Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0020393d&link_type=abstract
Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States
Astronomy and Astrophysics
Astrophysics
Extreme Ultraviolet Radiation, Binary Stars, Light Curve, Ultraviolet Spectra, Stellar Flares, Extreme Ultraviolet Explorer Satellite, Temperature Distribution
Scientific paper
Extreme ultraviolet spectra (lambda lambda 70-740) and light curves (lambda lambda 75-175) of the spectroscopic binary system lambda And (HD 222107), were obtained with the Extreme Ultraviolet Explorer satellite (EUVE) in July and August 1997. Two flares were detected during the observations which spanned 15 days, or almost three-quarters of the orbital period of 20.5 days. The Emission Measure Distribution (EMD) of lambda And derived from a line-based analysis, shows an increasing slope with the temperature from 3.1x106 K through 2.0x107 K, as well as a remarkable 'bump' around Te approx. equals 106.9 K. During the flares small changes were detected in both the general slope of the EMD and the height of the bump, but the bump remained very stable in its temperature. Electron densities of Ne approx. equals 1012.7 cm-3 are indicated at temperatures of 107 K using Fe XXI and Fe XXII emission features.
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