Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..710o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 2, p. 710-723.
Astronomy and Astrophysics
Astronomy
44
Binary Stars, Light Curve, Stellar Coronas, X Ray Spectra, Rosat Mission, Spectrum Analysis, Stellar Models, X Ray Astronomy
Scientific paper
X-ray observations of the eclipsing RS CVn binary AR Lac covering both primary and secondary minimum, obtained with the position sensitive proportional counter (PSPC) on-board ROSAT, are presented. The X-ray light curves clearly show a deep primary eclipse in all three PSPC spectral bandpasses covering the bands 0.1-0.28 keV, 0.4-1.1 keV, and 1.1-2.4 keV. A shallow secondary minimum occurring before phase 0.5 is seen in the total light curve. Phase-dependent spectral analysis is performed both with a two-temperature model as well as a hydrostatic loop model. During primary eclipse the emission measures of the low- and the high-temperature component drop, while the derived coronal temperatures show no orbital variation. The mean temperature values are 3 x 10 exp 6 K and 14 x 10 exp 6 K, respectively; in the context of the hydrostatic loop model, we find peak loop temperatures of 3.5 x 10 exp 7 K. In order to localize the X-ray emitting regions on the stellar surfaces, a coronal emission region modeling is performed. Two best-fit models are obtained; both models require one prominent coronal feature on each star, a compact structure on the G star, and a more extended structure associated with the K star.
Kuerster Martin
Ottmann Renate
Schmitt Juergen H. M. M.
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