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Lego Figure holding a lego telescope. Photo

Henrik Hartman

Researcher (Leave of Absence)

Lego Figure holding a lego telescope. Photo

The FERRUM project: experimentally determined metastable lifetimes and transition probabilities for forbidden [Ti II] lines observed in eta Carinae

Author

  • Henrik Hartman
  • P Schef
  • P Lundin
  • A Ellmann
  • Sveneric Johansson
  • Hans Lundberg
  • S Mannervik
  • L O Norlin
  • D Rostohar
  • P Royen

Summary, in English

In the spectrum of an emission-line region ejected from the massive star Eta Carinae, called the strontium filament (SrF), forbidden lines from many elements, in particular [Sr II] and [Ti II], are observed. These lines are strong in this specific region and valuable for plasma diagnostics. Forbidden lines are not easily produced in laboratory light sources and the atomic parameters for these lines can thus not be measured in a straightforward way. We use a combination of laboratory and astrophysical measurements to determine transition probabilities for the [Ti II] lines. Lifetimes for metastable levels in Ti II are measured using a laser probing technique on a stored ion beam at CRYRING, MSL, Stockholm. Branching fractions from some of these levels are derived from Hubble Space Telescope/STIS spectra of the SrF. The astrophysical branching fractions are combined with the experimental lifetimes to determine absolute transition probabilities. We report lifetimes for the Ti II levels b(4)P(3/2), b(2)P(1/2), c(2)D(3/2) and c(2)D(5/2), in the range 0.29-17 s, and transition probabilities for eight parity-forbidden lines from the levels c(2)D(3/2) and c(2)D(5/2), along with uncertainty estimates.

Department/s

  • Lund Observatory - Undergoing reorganization
  • Atomic Physics

Publishing year

2005

Language

English

Pages

206-210

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

361

Issue

1

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology
  • Atom and Molecular Physics and Optics

Keywords

  • atomic data
  • stars : individual : Eta Carinae

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966