STELLAR CORONAE, SOLAR FLARES: A DETAILED COMPARISON OF [sigma] GEM, HR 1099, AND THE SUN IN HIGH-RESOLUTION X-RAYS

The Chandra High Energy Transmission Grating Spectrometer (HETG) spectra of the coronally active binary stars [sigma] Gem and HR1099 are among the highest fluence observations for such systems taken at high spectral resolution in X-rays with this instrument. This allows us to compare their propertie...

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Bibliographic Details
Published in:The Astrophysical journal 2013-05, Vol.768 (2), p.1-15
Main Authors: Huenemoerder, David P, Phillips, Kenneth J H, Sylwester, Janusz, Sylwester, Barbara
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BINARY STARS
DISTRIBUTION
EMISSION
EQUILIBRIUM PLASMA
FRACTIONATION
Gratings (spectra)
IONIZATION POTENTIAL
POWER TRANSMISSION
RESOLUTION
SOLAR CORONA
SOLAR FLARES
SPECTRA
Spectral emissivity
SPECTROMETERS
SUN
TEMPERATURE DISTRIBUTION
WAVELENGTHS
X RADIATION
X-rays
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Summary:The Chandra High Energy Transmission Grating Spectrometer (HETG) spectra of the coronally active binary stars [sigma] Gem and HR1099 are among the highest fluence observations for such systems taken at high spectral resolution in X-rays with this instrument. This allows us to compare their properties in detail to solar flare spectra obtained with the Russian CORONAS-F spacecraft's RESIK instrument at similar resolution in an overlapping bandpass. Here we emphasize the detailed comparisons of the 3.3-6.1A region (including emission from highly ionized S, Si, Ar, and K) from solar flare spectra to the corresponding [sigma] Gem and HR1099 spectra. The measurements provide new comparisons of solar and stellar coronal abundances, especially at the lowest first ionization potential (FIP) values. The low FIP elements do not show enhancement in the stellar coronae as they do in the Sun, except perhaps for K in [sigma] Gem. While [sigma] Gem and HR1099 differ in their emission measure distributions, they have very similar elemental abundances.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/768/2/135