NOAO >   Observing Info >   Approved Programs >   2007A-0311

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Proposal Information for 2007A-0311


PI: Michelle L. Edwards, University of Florida, edwards@astro.ufl.edu
Address: Department of Astronomy, 211 Bryant Space Science Center, Gainesville, FL 32611, USA

CoI: Stephen S. Eikenberry, University of Florida
CoI: David M. Clark, University of Florida
CoI: Nick Raines, Univesity of Florida

Title: Probing the Extent and Membership of Cl 1806-20

Abstract: We propose a near-infrared spectroscopic survey of the region surrounding the Galactic star cluster 1806-20 to characterize its extent and membership. Composed of a myriad of massive stars including a Luminous Blue Variable (LBV), Wolf Rayets (WRs), supergiants and hypergiants, the known stellar population of Cl 1806-20 is reminiscent of dense Galactic star clusters like the Quintuplet, Arches, and Westerlund 1. However, the large number of stars and high crowding in the cluster core have limited previous attempts to characterize the cluster's extent. To further the exploration of Cl 1806-20, we request four nights on the KPNO 4-m with Flamingos. Using multi-object spectroscopy (MOS) we will collect spectra of 200 objects inside a 1.5\arcmin radius and establish the membership of Cl 1806-20. Newly discovered cluster members will provide us the means to probe the massive star population and test theories regarding top-heavy mass distributions. This is a resubmission of a previous proposal that was granted time but failed to yield MOS data due to instrument problems and bad weather.


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NOAO >   Observing Info >   Approved Programs >   2007A-0311

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