The solar abundance of manganese

✍ Scribed by D. E. Blackwell; B. S. Collins; A. D. Petford

• Publisher: Springer
• Year: 1972
• Tongue: English
• Weight: 105 KB
• Volume: 23
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00148092

✦ Synopsis

A previous paper (Blackwell and Collins, 1972) discusses the use of a new improved furnace (Collins et al., 1971) in conjunction with low-noise spectrometers (Blackwell et al., 1967) for the measurement of relative oscillator strengths. The new experimental arrangement offers several important advantages over that originally used by King and King (1935), who pioneered the technique, and some preliminary results for a few lines of Mnl are presented by Blackwell and Collins. The apparatus will be improved later when funds permit, and more accurate data obtained, but it is of interest at this stage to use these preliminary data for a derivation of the solar abundance of manganese.

In these experiments the oscillator strengths have been measured by successive comparisons of absorption lines at increasing furnace temperatures, beginning with the violet resonance lines at 4030.76, 4033.07 and 4034.49, through the green intercombination lines at 5394.67 and 5432.55 and ending with the 5516.77 line. From the 19 lines in this sequence we have selected 5 lines that are suitable for solar analysis: these are listed in Table I, together with their oscillator strengths. The equivalent widths of the solar lines given in this table have been measured using the solar installation at the Gornergrat, Switzerland (Blackwell et al., 1969)