Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Inelastic e+Mg collision data and its impact on modelling stellar and supernova spectra

    Access Status
    Open access via publisher
    Authors
    Barklem, P.
    Osorio, Y.
    Fursa, Dmitry
    Bray, Igor
    Zatsarinny, O.
    Bartschat, K.
    Jerkstrand, A.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Barklem, P. and Osorio, Y. and Fursa, D. and Bray, I. and Zatsarinny, O. and Bartschat, K. and Jerkstrand, A. 2017. Inelastic e+Mg collision data and its impact on modelling stellar and supernova spectra. Astronomy and Astrophysics. 606.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201730864
    ISSN
    0004-6361
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/57951
    Collection
    • Curtin Research Publications
    Abstract

    © ESO, 2017. Results of calculations for inelastic e+Mg effective collision strengths for the lowest 25 physical states of Mg i (up to 3s6p 1 P), and thus 300 transitions, from the convergent close-coupling (CCC) and the B-spline R-matrix (BSR) methods are presented. At temperatures of interest, ~5000 K, the results of the two calculations differ on average by only 4%, with a scatter of 27%. As the methods are independent, this suggests that the calculations provide datasets for e+Mg collisions accurate to this level. Comparison with the commonly used dataset compiled by Mauas et al. (1988, ApJ, 330, 1008), covering 25 transitions among 12 states, suggests the Mauas et al. data are on average ~57% too low, and with a very large scatter of a factor of ~6.5. In particular the collision strength for the transition corresponding to the Mg i intercombination line at 457 nm is significantly underestimated by Mauas et al., which has consequences for models that employ this dataset. In giant stars the new data leads to a stronger line compared to previous non-LTE calculations, and thus a reduction in the non-LTE abundance correction by ~0.1 dex (~25%). A non-LTE calculation in a supernova ejecta model shows this line becomes significantly stronger, by a factor of around two, alleviating the discrepancy where the 457 nm line in typical models with Mg/O ratios close to solar tended to be too weak compared to observations.

    Related items

    Showing items related by title, author, creator and subject.

    • Plasma pressure broadening for few-electron emitters including strong electron collisions within a quantum-statistical theory
      Lorenzen, S.; Omar, B.; Zammit, Mark; Fursa, Dmitry; Bray, Igor (2014)
      To apply spectroscopy as a diagnostic tool for dense plasmas, a theoretical approach to pressure broadening is indispensable. Here, a quantum-statistical theory is used to calculate spectral line shapes of few-electron ...
    • Spectral Line Shapes of He I Line 3889 Å
      Omar, B.; González, M.; Gigosos, M.; Ramazanov, T.; Jelbuldina, M.; Dzhumagulova, K.; Zammit, Mark; Fursa, Dmitry; Bray, Igor (2014)
      Spectral line shapes of neutral helium 3889 Å(23S–33P) transition line are calculated by using several theoretical methods. The electronic contribution to the line broadening is calculated from quantum statistical ...
    • Spectral Line Shapes of He I Line 3889 angstrom
      Omar, B.; Gonzalez, M.; Gigosos, M.; Ramazanov, T.; Jelbuldina, M.; Dzhumagulova, K.; Zammit, Mark; Fursa, Dmitry; Bray, Igor (2014)
      Spectral line shapes of neutral helium 3889 Å(23S–33P) transition line are calculated by using several theoretical methods. The electronic contribution to the line broadening is calculated from quantum statistical ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.