The transition region structure of AR Lacertae

Details The transition region structure of AR Lacertae The transition region structure of AR Lacertae

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..369j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 1, 1991, p. 369-376.

Astronomy and Astrophysics

Astronomy

2

Eclipsing Binary Stars, High Temperature Plasmas, Stellar Structure, Astronomical Photography, Stellar Atmospheres, Ultraviolet Astronomy, X Ray Astronomy

Scientific paper

Recent X-ray and ultraviolet observations of the eclipsing RS CVn binary, AR Lac, are reviewed. Constraints on the coronal geometry imply a mean pressure of greater than 17 dyn/sq cm for plasma with a temperature greater than 10 exp 6 K, whereas the mean transition region pressure for cooler plasma at a temperature of about 100,000 K is found to be 0.5 dyn/sq cm. In this paper it is shown that this pressure discrepancy is inconsistent with a model of the outer atmosphere in which the transition region is situated solely at the base of coronal loops, but rather, implies that a large volume of lower pressure cool plasma must exist somewhere in the atmosphere which may be responsible for the majority of the transition region emission. The location and origin of this component are discussed.

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