Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934905j&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.05
Astronomy and Astrophysics
Astronomy
Scientific paper
Analysis of chemical abundances and dust composition in the interstellar medium (ISM) suffers from spectroscopic information that is either incomplete or ambiguous. An improved analysis of ISM abundances and dust composition would involve spectroscopic information from multiple wavebands. We have obtained 13 orbits of Hubble Space Telescope/Cosmic Origins Spectrograph ultraviolet (UV) spectra of two low-mass X-ray binaries (LMXBs). We have also obtained optical spectra from the Hobby-Eberly Telescope (HET) and Harlan J. Smith Telescope (HJST) in order to assess the velocity structure of these lines of sight. These spectra allow us to analyze the gas-phase ISM column densities of H, O, and Fe toward these LMXBs. We then discuss the column density results in terms of existing Chandra X-Ray Observatory (CXO) results for these targets. The CXO data allow for the measurement of total gas+dust column densities of O, Ne, and Fe, allowing the combined data set to measure the total, phase-independent abundances of O, Ne, and Fe relative to H, and also separate the gas- and dust-phase components of O and Fe. This is a unique, direct measurement of the dust-phase composition of the ISM, which we discuss in the context of our current understanding of ISM abundances and dust models.
Jensen Adam G.
Schulz Norbert
Sonneborn George
Valencic Lynne
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