Welty, D.E. and Crowther, P.A. (2010) Interstellar Ti ii in the Milky Way and Magellanic Clouds star. Monthly Notices of the Royal Astronomical Society , 404 (3). pp. 1321-1348. ISSN 0035-8711
Abstract
We discuss several sets of Ti II absorption-line data, which probe a variety of interstellar environments in our Galaxy and in the Magellanic Clouds. Comparisons of high-resolution [full width at half-maximum (FWHM) ∼ 1.3–1.5 km s−1] Ti II spectra of Galactic targets with corresponding high-resolution spectra of Na I, K I and Ca II reveal both similarities and differences in the detailed structure of the absorption-line profiles – reflecting component-to-component differences in the ionization and depletion behaviour of those species. Moderate-resolution (FWHM ∼ 3.4–4.5 km s−1) spectra of more heavily reddened Galactic stars provide more extensive information on the titanium depletion in colder, denser clouds – where more than 99.9 per cent of the Ti may be in the dust phase. Moderate-resolution (FWHM ∼ 4.5–8.7 km s−1) spectra of stars in the Magellanic Clouds suggest that the titanium depletion is generally much less severe in the Large and Small Magellanic Clouds than in our Galaxy [for a given N(Htot), E(B−V), or molecular fraction f(H2)]– providing additional evidence for differences in depletion patterns in those two lower-metallicity galaxies. We briefly discuss possible implications of these results for the interpretation of gas-phase abundances in quasi-stellar object absorption-line systems and of variations in the D/H ratio in the local Galactic interstellar medium.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2010 The Authors. Journal compilation © 2010 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Keywords: | ISM: abundances; ISM: lines and bands; galaxies: ISM; Magellanic Clouds; DAMPED LYMAN-ALPHA; ULTRAVIOLET-SPECTROSCOPIC-EXPLORER; LINE-OF-SIGHT; HIGH-RESOLUTION OBSERVATIONS; ULTRA-HIGH-RESOLUTION; LOWER GALACTIC HALO; WOLF-RAYET STARS; HUBBLE-SPACE-TELESCOPE; INTER-STELLAR TITANIUM; WARM NEUTRAL MEDIUM |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 06 Nov 2017 16:05 |
Last Modified: | 06 Nov 2017 16:05 |
Published Version: | https://doi.org/10.1111/j.1365-2966.2010.16386.x |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1111/j.1365-2966.2010.16386.x |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:123558 |