Lithium abundances and chromospheric activity. I - Empirical results

Details Lithium abundances and chromospheric activity. I - Empirical results Lithium abundances and chromospheric activity. I - Empirical results

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..235g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 1, 1984, p. 235-240.

Astronomy and Astrophysics

Astrophysics

56

Chromosphere, Main Sequence Stars, Stellar Activity, Abundance, Atmospheric Heating, Lithium, Pre-Main Sequence Stars, Solar Spectra, Sunspots

Scientific paper

An empirical analysis is presented of the effects of chromospheric activity on lithium abundance determinations, as deduced from high signal-to-noise, high spectral resolution solar observations of the Li I resonance doublet at 6707.8 A. In particular, solar active (plage) regions and quiet comparison regions were observed to find a maximum relative change in the Li I 6707 equivalent width of -0.53 among the limited number of solar plage observations available for this investigation. The relative weakening of the lithium resonance doublet is attributed to the increased ionization of neutral lithium due to the enhanced nonradiative heating that characterizes solar plages. The strong enhancement of the 6707 line in sunspot umbrae is confirmed and it is emphasized that the presence of stellar surface thermal inhomogeneities analogous to solar plages and sunspots can substantially alter the equivalent width of this feature in stellar spectra. Thus the effects of stellar chromospheric activity will introduce ambiguities into lithium abundance determinations that, in turn, can contribute significantly to the scatter in investigations that utilize this diagnostic.

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