Coronal Element Abundances in the G8 V Star XI Boo A

Details Coronal Element Abundances in the G8 V Star XI Boo A Coronal Element Abundances in the G8 V Star XI Boo A

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.0905l&link_type=abstract

American Astronomical Society, HEAD meeting #4, #09.05; Bulletin of the American Astronomical Society, Vol. 31, p.706

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a detailed analysis of a deep EUVE exposure (270 ks) of the G8 V star xi Boo A. We evaluate electron densities from line ratios in Fe X, Fe XII, Fe XIII, and Fe XIV, and use the intensities of lines from ions Fe IX - XXII to establish the emission measure distribution. We also observe and measure emission in lines from Ne VII, Mg VII - IX, Si VII, VIII, X, XII, S XII - XIV, Ar XV, XVI, Ca XIV - XVII, and Ni XVII, XVIII, from which we derive relative abundances in the corona of xi Boo A. We find very strong evidence for the FIP (First Ionization Potential) effect, in that the abundances of low FIP elements Mg, Si, Ca, Fe, and Ni appear to be enhanced by a factor of about 4 over those of the high FIP elements S and Ar, relative to their photospheric values. Thus xi Boo A joins alpha Cen B (K2 V) and possibly epsilon Eri (K2 V) in showing similar coronal abundance anomalies to those observed in the Sun, in contrast to Procyon (F5 IV) whose corona appears to have similar composition to its photosphere.

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