A Proper-Motion Search for New Low-Mass Members of Nearby Clusters

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present new low-mass (m <= 0.1 Msol) members of six nearby (d <= 300 pc) clusters using a combination of proper-motion and color criteria. CFHT imaging data from multiple epochs spanning roughly six years have been analyzed by the Pan-STARRS Image Processing Pipeline (IPP) in order to obtain highly accurate proper-motion measurements. These data are combined with 2MASS detections in order to construct (i-J) colors and obtain new member candidates. Spectroscopic follow-up from the IRTF and Subaru facilities has allowed us to classify our candidates as members or nonmembers based on overall SED shape as well as previously-developed spectral indices sensitive to temperature and gravity. Additional verification of members from the youngest clusters is provided by H-alpha detections indicative of ongoing accretion. In the case of more ambiguous candidates, a dynamical analysis was performed using a Galactic field population model to determine the likelihood of candidates being old dwarf interlopers along the line-of-sight. This method of combining kinematic and photometric criteria to identify potential cluster members will yield impressive results once the Pan-STARRS 3-Pi Survey begins in late 2009, as it will be regularly imaging 75% of the total sky over multiple years. This work has been made possible by a generous grant from the National Science Foundation.

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