| Issue |
A&A
Volume 672, April 2023
|
|
|---|---|---|
| Article Number | A197 | |
| Number of page(s) | 7 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361/202245394 | |
| Published online | 21 April 2023 | |
Experimental oscillator strengths of Al I lines for near-infrared astrophysical spectroscopy
1
Lund Observatory, Division of Astrophysics, Department of Physics,
Sölvegatan 27,
Box 43,
221 00
Lund, Sweden
2
Faculty of Technology and Society, Department of Material Science and Applied Mathematics, Malmö University,
205 06
Malmö, Sweden
e-mail: madeleine.burheim@mau.se; henrik.hartman@mau.se; hampus.nilsson@mau.se
Received:
7
November
2022
Accepted:
23
February
2023
Context. Elemental abundances can be determined from stellar spectra, making it possible to study galactic formation and evolution. Accurate atomic data is essential for the reliable interpretation and modeling of astrophysical spectra. In this work, we perform laboratory studies on neutral aluminium. This element is found, for example, in young, massive stars and it is a key element for tracing ongoing nucleosynthesis throughout the Galaxy. The near-infrared (NIR) wavelength region is of particular importance, since extinction in this region is lower than for optical wavelengths. This makes the NIR wavelength region a better probe for highly obscured regions, such as those located close to the Galactic center.
Aims. We investigate the spectrum of neutral aluminium with the aim to provide oscillator strengths (f-values) of improved accuracy for lines in the NIR and optical regions (670–4200 nm).
Methods. Measurements of high-resolution spectra were performed using a Fourier transform spectrometer and a hollow cathode discharge lamp. The f-values were derived from experimental line intensities combined with published radiative lifetimes.
Results. We report oscillator strengths for 12 lines in the NIR and optical spectral regions, with an accuracy between 2 and 11%, as well as branching fractions for an additional 16 lines.
Key words: atomic data / methods: laboratory: atomic / techniques: spectroscopic
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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