The effects of stellar surface activity on the strength of the lithium 6708 A line

Details The effects of stellar surface activity on the strength of the lithium 6708 A line The effects of stellar surface activity on the strength of the lithium 6708 A line

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..145p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 145-154.

Astronomy and Astrophysics

Astrophysics

43

Line Spectra, Lithium, Metallicity, Stellar Activity, Stellar Structure, Stellar Atmospheres, Stellar Composition

Scientific paper

We have investigated the effects of stellar surface activity on the strength of the Li I 6708 A line both observationally, by searching for rotational modulation of the Li line in spotted stars, and theoretically, by means of spectrum synthesis simulations. We have monitored nearly simultaneously four spotted stars in the Li I line and in broad-band multi-color photometry, finding no significant variations of the Li equivalent width (at levels as low as a few percent) in spite of the photometric variations, indicative of spots, observed at the same time. We show by means of computer simulations that the effects of surface activity on the Li line, though present, may be less pronounced than what had previously been suggested on the basis of the solar analogy and of the strong enhancement of the Li line in sunspots. We show that the lack of significant rotational modulation of the Li line in our stars is not inconsistent with the spot coverage factors inferred from the photometric variations. We also argue that large cool spots cannot be a viable explanation for the anomalously strong Li line sometimes observed in evolved RS CVn binaries and other spotted stars.

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