The impact of improved Stark-broadening widths on the modeling of double-ionized chromium lines in hot stars
- Stellar atmosphere modeling and chemical abundance determinations require the knowledge of spectral line shapes. Spectral lines of chromium in various ionization stages are common in stellar spectra but detailed data on Stark broadening for them is scarce. Recently we reported on the first calculations of Stark widths for several 4s-4p transitions of double-ionized chromium, employing the Modified Semi-Empirical approach (MSE). In this work we present applications of the data to spectrum synthesis of Cr III lines in the ultraviolet region of hot stars. The Atlas9 model atmosphere code and the line-formation code Surface were used with the assumption of local thermodynamic equilibrium. The improvements of adopting the MSE broadening tables instead of approximate Stark broadening coefficients are investigated for a total of 56 Cr III lines visible in HST/STIS spectra of the B3 subgiant star Iota Herculis and the subdwarf B-star Feige 66.
| Author details: | Abhishek Chougule, Norbert PrzybillaORCiDGND, Milan S. DimitrijevicORCiDGND, Veronika SchaffenrothORCiDGND |
|---|---|
| DOI: | https://doi.org/10.31577/caosp.2020.50.1.139 |
| ISSN: | 1335-1842 |
| ISSN: | 1336-0337 |
| Title of parent work (English): | Contributions of the Astronomical Observatory Skalnate Pleso = Práce Astronomického Observatória na Skalnatom Plese |
| Publisher: | Astronomický Ústav SAV |
| Place of publishing: | Tatranská Lomnica |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2020/01/15 |
| Publication year: | 2020 |
| Release date: | 2023/05/15 |
| Tag: | line: profiles; stars: abundances |
| Volume: | 50 |
| Issue: | 1 |
| Number of pages: | 8 |
| First page: | 139 |
| Last Page: | 146 |
| Funding institution: | 12th Serbian Conference on Spectral Line Shapes in Astrophysics; University of Innsbruck from the Promotion of Young Researchers Program; Deutsches Zentrum fr Luft- und Raumfahrt [50 OR 1110] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
| Peer review: | Referiert |
| Publishing method: | Open Access / Bronze Open-Access |
| License (German): |  CC-BY - Namensnennung 4.0 International |
