Coronal Metallicities of Active Binaries

Details Coronal Metallicities of Active Binaries Coronal Metallicities of Active Binaries

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.8201k&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #82.01; Bulletin of the American Astronomical Society, Vol. 30, p.1155

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We analyze EUV and X-ray data on a sample of X-ray active binary stars to determine coronal abundances. EUVE spectrometer data are used to obtain line fluxes, which are then used to determine Differential Emission Measures (DEMs). The continuum emission predicted for these DEMs (constrained at high temperatures by measurements in the X-ray regime where available) are then compared with EUVE/DS counts to derive coronal metallicities. These measurements indicate whether the coronae on these stars are metal deficient (the ``MAD Syndrome'') or subject to the FIP-effect (low First Ionization Potential elements have enhanced abundances relative to the photospheres).

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