The laboratory analysis of Bi II and its application to the Bi-rich HgMn star HR 7775
Författare
Summary, in English
The bismuth spectrum emitted from a hollow cathode discharge has been recorded with a Fourier Transform Spectrometer (FTS). Accurate wavelengths have been determined for 104 lines, and several new energy levels have been found, while the accuracy of previously known level energies have been improved. The hyperfine structure of all observed lines has been analyzed, yielding hyperfine constants A and B for 56 levels. With the aid of the laboratory measurements the optical region spectrum of the HgMn star HR 7775 has been studied for all observable lines. The wavelengths and hfs constants established from the laboratory work have been combined with theoretical gf values to identify spectral lines and make an abundance estimation of bismuth. It has been established that bismuth is present in HR 7775 at an enhancement level of approximately 5 orders of magnitude relative to the meteoritic abundance, consistent with previous observations in the ultraviolet region of this star. Astrophysical gf values are presented for a number of lines.
Avdelning/ar
Publiceringsår
2002
Språk
Engelska
Sidor
692-703
Publikation/Tidskrift/Serie
Astronomy & Astrophysics
Volym
388
Issue
2
Fulltext
- Available as PDF - 175 kB
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Dokumenttyp
Artikel i tidskrift
Förlag
EDP Sciences
Ämne
- Astronomy, Astrophysics and Cosmology
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0004-6361