Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..262w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 262-274.
Astronomy and Astrophysics
Astrophysics
99
Eclipsing Binary Stars, Stellar Coronas, Stellar Flares, X Ray Binaries, Bremsstrahlung, Exosat Satellite, K Stars, Light Curve, Plasma Cooling, Pulse Amplitude
Scientific paper
X-ray emission from the Algol system is believed to originate in a corona associated with the K star. The authors have used the EXOSAT Observatory to make a 35 hr continuous observation centered on the occultation of the K star by the B star primary. The spectrum of the quiescent emission in the 1 - 10 keV band gives a temperature of 2.5×107K. This spectrum, extrapolated to lower energies, can account for more than 80% of the observed count rate. No obvious X-ray eclipse was seen. An X-ray flare was detected with a rise time of ≡1700 s and an exponential decay of ≡7000 s. The 0.1 - 10 keV peak luminosity was 1.4×1031ergs s-1. The peak temperature was 6×107K, with an iron K line confirming the thermal character of the emission.
Culhane Leonard J.
Kahn Sophia
Kellett Barry J.
Kuijpers Jan
Parmar Arvind N.
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