... For Gen-X sensitivities and modest stellar flares, we estimate that 6.4 keV line equivalent widths of 1 eV are expected and observable for source heights < 103 km above the photosphere. ...
... Finally, determining whether or not Fe is depleted in the corona relative to the photosphere would be an important step toward understanding the derived abundances, since it could be possible that at least some of the obser ved Ne and Ar excesses relative ...
... This particular line was observed in solar spectra A and for some time was thought to result from inner-shell ionization by coronal X-rays and subsequent L-shell fluorescence of neutral and once ionized iron in the photosphere, as described by Drake et al ...
... Finally, determining whether or not Fe is depleted in the corona relative to the photosphere would be an important step toward understanding the derived abundances, since it could be possible that at least some of the observed Ne and Ar ex cesses ...
... Shih et al. 2010), consistent with an ultraluminous state spectrum where the soft component (either the outer disk, or perhaps more plausibly the photosphere at the base of a radiatively driven outflow) dominates; see Gladstone et al. (2009) for examples ...
... stars with different levels of magnetic field up to 1015 Ghave now been observed with high-resolution X-ray spectrometers and none have so far shown absorption features that are intrinsic to the stellar photosphere (e.g., RX J0720.4Р3125, Paerels et al ...
... stars with di#erent levels of magnetic field up to 10 15 G have now been observed with highresolution Xray spectrome ters and none have so far shown absorption features that are intrinsic to the stellar photosphere (e.g., RX J0720.4#3125, Paerels et al ...