A STUDY OF THE λ3984 FEATURE IN THE MERCURY-MANGANESE STARS

A STUDY OF THE λ3984 FEATURE IN THE MERCURY-MANGANESE STARS

The isotopic shift of the Hg ii λ3984 line is examined in the spectra of a number of strong mercury-manganese stars; the shift cannot be explained by line blending with lines of other elements in these stars, but represents real isotopic variations. An astrophysical log gf value of — 1.8 is derived...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 1975-08, Vol.87 (518), p.513-521
Hauptverfasser: COWLEY, CHARLES R., AIKMAN, G. C. L.
Format: Artikel
Sprache:eng
Schlagworte:
Astrophysics
B stars
Effective temperature
Isotopes
Mathematical tables
Mercury
Stars
Stellar spectra
Stellar spectral lines
Wavelengths
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Zusammenfassung:The isotopic shift of the Hg ii λ3984 line is examined in the spectra of a number of strong mercury-manganese stars; the shift cannot be explained by line blending with lines of other elements in these stars, but represents real isotopic variations. An astrophysical log gf value of — 1.8 is derived for λ3984, based on the Hg i λ3984 line strength in ι CrB and HR 1800. Elemental and (in some cases) isotopic abundances of Hg are derived using a spectrum synthesis technique; overabundances of up to 5.4 dex over the solar system mercury abundance are found; the maximum overabundances may be temperature dependent.
ISSN:0004-6280
1538-3873