Kiselman, D; Pereira, Tiago; Gustafsson, Bengt; Asplund, Martin; Melendez, Jorge; Langhans, K
Context. In studies of the solar spectrum compared to spectra of solar twin stars, it has been found that the chemical composition of the Sun seems to depart systematically from those of the twins. One possible explanation could be that the effect is caused by the special aspect angle of the Sun when observed from Earth compared with the aspect angles of the twins. This means that a latitude dependence of the solar spectrum, even with the heliocentric angle constant, could lead to the observed...[Show more]
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