English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

{Although there is considerable evidence supporting an ubiquitous magneticfield in solar/stellar photospheres, its impact in the determination ofabundances has never been quantified. In this work we investigate whether themagnetic field plays a measurable role for this kind of studies. To that end,we carry out simulations of spectral line formation in the presence of amagnetic field, and then use those profiles to derive the abundance of severalatomic species (Fe, Si, C and O) neglecting the magnetic field. In this way, wefind that the derived iron abundance can be significantly biased, withsystematic errors up to 0.1 dex. In the case of silicon, carbon and oxygentheir role is very marginal (errors smaller than 0.02 dex). We also find thatthe effect of the magnetic field strongly depends on its inclination withrespect to the observer. We show that fields that are aligned with the observerlead to an underestimation of the real abundance, whereas more inclined onesoverestimate it. In the case of a mixture of fields with different inclinationsthese effects are likely to partly cancel each other out, making the role ofthe magnetic field even less important. Finally, we derive a simple model thatcan be used to determine the suitability of a spectral line when we wish toavoid the bias introduced by the neglect of the magnetic field.

On the role of magnetic fields in abundance determinations