NOAO >   Observing Info >   Approved Programs >   2009A-0258

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Proposal Information for 2009A-0258


PI: David Kaplan, UCSB, dkaplan@kitp.ucsb.edu
Address: Physics Department, KITP, Kohn Hall, Santa Barbara, CA 93106-4030, United States

CoI: Bettina Posselt, SAO
CoI: Gemma Anderson, U. Sydney
CoI: Jon Mauerhan, IPAC
CoI: Pat Slane, SAO
CoI: Bryan Gaensler, U. Sydney

Title: Chicago: Chasing the Identification of ASCA Galactic Objects --- Near-IR Spectroscopy

Abstract: Most bright X-ray sources are well-known objects, while AGN, CVs and active stars dominate the faint population. However, many X-ray sources at low Galactic latitudes lie between these two regimes, comprised of sources such as hot stars, massive accreting binaries and young neutron stars. To understand these populations, we are using \textitChandra to localize all ~ 100 unresolved X-ray sources in the \textitASCA Galactic Plane Survey and following up those X-ray sources with an intensive multi-wavelength (radio to TeV (gamma)-rays) observational campaign. Many objects have stellar counterparts, either isolated or binary, and many of those are among the most interesting types of massive/evolved stars such as Wolf Rayet stars, colliding wind binaries, and symbiotic binaries. For such objects, optical and infrared spectroscopy to determine stellar types, binarity, and wind parameters is crucial. Here we request OSIRIS spectroscopy of 9 objects that, while too faint for optical spectroscopy, are well suited to the near- infrared. The resulting identifications will allow us to derive the lifetimes, birth-rates and spatial distributions of these young and energetic populations.


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