NOAO >   Observing Info >   Approved Programs >   2014A-0250

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Proposal Information for 2014A-0250


PI: M. Virginia McSwain, Lehigh University, mcswain@lehigh.edu
Address: Department of Physics, 16 Memorial Drive East, Bethlehem, PA 18015, USA

CoI: Matthew S. Povich, Cal Poly Pomona
CoI: Michael J. Alexander, Lehigh University

Title: They Might Be Giants: Physical Properties of Newly Discovered OB Stars in Carina

Abstract: We propose one night of observations with the AAOmega instrument on the Anglo-Australian Telescope to obtain spectra of a large sample of newly discovered massive stars in the Great Nebula in Carina, the nearest analog of extragalactic starburst regions. We recently completed a spectroscopic survey of the region to classify OB candidates, which resulted in the discovery of 16 new OB stars. With additional wavelength coverage available, we will employ spectral modeling and broadband optical-IR SED fitting to derive physical properties (e.g. temperature, bolometric luminosity, surface gravity, and mass) of the known OB stars and our newly-confirmed candidate OB stars with high (\ga100) signal-to-noise spectra. These results will be used to calibrate SED models against broadband photometry to constrain mass-loss rates of hot stars in more obscured regions where high-quality spectra cannot be obtained. Determining the physical properties of these OB stars is critical to refining the census of the massive stellar population in Carina, impacting our understanding of the energetics and stellar initial mass function in this oft-studied region.


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NOAO >   Observing Info >   Approved Programs >   2014A-0250

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