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• W2139146760 endingPage "926" @default.
• W2139146760 startingPage "911" @default.
• W2139146760 abstract "We present an analysis of ten cool stars (Algol, Capella, Procyon, ϵ Eri, α Cen A&B, UX Ari, AD Leo, YY Gem, and HR 1099) observed with the Low Energy Transmission Grating Spectrometer (LETGS) on board the Chandra X-ray Observatory. This sample contains all cools stars observed with the LETGS presently available to us with integration times sufficiently long to warrant a meaningful spectral analysis. Our sample comprises inactive, moderately active, and hyperactive stars and samples the bulk part of activity levels encountered in coronal X-ray sources. We use the LETGS spectra to carry out density and temperature diagnostics with an emphasis on the H-like and the He-like ions. We find a correlation between line flux ratios of the Lyα and He-like resonance lines with the mean X-ray surface flux. We determine densities using the He-like triplets. For all stars we find no significant deviations from the low-density limit for the ions of Ne, Mg, and Si, while the measured line ratios for the ions of C, N, and O do show evidence for departures from the low-density limit in the active stars, but not in the inactive stars. Best measurements can be made for the O vii triplet where we find significant deviations from the low-density limit for the stars Algol, Procyon, YY Gem, ϵ Eri, and HR 1099. We discuss the influence of radiation fields on the interpretation of the He-like triplet line ratios in the low-Z ions, which is relevant for Algol, and the influence of dielectronic satellite lines, which is relevant for Procyon. For the active stars YY Gem, ϵ Eri, and HR 1099 the low ratios can unambiguously be attributed to high densties in the range 1– cm-3 at O vii temperatures. We find our LETGS spectra to be an extremely useful tool for plasma diagnostics of stellar coronae." @default.
• W2139146760 created "2016-06-24" @default.
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• W2139146760 date "2002-10-21" @default.
• W2139146760 modified "2023-10-02" @default.
• W2139146760 title "Coronal density diagnostics with Helium-like triplets: CHANDRA–LETGS observations of Algol, Capella, Procyon,<i>ϵ</i> Eri,<i>α</i> Cen A&B, UX Ari, AD Leo, YY Gem, and HR 1099" @default.
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• W2139146760 doi "https://doi.org/10.1051/0004-6361:20021146" @default.
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