Near the End of the Accretion Phase: Membership of the 5- 10 Myr-old Cluster IC 2395

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005noao.prop..492s&link_type=abstract

NOAO Proposal ID #2005B-0492

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We propose to obtain HYDRA CTIO fiber spectra of a large sample of pre-main sequence stellar candidates in the young open cluster IC 2395. We are investigating this cluster as part of an overall Spitzer GTO study of disk evolution in ~20 young clusters. IC 2395, at a distance of ~800 pc, has been poorly-studied and only recently was dated at 6+/-2 Myr old via upper main sequence fitting (Claria et al. 2003). Optical spectra are needed in order to confirm the cluster membership of photometrically-selected candidates using spectral types, radial velocities, and youth indicators such as H(alpha) emission and Li absorption. The spectral results will delineate the low-mass pre- main sequence of the cluster, from which a more accurate age determination can be made. 5-10 Myr is an important age range because it represents the end of the primordial accretion disk phase. If this age is confirmed it will be one of only 2 open clusters to be less than 1 kpc away and have an estimated age of 5-10 Myr. Thus IC 2395 is crucial for obtaining good statistics of disk properties across the full stellar mass spectrum as they dissipate and perhaps transition into debris disks. Optical spectra are crucial to confirming the nature of the measured infrared excess sources and characterizing the structure of the bona-fide disks.

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