𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Europium and lanthanum in sunspot and in the undisturbed photosphere

✍ Scribed by G. Bachmann; K. Pflug; J. Staude

Publisher
Springer
Year
1970
Tongue
English
Weight
364 KB
Volume
15
Category
Article
ISSN
0038-0938

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✦ Synopsis

Line profiles of Euli 24129.7 ~ and LalI 24086.7 A, were observed photoelectrically and photographically in the photosphere and within sunspots and after correction were compared with calculated profiles. The observed large hyperfine structure broadening and isotope shift of 24129.7 A_ confirm the Eu origin of this line and suggest a larger Eu abundance than that recently published by Grevesse and Blanquet (1969). The line profiles within the spot may be well represented by means of the spot model of H6noux (1969), while older spot models are not able to do it. An abundance difference between spot and photosphere has not been observed.

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