Something new under the Sun: A magnetically driven CH/CN anti-correlation
Y. Momany, L. Monaco, S. Villanova, S. Zaggia, I. Saviane, L. Girardi, G. Volpato, G. Costa, N. R. Landin, I. Yegorova, M. Montalto, M. Dima, F. R. Herpich, F. Almeida-Fernandes
astro-ph.SR
Submitted: 2026-08-03
Comments: 19 pages, 7 figures. A&A, in press. Abstract shortened for arXiv
DOI: 10.1051/0004-6361/202661207
License: http://creativecommons.org/licenses/by-nc-sa/4.0/
The gist: Spectroscopic monitoring surveys have shown that the magnetic cycle alters the photospheric structure of the Sun, perturbing the formation of molecular lines.
Terminology
Abstract
Spectroscopic monitoring surveys have shown that the magnetic cycle alters the photospheric structure of the Sun, perturbing the formation of molecular lines. In parallel, the study of Globular Clusters has remained centred on the multiple stellar populations conundrum, a phenomenon defined-most notably-by the anti-correlation between CH and CN molecular bands, serving to distinguish between first-population and second-population stars. We systematically monitored the behaviour of the CH and CN molecular bands as a function of the solar magnetic cycle. We demonstrate that the disc-integrated solar spectrum exhibits a distinct CH/CN anti-correlation driven by the magnetic cycle. Our results suggest that the spectroscopic and photometric anomalies defining the multiple populations conundrum may be physically linked to a differential spectral response to varying degrees of surface magnetic coverage.
Sources
- Hints of enhanced magnetic activity after the intermediate rotation period gap as traced by the chromospheric Ca ii infrared triplet
- A New Catalog of Globular Clusters in the Milky Way
- Effect of surface magnetic fields on limb darkening in main-sequence stars
- Globular Clusters in the Time of the JWST. I. Survey Design and First Results on Multiple Populations and Beyond
- Six decades of TIGRE and Mount Wilson chromospheric monitoring in the H and K lines: The quest for an understanding of solar-type activity
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