Query : 2000A&A...363..815N

2000A&A...363..815N - Astronomy and Astrophysics, volume 363, 815-820 (2000/11-2)

Analysis of the hyperfine and isotopic structure of Ga II in the optical spectrum of κ Cnc and HR 7775.


Abstract (from CDS):

Spectra of the HgMn stars κ Cnc and HR 7775 have been analyzed, under the assumption of local thermodynamic equilibrium (LTE), with respect to the abundance and isotopic mixture of gallium. The primary purpose of the investigation was to level the contradictory results obtained using spectral lines in different spectral regions (Smith, 1996A&A...305..902S). The analysis has been performed by Ga II lines in the optical region including hyperfine and isotopic components from new Fourier Transform Spectrometer measurements (Karlsson & Litzen, 2000, J. Phys. B., in press). Gallium has, for both stars, been determined to be overabundant by two orders of magnitude compared to the sun, using oscillator strengths derived by Ryabchikova & Smirnov. The difference in abundance obtained using spectral lines in the UV and the visual spectral region is unexplainable by accounting for hyperfine and isotopic structure. Astrophysical loggf values have been determined for the Ga II 5p - 5d transitions at 5360, 5363 and 5421Å.

Abstract Copyright:

Journal keyword(s): atomic processes - line: profiles - stars: abundances - stars: chemically peculiar - stars: individual: κ Cnc, HR 7775

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 * kap Cnc a2* 09 07 44.8095541176 +10 40 05.519586828 4.70 5.13 5.24     B8IIImnp 356 0
2 * bet02 Cap ** 20 20 46.5478935096 -14 47 05.603724348   6.08 6.10     B9/A0III/IV 137 0

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