Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..780l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 780-790. Research supported by the Joint Institute
Astronomy and Astrophysics
Astronomy
12
Binary Stars, Infrared Astronomy, Radio Astronomy, Stellar Spectra, Ultraviolet Astronomy, Calcium, Emission Spectra, H Alpha Line, Iue, Light Curve, Magnesium, Microwave Spectra, Visible Spectrum
Scientific paper
HR 5110 is a close binary system (P = 2d.6) with the characteristics of an Algol system. Because the primary star is relatively cool (F2 IV) and there is no apparent emission from an accretion disk, the authors were able to detect in IUE spectra the emission of an active chromosphere and transition region of the cooler (K0 IV) secondary. The surface fluxes of the UV emission lines of the K star are similar to those of active RS CVn binaries. The line fluxes appear to vary with orbital phase and are interpreted as emission from an active region on the K star. Two large radio flares were detected. VLBI observations during one of these flares indicated that half the emission came from a region more than 4 times the binary separation.
Ayres Thomas R.
Cohen Norman L.
Feldman Paul A.
Linsky Jeffrey L.
Little Scott J.
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